Sylvain Jeaugey
6aae379278
Network user buffer support for collectives * Leverage user buffer registration to achieve zero-copy inter-node communications for Ring, NVLS and Collnet Add RAS subsystem * Create a RAS thread keeping track of all NCCL communicators. * Add a ncclras tool contacting the RAS thread and getting a report. Add fp8 support * Add support for e5m2 and e4m3 8-bit floating point operations. * Use Tree/PAT algorithms when possible for better numerical stability. Add NIC fusion * Add a NET API to ask the network plugin to fuse a set of interfaces together. * Fuse multiple NICs under the same PCI switch as a single, larger NIC. Socket connection failure retry * Retry in case of socket connection failure (unreachable host) * Avoid "Software caused connection abort" errors on retries QP connection failure retry * Retry in case of IB QP connection failure during ibv_modify_qp. NET API improvements * Allow plugins to force a flush in case data and completion ordering is not guaranteed. * Indicate when completion is not needed (e.g. for the LL128 protocol), allowing plugins to skip generating a completion. * Allow for full offload of allgather operations when using one GPU per node. NCCL_ALGO/NCCL_PROTO strict enforcement * Extend NCCL_ALGO/NCCL_PROTO syntax to be able to specify ALGO/PROTO filters for each collective operation. * Strictly enforce the ALGO/PROTO filters, no longer fall back on the ring algorithm when the filtering leaves no option and error out instead. Enable CUMEM host allocations * Use cumem functions for host memory allocation by default. Improved profiler plugin API * Avoid dependencies with NCCL includes. * Add information on whether the buffer is registered or not Adjust PAT tuning * Improve transition between PAT and ring at scale. Fix hangs when running with different CPU architectures * Detect when we use a mix of GPU architectures * Ensure Algo/Proto decisions are made based on that unified state. Fix FD leak in UDS * Fix a leak when mapping buffers intra-node with cumem IPCs. Fix crash when mixing buffer registration and graph buffer registration. * Separate local and graph registration to avoid crashes when we free buffers. Fix user buffer registration with dmabuf * Make ncclSend/ncclRecv communication with buffer registration functional on network plugins relying on dmabuf for buffer registration. Fix crash in IB code caused by uninitialized fields. Fix non-blocking ncclSend/ncclRecv * Fix case where ncclSend/ncclRecv would return ncclSuccess in non-blocking mode even though the operation was not enqueued onto the stream. * Issue #1495 Various compiler tweaks and fixes * PR #758 Fix typo in ncclTopoPrintGraph * Issue #1468
1070 строки
48 KiB
C++
1070 строки
48 KiB
C++
/*************************************************************************
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* Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
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*
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* See LICENSE.txt for license information
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************************************************************************/
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#include "network/unpack/unpack.h"
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#include <cassert>
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enum primsMode {
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primsModeDefault = 0,
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primsModePatRs = 1,
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primsModePatAg = 2
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};
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template<typename T, typename RedOp, typename Fan, int Direct,
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int SlicePerChunk, int StepPerSlice, int Unroll, int P2p, int MultimemSrcs, int MultimemDsts, bool isNetOffload>
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class Primitives<
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T, RedOp, Fan, Direct, ProtoSimple<SlicePerChunk, StepPerSlice, Unroll, MultimemSrcs, MultimemDsts>, P2p, isNetOffload
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> {
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static constexpr int MaxRecv = Fan::MaxRecv, MaxSend = Fan::MaxSend;
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static constexpr int Input=0, Output=1;
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static constexpr int RoleInput = 0x01,
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RoleOutput = 0x02,
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RoleWaitRecv = 0x04,
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RoleWaitSend = 0x08,
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RolePostSend = 0x10,
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RolePostRecv = 0x20,
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Aborted = 0x40,
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NetRegMode = 0x80,
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ConnFifoEnabled = 0x100,
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DirectWrite = 0x200,
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DirectRead = 0x400,
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PatMode = 0x800,
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NvlsMinPolling = 0x1000,
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NetDeviceUnpack = 0x2000,
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AnyNetDeviceUnpack = 0x4000;
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const int tid, tidInBlock;
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const int nthreads;
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int nworkers;
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const int stepSize;
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Fan fan;
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int index; // Peer index I'm responsible for
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int flags;
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int group;
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uint64_t step;
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struct ncclConnInfo* conn = NULL;
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struct ncclConnFifo* connFifo = NULL;
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T* connEltsFifo;
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T* directBuff = NULL;
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uint64_t *connStepPtr;
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uint64_t connStepCache; // Cache last seen value of (*connStepPtr)
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int connStepSize; // Connection step size
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void* netDeviceHandle;
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uint64_t accSize; // Accumulated size. Used by PAT operations
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// Don't use barrier 0 as it's used by the final sync
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__device__ void barrier() {
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if (nthreads == WARP_SIZE) __syncwarp();
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else {
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int bar = 15-group;
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barrier_sync(bar, nthreads);
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}
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}
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__device__ void subBarrier() {
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if (nworkers == WARP_SIZE) __syncwarp();
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else {
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int bar = 15-group - (nworkers!=nthreads ? 1 : 0);
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barrier_sync(bar, nworkers);
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}
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}
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__device__ bool barrierAny(int vote) {
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if (nthreads == WARP_SIZE) {
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return __any_sync(~0u, vote);
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} else {
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int name = 15-group;
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return barrier_red_or(vote, name, nthreads);
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}
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}
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__device__ bool subBarrierAny(int vote) {
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if (nworkers == WARP_SIZE) {
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return __any_sync(~0u, vote);
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} else {
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int name = 15-group - (nworkers!=nthreads ? 1 : 0);
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return barrier_red_or(vote, name, nworkers);
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}
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}
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inline __device__ bool checkAbort(int &spins) {
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spins++;
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if (!(flags & Aborted) && spins == NCCL_SPINS_BEFORE_CHECK_ABORT) {
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if (*ncclShmem.comm.abortFlag) {
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flags |= Aborted;
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ncclShmem.aborted = 1;
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}
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spins = 0;
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}
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return flags & Aborted;
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}
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inline __device__ uint64_t loadStepValue(uint64_t* ptr) {
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#if __CUDA_ARCH__ >= 900 && CUDART_VERSION >= 12010
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if (flags & NvlsMinPolling) {
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uint64_t ans;
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asm volatile("multimem.ld_reduce.acquire.sys.global.min.u64 %0, [%1];" : "=l"(ans) : "l"(cvta_to_global(ptr)) : "memory");
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return ans;
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}
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#endif
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// volatile is faster than acquire but not as correct. Make sure reduceCopy
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// loads data using volatile so it doesn't see stale data in L1.
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return ld_volatile_global(ptr);
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}
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template <int DirectRecv, int DirectSend, int Recv, int Send, int Src, int Dst>
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__device__ __forceinline__ void waitPeer(intptr_t srcIx, intptr_t dstIx, int offset, int nelts) {
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const bool isSendNotRecv = (Send && Recv) ? (flags & RoleWaitSend) : Send;
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// Yes, for some template arguments this code will be unreachable. That's fine.
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// coverity[dead_error_line]
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if ((flags & (Recv * RoleWaitRecv)) || (flags & (Send * RoleWaitSend))) {
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int spins = 0;
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while (connStepCache + (isSendNotRecv ? NCCL_STEPS : 0) < step + StepPerSlice) {
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connStepCache = loadStepValue(connStepPtr);
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if (checkAbort(spins)) break;
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//if (spins == 0) printf("r=%d b=%d t=%d SPUN OUT got=%d want=%d\n", ncclShmem.comm.rank, blockIdx.x, threadIdx.x, int(connStepCache + (isSendNotRecv ? NCCL_STEPS : 0)), int(step+StepPerSlice));
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}
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}
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if (flags & (Recv*RoleWaitRecv | Send*RoleWaitSend)) {
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if ((flags & ConnFifoEnabled) && (flags & (Send * RoleWaitSend)))
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connFifo[step%NCCL_STEPS].size = nelts*sizeof(T);
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void **ptrs = isSendNotRecv ? (ncclShmem.groups[group].dsts + Dst)
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: (ncclShmem.groups[group].srcs + Src);
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if (flags & NetRegMode) {
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if (P2p) {
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ptrs[index] = NULL;
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} else {
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if (isSendNotRecv) {
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if (!Recv)
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ptrs[index] = NULL;
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else
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ptrs[index] = (T*)ncclShmem.groups[group].userOutput + dstIx + offset;
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} else {
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ptrs[index] = (T*)ncclShmem.groups[group].userOutput + srcIx + offset;
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}
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}
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} else if ((flags & ConnFifoEnabled) && connFifo[step%NCCL_STEPS].mode == NCCL_MODE_OFFSET) {
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ptrs[index] = connEltsFifo + loadInt(&connFifo[step%NCCL_STEPS].offset)/sizeof(T);
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} else if (isSendNotRecv && DirectSend) {
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if (flags & DirectWrite) {
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ptrs[index] = directBuff + dstIx + offset;
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} else if (flags & DirectRead) { // empty send
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ptrs[index] = nullptr;
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} else {
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ptrs[index] = connEltsFifo + (step%NCCL_STEPS)*connStepSize;
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}
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} else if (!isSendNotRecv && DirectRecv) {
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if (flags & DirectRead) {
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ptrs[index] = directBuff + srcIx + offset;
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} else if (flags & DirectWrite) {
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ptrs[index] = directBuff + dstIx + offset; // send to next from my output buffer
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} else {
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ptrs[index] = connEltsFifo + (step%NCCL_STEPS)*connStepSize;
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}
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}
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else {
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// Yes, for some template arguments this code will be unreachable. That's fine.
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// coverity[dead_error_line]
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ptrs[index] = connEltsFifo + (step%NCCL_STEPS)*connStepSize;
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}
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if (flags & NetDeviceUnpack) {
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ncclNetDeviceIncrementHead(group, index);
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}
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step += StepPerSlice;
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}
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}
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template<int Recv, int Send>
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inline __device__ void postPeer(bool dataStored) {
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if (flags & (Recv*RolePostRecv | Send*RolePostSend)) {
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step += StepPerSlice;
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if (Send && (flags & RolePostSend) && (dataStored||(flags&ConnFifoEnabled))) {
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fence_acq_rel_sys();
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}
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st_relaxed_sys_global(connStepPtr, step);
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}
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}
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template <int DirectRecv1, int DirectSend1, int Recv, int Send, int SrcBuf, int DstBuf>
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__device__ __forceinline__ void genericOp(
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intptr_t srcIx, intptr_t dstIx, int nelem, bool postOp
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) {
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constexpr int DirectRecv = 1 && Direct && DirectRecv1;
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constexpr int DirectSend = 1 && Direct && DirectSend1;
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constexpr int Src = SrcBuf != -1;
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constexpr int Dst = DstBuf != -1;
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nelem = nelem < 0 ? 0 : nelem;
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int sliceSize = stepSize*StepPerSlice;
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sliceSize = max(divUp(nelem, 16*SlicePerChunk)*16, sliceSize/32);
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int slice = 0;
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int offset = 0;
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if (tid < nworkers && offset < nelem && !isNetOffload) {
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// Worker-only loop for non-empty slices. Non-workers and empty slices are
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// processed in the loop following this if block. The benefit of splitting
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// the loop like this is we pull two branches out of the critical path.
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// Using "number of branch insns (taken or not) encountered dynamically"
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// as the performance metric, then:
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// perf_orig = 2*numslices
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// perf_new = 2+numslices
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// So the new code and old code behave the same for numslices=2, and for
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// numslices>2 the new code is superior. And note that in the case
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// numslices=1, the loop is trivially unrollable (single iteration) so we
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// don't incur that that tail branch and we still have perf_new=2.
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//
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// ORIGINAL CODE:
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// unrolled for(slices) {
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// if(worker) { // This branch removed
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// wait();
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// subBarrier();
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// if(slice not empty) // This branch removed
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// ReduceCopyMulti();
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// }
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// barrier();
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// post();
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// } // Since we no longer unroll, new branch added here
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#if __CUDA_ARCH__ < 700
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// Above doesn't matter on older hardware.
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#pragma unroll SlicePerChunk
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#else
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#pragma unroll 1
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#endif
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do {
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sliceSize = sliceSize < nelem-offset ? sliceSize : nelem-offset;
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if (tid == 0) {
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T* userInput = (T*)ncclShmem.groups[group].userInput;
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T* userOutput = (T*)ncclShmem.groups[group].userOutput;
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if (Src) ncclShmem.groups[group].srcs[0] = (SrcBuf==Input ? userInput : userOutput) + srcIx + offset;
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if (Dst) ncclShmem.groups[group].dsts[0] = (DstBuf==Input ? userInput : userOutput) + dstIx + offset;
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}
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waitPeer<DirectRecv, DirectSend, Recv, Send, Src, Dst>(srcIx, dstIx, offset, sliceSize);
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subBarrier();
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/* if user abort the kernel, we don't need to actually perform copy/reduce; just set size
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* to 0 to avoid unnecessary workload. */
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int workSize = ncclShmem.aborted ? 0 : sliceSize;
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if (flags & AnyNetDeviceUnpack) {
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ncclNetDeviceUnpack<Recv>(tid, tidInBlock, nworkers, group, ncclShmem.groups[group].devicePlugin.unpack.unpackNetDeviceIndexMask, Src, workSize);
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// Sync here to make sure all workers are reading from the updated srcs)
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subBarrier();
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}
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if (DirectRecv && ncclShmem.groups[group].srcs[0] == ncclShmem.groups[group].dsts[0]
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/* NVLS can have srcs[0] == dsts[0], but we cannot enter this "if branch",
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* so we need to check whether MultimemSrcs and MultimemDsts are 0. */
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&& MultimemSrcs == 0 && MultimemDsts == 0 && !Src) {
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// We can only have one direct receive. Since srcs[0] == dstPtr+offset, skip one copy
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if (Send && Dst && ncclShmem.groups[group].srcs[0] != ncclShmem.groups[group].dsts[1]) {
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reduceCopy<Unroll, RedOp, T, 0, 1, 1, 0, 1, MaxSend, /*PreOpSrcs*/0>
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(tid, nworkers, /*redArg*/0, /*preOpArgs*/nullptr, /*postOp*/false,
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1, ncclShmem.groups[group].srcs,
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fan.nsend(), ncclShmem.groups[group].dsts+1,
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workSize);
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}
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} else if (DirectSend && !DirectRecv && SrcBuf != Input && ncclShmem.groups[group].dsts[Dst] == nullptr) {
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// For broadcast in CollNet to do empty send
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reduceCopy<Unroll, RedOp, T, 0, 1, 1, 0, 1, 1, /*PreOpSrcs*/0>
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(tid, nworkers, ncclShmem.redOpArgs[0], nullptr, postOp,
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Recv, ncclShmem.groups[group].srcs,
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Dst, ncclShmem.groups[group].dsts,
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workSize);
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} else if (ncclShmem.groups[group].srcs[0] && ncclShmem.groups[group].dsts[0]) {
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constexpr int PreOpSrcs = SrcBuf != Input ? 0 :
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DirectRecv*MaxRecv == NCCL_MAX_DIRECT_ARITY ? (1+NCCL_MAX_DIRECT_ARITY) : 1;
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if (Send && Dst && ncclShmem.groups[group].dsts[1] == nullptr) {
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// this case should only be directCopySend() with registered buffers and send to net peer
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reduceCopy<Unroll, RedOp, T,
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0, Recv + Src, Recv * MaxRecv + Src,
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0, 1, 1, PreOpSrcs>
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(tid, nworkers, ncclShmem.redOpArgs[0], ncclShmem.redOpArgs, postOp,
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Recv * fan.nrecv() + Src, ncclShmem.groups[group].srcs,
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1, ncclShmem.groups[group].dsts,
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workSize);
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} else {
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reduceCopy<Unroll, RedOp, T,
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MultimemSrcs, Recv + Src, Recv * MaxRecv + Src,
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MultimemDsts, Send + Dst, Send * MaxSend + Dst, PreOpSrcs>
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(tid, nworkers, ncclShmem.redOpArgs[0], ncclShmem.redOpArgs, postOp,
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Recv * fan.nrecv() + Src, ncclShmem.groups[group].srcs,
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Send * fan.nsend() + Dst, ncclShmem.groups[group].dsts,
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workSize);
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}
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} else {
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// we will come here when calling prims.directSend with net peer,
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// in this case, ncclShmem.groups[group].dsts[0] == NULL, so we
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// skip data flush.
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workSize = 0;
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}
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barrier(); // This barrier has a counterpart in following loop
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postPeer<Recv, Send>(0 < workSize);
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offset += sliceSize;
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slice += 1;
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// Yes, for some template arguments this code will be unreachable. That's fine.
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// coverity[dead_error_line]
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} while (slice < SlicePerChunk && offset < nelem);
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}
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// Non-workers come straight here. Workers too but only once the remaining
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// slices are all empty. Since empty slices are the uncommon case, and
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// worker perf is the limiter, perf-wise this loop is effectively unentered,
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// hence just a single branch insn.
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#pragma unroll 1
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while (slice < SlicePerChunk) {
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sliceSize = sliceSize < nelem-offset ? sliceSize : nelem-offset;
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{ // Only workers could have Wait roles so we know the slice must be empty
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// since we've exited the loop above.
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waitPeer<DirectRecv, DirectSend, Recv, Send, Src, Dst>(0, 0, 0, sliceSize);
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}
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barrier(); // Has couterpart in preceding worker-only loop.
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int workSize = ncclShmem.aborted ? 0 : sliceSize;
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postPeer<Recv, Send>(0 < workSize);
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offset += sliceSize;
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slice += 1;
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}
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}
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public:
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static inline __device__ void sendPeerNotify(int peer, int connIndex, int steps) {
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ncclDevChannelPeer* peerPtr = ncclShmem.channel.peers[peer];
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peerPtr->send[connIndex].step += steps;
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st_relaxed_sys_global(peerPtr->send[connIndex].tail, peerPtr->send[connIndex].step);
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}
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static inline __device__ void recvPeerNotify(int peer, int connIndex, int steps) {
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int spins = 0;
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ncclDevChannelPeer* peerPtr = ncclShmem.channel.peers[peer];
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peerPtr->recv[connIndex].step += steps;
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st_relaxed_sys_global(peerPtr->recv[connIndex].head, peerPtr->recv[connIndex].step);
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while (ld_volatile_global(peerPtr->recv[connIndex].tail) < peerPtr->recv[connIndex].step) {
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if (spins++ == NCCL_SPINS_BEFORE_CHECK_ABORT) {
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if (*ncclShmem.comm.abortFlag) {
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ncclShmem.aborted = 1;
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break;
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}
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spins = 0;
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}
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}
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}
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template<int Recv, int Send, typename Fn>
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__device__ __forceinline__ void process(Fn &&fn, uint32_t sendDirectFlag, uint32_t recvDirectFlag) {
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#pragma unroll 1
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for (int slice=0; slice < SlicePerChunk; slice++) {
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if (tid < nworkers) {
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int nsend, nrecv;
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if (flags & (Recv*RoleWaitRecv | Send*RoleWaitSend)) {
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const bool isSendNotRecv = (Send && Recv) ? (flags & RoleWaitSend) : Send;
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int spins = 0;
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while (connStepCache + (isSendNotRecv ? NCCL_STEPS : 0) < step + StepPerSlice) {
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connStepCache = loadStepValue(connStepPtr);
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if (checkAbort(spins)) break;
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}
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void **ptrs = isSendNotRecv ? ncclShmem.groups[group].dsts
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: ncclShmem.groups[group].srcs;
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if ((flags & ConnFifoEnabled) && connFifo[step%NCCL_STEPS].mode == NCCL_MODE_OFFSET) {
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int offset = loadInt(&connFifo[step%NCCL_STEPS].offset);
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ptrs[index] = connEltsFifo + offset/sizeof(T);
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} else if (Direct && fn.work->regUsed) {
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if (isSendNotRecv) {
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if (flags & DirectWrite) {
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ptrs[index] = directBuff;
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} else if (flags & DirectRead) { // empty send
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ptrs[index] = nullptr;
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} else {
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ptrs[index] = connEltsFifo + (step%NCCL_STEPS)*stepSize;
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}
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} else {
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if (flags & DirectRead) {
|
|
ptrs[index] = directBuff;
|
|
} else if (flags & DirectWrite) {
|
|
if (Send)
|
|
ptrs[index] = directBuff; // send to next from my output buffer
|
|
else
|
|
ptrs[index] = nullptr;
|
|
} else {
|
|
ptrs[index] = connEltsFifo + (step%NCCL_STEPS)*stepSize;
|
|
}
|
|
}
|
|
} else {
|
|
ptrs[index] = connEltsFifo + (step%NCCL_STEPS)*stepSize;
|
|
}
|
|
}
|
|
subBarrier();
|
|
if (Recv == 0 || ncclShmem.groups[group].srcs[0] == nullptr) {
|
|
nrecv = 0;
|
|
} else {
|
|
nrecv = fan.nrecv();
|
|
}
|
|
|
|
if (Send == 0 || ncclShmem.groups[group].dsts[0] == nullptr) {
|
|
nsend = 0;
|
|
} else {
|
|
nsend = fan.nsend();
|
|
}
|
|
fn.template operator() < SlicePerChunk, 0, Recv*MaxRecv, 0, Send*MaxSend >
|
|
(tid, nworkers, slice, stepSize * StepPerSlice,
|
|
nrecv, ncclShmem.groups[group].srcs,
|
|
nsend, ncclShmem.groups[group].dsts, ncclShmem.groups[group].dstSizes, sendDirectFlag, recvDirectFlag);
|
|
}
|
|
barrier();
|
|
int32_t dstSize = 0;
|
|
if (flags & Send*RolePostSend) {
|
|
// Yes, for some template arguments this code will be unreachable. That's fine.
|
|
// coverity[dead_error_begin]
|
|
dstSize = ncclShmem.groups[group].dstSizes[index];
|
|
ncclShmem.groups[group].dstSizes[index] = 0;
|
|
if (flags & ConnFifoEnabled) connFifo[step%NCCL_STEPS].size = dstSize*sizeof(T);
|
|
}
|
|
barrier();
|
|
if (flags & (Recv*(RoleWaitRecv|RolePostRecv) | Send*(RoleWaitSend|RolePostSend))) {
|
|
step += StepPerSlice;
|
|
}
|
|
if (flags & (Recv*RolePostRecv | Send*RolePostSend)) {
|
|
if (Send && (!Recv || (flags & RolePostSend)) && (dstSize!=0 || (flags&ConnFifoEnabled))) {
|
|
fence_acq_rel_sys();
|
|
}
|
|
st_relaxed_sys_global(connStepPtr, step);
|
|
}
|
|
}
|
|
}
|
|
|
|
private:
|
|
// Scatter/Gather generic op
|
|
// skip: my own rank order in the buffer chunks
|
|
// shift: peer offset to avoid all ranks sending to or receiving from same peer
|
|
template <int DirectRecv1, int DirectSend1, int Recv, int Send>
|
|
__device__ __forceinline__ void
|
|
ScatterGatherOp(intptr_t inpIx, intptr_t outIx, ssize_t totalElem, int peerElem, ssize_t peerOffset, int skip, int shift, bool postOp) {
|
|
constexpr int DirectRecv = 1 && Direct && DirectRecv1;
|
|
constexpr int DirectSend = 1 && Direct && DirectSend1;
|
|
int offset = 0; // slice offset
|
|
int sliceSize = stepSize*StepPerSlice;
|
|
int dataSize = max(DIVUP(peerElem, 16*SlicePerChunk)*16, sliceSize/32); // per-peer slice size
|
|
|
|
#pragma unroll
|
|
for (int slice=0; slice<SlicePerChunk; ++slice) {
|
|
ssize_t realSize = max(0, min(dataSize, peerElem-offset));
|
|
bool fenceNeeded = false;
|
|
if (tid < nworkers) {
|
|
if (Send) {
|
|
// Scatter pre-scales data of input buffer only in non-Direct case
|
|
constexpr int PreOpSrcs = DirectSend ? 0 : 1;
|
|
if (tid==0) ncclShmem.groups[group].srcs[0] = (T*)ncclShmem.groups[group].userInput + inpIx + offset;
|
|
// realSize is not accurate here; but intra-node does not rely on sizes FIFO
|
|
waitPeer<0, DirectSend, 0, 1, 1, 0>(0, inpIx, offset, realSize);
|
|
subBarrier();
|
|
#pragma unroll
|
|
// Loop over peers
|
|
for (int j=0; j<fan.nsend(); j++) {
|
|
int i = (j+shift)%fan.nsend();
|
|
ssize_t pOffset = i*peerOffset;
|
|
// Skip the data I am responsible of reducing myself
|
|
if (skip >= 0 && i >= skip) pOffset += peerOffset;
|
|
void* src0 = (T*)ncclShmem.groups[group].srcs[0] + pOffset;
|
|
ssize_t realPeerSize = min(realSize, totalElem-pOffset);
|
|
if (realPeerSize > 0 && ncclShmem.groups[group].dsts[i] != nullptr) {
|
|
reduceCopy<Unroll, RedOp, T, 0,1,1, 0,1,1, PreOpSrcs>(tid, nworkers, ncclShmem.redOpArgs[0], ncclShmem.redOpArgs, false, 1, &src0, 1, ncclShmem.groups[group].dsts+i, realPeerSize);
|
|
// Mark for threadfence at the end
|
|
fenceNeeded |= true;
|
|
}
|
|
}
|
|
} else if (Recv) {
|
|
if (tid==0) ncclShmem.groups[group].dsts[0] = (T*)ncclShmem.groups[group].userOutput + outIx + offset;
|
|
ssize_t pOffset = index*peerOffset;
|
|
if (skip >= 0 && index >= skip) pOffset += peerOffset;
|
|
// Adjust remote index with peer offset in case we are directly pulling from peer's output buffer
|
|
waitPeer<DirectRecv, 0, 1, 0, 0, 1>(outIx+pOffset, outIx+pOffset, offset, realSize);
|
|
subBarrier();
|
|
#pragma unroll
|
|
for (int j=0; j<fan.nrecv(); j++) {
|
|
int i = (j+shift)%fan.nrecv();
|
|
pOffset = i*peerOffset;
|
|
if (skip >= 0 && i >= skip) pOffset += peerOffset;
|
|
void* dst0 = (T*)ncclShmem.groups[group].dsts[0] + pOffset;
|
|
ssize_t realPeerSize = min(realSize, totalElem-pOffset);
|
|
if (DirectRecv && ncclShmem.groups[group].srcs[i] == dst0) realPeerSize = 0;
|
|
if (realPeerSize > 0) reduceCopy<Unroll, RedOp, T, 0,1,1, 0,1,1, /*PreOpSrcs=*/0>(tid, nworkers, ncclShmem.redOpArgs[0], ncclShmem.redOpArgs, postOp, 1, ncclShmem.groups[group].srcs+i, 1, &dst0, realPeerSize);
|
|
}
|
|
}
|
|
}
|
|
fenceNeeded = barrierAny(fenceNeeded);
|
|
postPeer<Recv, Send>(fenceNeeded);
|
|
offset += realSize;
|
|
}
|
|
}
|
|
|
|
__device__ __forceinline__ void loadRecvConn(ncclDevChannelPeer *peer, int connIndex, uint32_t direct, int ipcRegFlag, int netRegFlag) {
|
|
conn = &peer->recv[connIndex];
|
|
if (conn->netDeviceHandle.netDeviceType == NCCL_NET_DEVICE_UNPACK) {
|
|
// handle must be a device ptr
|
|
netDeviceHandle = conn->netDeviceHandle.handle;
|
|
// Cache the handle
|
|
ncclNetDeviceUnpackSetup(netDeviceHandle, group, index);
|
|
flags |= NetDeviceUnpack;
|
|
}
|
|
step = conn->step;
|
|
step = roundUp(step, SlicePerChunk*StepPerSlice);
|
|
if (flags & RolePostRecv) {
|
|
connStepPtr = conn->head;
|
|
*connStepPtr = step; // Return credits in case we rounded up.
|
|
}
|
|
if (flags & RoleWaitRecv) {
|
|
if ((flags & PatMode) == 0) ncclShmem.groups[group].recvConns[index] = conn; // WaitRecv role saves since that's who needs it in setDataPtrs()
|
|
flags |= (conn->flags & NCCL_NVLS_MIN_POLL) ? NvlsMinPolling : 0;
|
|
connStepPtr = conn->tail;
|
|
connStepCache = loadStepValue(connStepPtr);
|
|
connStepSize = conn->stepSize/sizeof(T);
|
|
connEltsFifo = (T*)conn->buffs[NCCL_PROTO_SIMPLE];
|
|
if (conn->connFifo != nullptr) {
|
|
flags |= ConnFifoEnabled;
|
|
connFifo = conn->connFifo;
|
|
}
|
|
if (Direct) {
|
|
if (ipcRegFlag) {
|
|
// User buffers have been registered
|
|
if (conn->flags & (NCCL_P2P_READ | NCCL_P2P_WRITE)) {
|
|
if (P2p) {
|
|
flags |= conn->flags & NCCL_P2P_WRITE ? DirectWrite : DirectRead;
|
|
} else if (connIndex == 1 && direct) {
|
|
flags |= DirectRead;
|
|
} else {
|
|
flags |= direct & NCCL_P2P_READ ? DirectRead : DirectWrite;
|
|
}
|
|
} else if ((conn->flags & NCCL_NVLS_MIN_POLL)) {
|
|
/* NVLS direct */
|
|
flags |= DirectRead;
|
|
}
|
|
}
|
|
if (netRegFlag) {
|
|
if (conn->flags & NCCL_DIRECT_NIC) {
|
|
flags |= NetRegMode;
|
|
connFifo[step % NCCL_STEPS].size = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
__device__ __forceinline__ void loadSendConn(ncclDevChannelPeer *peer, int connIndex, uint32_t direct, int ipcRegFlag, int netRegFlag) {
|
|
conn = &peer->send[connIndex];
|
|
step = conn->step;
|
|
step = roundUp(step, SlicePerChunk*StepPerSlice);
|
|
|
|
connFifo = conn->connFifo;
|
|
if (connFifo != nullptr) flags |= ConnFifoEnabled;
|
|
|
|
if (flags & RolePostSend) {
|
|
connStepPtr = conn->tail;
|
|
connEltsFifo = (T*)conn->buffs[NCCL_PROTO_SIMPLE];
|
|
}
|
|
if (flags & RoleWaitSend) {
|
|
if ((flags & PatMode) == 0) ncclShmem.groups[group].sendConns[index] = conn; // WaitSend role saves since that's who needs it in setDataPtrs()
|
|
flags |= (conn->flags & NCCL_NVLS_MIN_POLL) ? NvlsMinPolling : 0;
|
|
connStepPtr = conn->head;
|
|
connStepCache = loadStepValue(connStepPtr);
|
|
connStepSize = conn->stepSize/sizeof(T);
|
|
connEltsFifo = (T*)conn->buffs[NCCL_PROTO_SIMPLE];
|
|
if (Direct) {
|
|
if (ipcRegFlag) {
|
|
// User buffers have been registered
|
|
if (conn->flags & (NCCL_P2P_WRITE | NCCL_P2P_READ)) {
|
|
if (P2p) {
|
|
flags |= conn->flags & NCCL_P2P_WRITE ? DirectWrite : DirectRead;
|
|
} else if (connIndex == 1 && direct) {
|
|
flags |= DirectRead; // scatter-reduce use direct pull
|
|
} else {
|
|
flags |= direct & NCCL_P2P_READ ? DirectRead : DirectWrite;
|
|
}
|
|
} else if ((conn->flags & NCCL_NVLS_MIN_POLL)) {
|
|
/* NVLS direct */
|
|
flags |= DirectWrite;
|
|
}
|
|
}
|
|
if (netRegFlag) {
|
|
if (conn->flags & NCCL_DIRECT_NIC) {
|
|
flags |= NetRegMode;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public:
|
|
__device__ Primitives(
|
|
int tid, int nthreads, int const *recvPeers, int const *sendPeers,
|
|
void const *inputBuf, void *outputBuf, uint64_t redOpArg, uint8_t group=0,
|
|
uint8_t connIndexRecv = 0, uint8_t connIndexSend = 0, struct ncclDevWorkColl* collWork = nullptr,
|
|
struct ncclDevWorkP2p* p2pWork = nullptr, int stepSize_ = 0, int mode = primsModeDefault
|
|
):
|
|
tid(tid), nthreads(nthreads), tidInBlock(threadIdx.x), group(group),
|
|
stepSize(stepSize_ == 0 ? ncclShmem.comm.buffSizes[NCCL_PROTO_SIMPLE]/NCCL_STEPS/sizeof(T) : stepSize_) {
|
|
|
|
// For send operations, we need an extra warp to overlap the threadfence and the copy
|
|
this->nworkers = nthreads - (MaxSend > 0 && nthreads >= NCCL_SIMPLE_EXTRA_GROUP_IF_NTHREADS_GE ? WARP_SIZE : 0);
|
|
|
|
int peer = -1;
|
|
flags = 0;
|
|
index = -1;
|
|
if (mode == primsModeDefault) { // Connect to ranks in sendPeers/recvPeers
|
|
int nrecv=0, nsend=0;
|
|
// Yes, for some template arguments this code will be unreachable. That's fine.
|
|
// coverity[dead_error_line]
|
|
while (nrecv < MaxRecv && recvPeers[nrecv] != -1) nrecv++;
|
|
// coverity[dead_error_line]
|
|
while (nsend < MaxSend && sendPeers[nsend] != -1) nsend++;
|
|
this->fan = Fan(nrecv, nsend);
|
|
|
|
constexpr int ThreadPerSync =
|
|
MaxSend >= 16 || MaxRecv >= 16 ? 32 : // NVLS may have an arity > 8. In that case increase the size of the groups
|
|
MaxSend >= 8 || MaxRecv >= 8 ? 16 :
|
|
8; // Allows for all roles (WaitRecv/WaitSend/PostRecv/PostSend) within a single warp
|
|
static_assert(MaxSend <= ThreadPerSync && MaxRecv <= ThreadPerSync, "Not enough threads to cover all peers");
|
|
|
|
assert(2*(nrecv+nsend) <= nthreads); // Ensure no thread is assigned more than one role.
|
|
// Coverity assumes that index will equal tid based on the line below, but it doesn't consider the setting
|
|
// of flags. This results in multiple false positive overruns being reported here and in all_reduce.h.
|
|
// Unfortunately, we've been unsuccessful in trying to silence them with a single directive here so
|
|
// instead it's being done at the callers.
|
|
// coverity[assignment:FALSE]
|
|
if (tid < nrecv) { flags |= RoleWaitRecv; index = tid; }
|
|
// Yes, for some template arguments this code will be unreachable. That's fine.
|
|
// coverity[dead_error_begin]
|
|
else if (tid < nrecv+nsend) { flags |= RoleWaitSend; index = tid-nrecv; }
|
|
else if (nthreads-nsend <= tid) { flags |= RolePostSend; index = tid-(nthreads-nsend); }
|
|
else if (nthreads-nrecv-nsend <= tid) { flags |= RolePostRecv; index = tid-(nthreads-nrecv-nsend); }
|
|
|
|
if (flags & (RoleWaitRecv|RolePostRecv)) peer = recvPeers[index];
|
|
if (flags & (RoleWaitSend|RolePostSend)) peer = sendPeers[index];
|
|
} else if (mode == primsModePatRs || mode == primsModePatAg) { // Connect to all ranks +/- 2^n
|
|
flags |= PatMode;
|
|
accSize = 0;
|
|
int nranks = ncclShmem.comm.nRanks;
|
|
int rank = ncclShmem.comm.rank;
|
|
// A thread is responsible for rank +/- 2 ^ (tid%32). That should be fine as long as rank is a 32-bits integer.
|
|
index = tid % 32;
|
|
uint32_t delta = 1 << index;
|
|
const int roles[4] = { RoleWaitRecv, RoleWaitSend, RolePostSend, RolePostRecv};
|
|
int block = tid / 32;
|
|
if (block < 4 && delta < nranks) {
|
|
int role = roles[block];
|
|
if (mode == primsModePatRs) {
|
|
if (role & (RoleWaitRecv|RolePostRecv)) peer = (rank - delta + nranks) % nranks;
|
|
if (role & (RoleWaitSend|RolePostSend)) peer = (rank + delta) % nranks;
|
|
} else if (mode == primsModePatAg) {
|
|
if (role & (RoleWaitSend|RolePostSend)) peer = (rank - delta + nranks) % nranks;
|
|
if (role & (RoleWaitRecv|RolePostRecv)) peer = (rank + delta) % nranks;
|
|
}
|
|
flags |= role;
|
|
} else if (tid == 128) {
|
|
flags |= RoleInput | RoleOutput; // Only one will be used depending on the operation
|
|
}
|
|
}
|
|
|
|
// Coverity thinks that index could be -1 here but that's not actually the case.
|
|
// coverity[negative_returns:FALSE]
|
|
int sendIpcReg;
|
|
int recvIpcReg;
|
|
int sendNetReg;
|
|
int recvNetReg;
|
|
if (P2p) {
|
|
sendIpcReg = p2pWork ? p2pWork->sendIpcReg : 0;
|
|
recvIpcReg = p2pWork ? p2pWork->recvIpcReg : 0;
|
|
sendNetReg = p2pWork ? p2pWork->sendNetReg : 0;
|
|
recvNetReg = p2pWork ? p2pWork->recvNetReg : 0;
|
|
} else {
|
|
recvIpcReg = sendIpcReg = collWork ? collWork->regUsed : 0;
|
|
recvNetReg = sendNetReg = collWork ? collWork->netRegUsed : 0;
|
|
}
|
|
// coverity[overrun-call] => Coverity think prims.index can be greater than 1
|
|
if (flags & (RoleWaitRecv|RolePostRecv)) loadRecvConn(ncclShmem.channel.peers[peer], connIndexRecv, collWork ? collWork->direct : 0, recvIpcReg, recvNetReg);
|
|
// coverity[overrun-call] => Coverity think prims.index can be greater than 1
|
|
if (flags & (RoleWaitSend|RolePostSend)) loadSendConn(ncclShmem.channel.peers[peer], connIndexSend, collWork ? collWork->direct : 0, sendIpcReg, sendNetReg);
|
|
|
|
if (barrierAny(flags & NetDeviceUnpack)) {
|
|
flags |= AnyNetDeviceUnpack;
|
|
// RoleWaitRecv starts at tid=0, so this creates the bitmask of which recv peers
|
|
// have NetDeviceUnpack.
|
|
uint32_t mask = __ballot_sync(~0u, ((flags & RoleWaitRecv) && (flags & NetDeviceUnpack)) ? 1 : 0);
|
|
if (tid == 0) {
|
|
ncclShmem.groups[this->group].devicePlugin.unpack.unpackNetDeviceIndexMask = mask;
|
|
}
|
|
}
|
|
|
|
// coverity[negative_returns:FALSE] => coverity thinks that index could be -1 but that's not actually the case
|
|
// coverity[var_deref_model] => coverity thinks work can dereferenced if NULL but this is not the case
|
|
setDataPtrs(inputBuf, outputBuf, redOpArg, (struct ncclDevWorkCollReg*)collWork, sendIpcReg || recvIpcReg, peer);
|
|
// coverity[uninit_member] => coverity thinks fan.n is not initialized
|
|
}
|
|
|
|
__device__ ~Primitives() {
|
|
// Save steps for the next operation
|
|
if (flags & (RolePostSend|RolePostRecv)) conn->step = step;
|
|
if ((flags & NetRegMode) && (flags & RoleWaitSend)) {
|
|
// Make sure we wait until the proxy has sent data before we return.
|
|
// We don't want the next CUDA kernel to overwrite the send buffer which
|
|
// was accessed directly.
|
|
uint64_t prevStep = step - StepPerSlice;
|
|
volatile ssize_t* ptr = &(connFifo[prevStep%NCCL_STEPS].size);
|
|
int spins = 0;
|
|
while (*ptr != -1) if (checkAbort(spins)) break;
|
|
}
|
|
|
|
if (flags & NetDeviceUnpack) {
|
|
ncclNetDeviceSaveHead(netDeviceHandle, group, index);
|
|
}
|
|
|
|
// Make sure all threads are done writing back conn->step and done using
|
|
// ncclShmem.groups[group]
|
|
barrier();
|
|
|
|
if ((flags & DirectRead) && (flags & RoleWaitSend) && P2p) {
|
|
// For sendrecv DirectRead, sender needs to wait for receiver reading data from src.
|
|
// This has to be done after barrier() since post thread might have contention with
|
|
// this check.
|
|
int spins = 0;
|
|
volatile uint64_t* tail = conn->tail;
|
|
volatile uint64_t* head = conn->head;
|
|
while (*tail > *head) if (checkAbort(spins)) break;
|
|
}
|
|
}
|
|
|
|
__device__ void setDataPtrs(void const *inputBuf, void *outputBuf, uint64_t redOpArg, struct ncclDevWorkCollReg* work, uint8_t ipcReg, int peer) {
|
|
if (tid==0) {
|
|
ncclShmem.groups[group].userInput = (void*)inputBuf;
|
|
ncclShmem.groups[group].userOutput = (void*)outputBuf;
|
|
ncclShmem.redOpArgs[0] = redOpArg; // scaler for local input
|
|
}
|
|
|
|
if (Direct && ipcReg) {
|
|
bool recvProvider = (flags & RoleWaitRecv) && (flags & DirectWrite);
|
|
bool sendAcceptor = (flags & RoleWaitSend) && (flags & DirectWrite);
|
|
bool sendProvider = (flags & RoleWaitSend) && (flags & DirectRead); // sender provides direct buffer (to be fetched)
|
|
bool recvAcceptor = (flags & RoleWaitRecv) && (flags & DirectRead); // receiver accepts direct buffer
|
|
if (recvProvider) {
|
|
int spins = 0;
|
|
void* volatile* slot = ncclShmem.groups[group].recvConns[index]->ptrExchange;
|
|
// Wait for consumer to consume previous value before trampling it.
|
|
if (slot) {
|
|
T* exchgPtr;
|
|
directBuff = (T*)outputBuf;
|
|
while (*slot != nullptr && !checkAbort(spins));
|
|
if (P2p) {
|
|
exchgPtr = (T*)outputBuf;
|
|
} else {
|
|
int localPeer = ncclShmem.comm.rankToLocalRank[peer];
|
|
// coverity[deref_parm:FALSE] => work cannot be NULL if ipcReg != NULL
|
|
exchgPtr = (T*)(work->coll.recvbuffOffset + work->coll.recvbuffRmtAddrs[localPeer]);
|
|
}
|
|
*slot = reinterpret_cast<void*>(exchgPtr);
|
|
}
|
|
}
|
|
if (sendAcceptor) {
|
|
int spins = 0;
|
|
void* volatile* slot = ncclShmem.groups[group].sendConns[index]->ptrExchange;
|
|
void* ptr;
|
|
while (slot) {
|
|
ptr = *slot;
|
|
if (ptr != nullptr || checkAbort(spins)) break;
|
|
}
|
|
|
|
if (slot) {
|
|
directBuff = reinterpret_cast<T*>(ptr);
|
|
*slot = nullptr;
|
|
} else {
|
|
// coverity[var_deref_op]
|
|
directBuff = (T*)work->dnOutputs[index];
|
|
}
|
|
}
|
|
if (sendProvider) {
|
|
int spins = 0;
|
|
void* volatile* slot = ncclShmem.groups[group].sendConns[index]->ptrExchange;
|
|
volatile uint64_t* argSlot0 = ncclShmem.groups[group].sendConns[index]->redOpArgExchange;
|
|
volatile uint64_t* argSlot1 = ncclShmem.groups[group].sendConns[index]->redOpArgExchange + 1;
|
|
// Wait for consumer to consume previous value before trampling it.
|
|
if (slot && argSlot0 && argSlot1) {
|
|
T* exchgPtr;
|
|
while ((*slot != nullptr || *argSlot0 != 0 || *argSlot1 != 0) && !checkAbort(spins));
|
|
// If there is no recv, then we are directly pulling from input buffer (e.g. directScatter)
|
|
// Otherwise, we are pulling from output buffer (e.g. recvCopyDirectSend)
|
|
directBuff = MaxRecv == 0 ? (T*)inputBuf : (T*)outputBuf;
|
|
if (P2p) {
|
|
exchgPtr = MaxRecv == 0 ? (T*)inputBuf : (T*)outputBuf;
|
|
} else {
|
|
int localPeer = ncclShmem.comm.rankToLocalRank[peer];
|
|
if (MaxRecv == 0)
|
|
// coverity[var_deref_op]
|
|
exchgPtr = (T*)(work->coll.sendbuffOffset + work->coll.sendbuffRmtAddrs[localPeer]);
|
|
else
|
|
// coverity[var_deref_op]
|
|
exchgPtr = (T*)(work->coll.recvbuffOffset + work->coll.recvbuffRmtAddrs[localPeer]);
|
|
}
|
|
|
|
// Exchange pre-scalers for use in direct pull
|
|
*argSlot0 = (uint64_t(1) << 32) | (uint32_t)redOpArg;
|
|
*argSlot1 = (uint64_t(1) << 32) | (uint32_t)(redOpArg >> 32);
|
|
*slot = reinterpret_cast<T*>(exchgPtr);
|
|
}
|
|
}
|
|
if (recvAcceptor) {
|
|
int spins = 0;
|
|
void* volatile* slot = ncclShmem.groups[group].recvConns[index]->ptrExchange;
|
|
volatile uint64_t* argSlot0 = ncclShmem.groups[group].recvConns[index]->redOpArgExchange;
|
|
volatile uint64_t* argSlot1 = ncclShmem.groups[group].recvConns[index]->redOpArgExchange + 1;
|
|
void* ptr;
|
|
while (slot) {
|
|
ptr = *slot;
|
|
if (ptr != nullptr || checkAbort(spins)) break;
|
|
}
|
|
|
|
if (slot && argSlot0 && argSlot1) {
|
|
directBuff = reinterpret_cast<T*>(ptr);
|
|
if (MaxSend != 0) { // reduce group rather than gather group
|
|
// Store scalers for remote inputs
|
|
uint64_t arg0, arg1;
|
|
while (true) {
|
|
arg0 = *argSlot0;
|
|
arg1 = *argSlot1;
|
|
if ((arg0 != 0 && arg1 != 0) || checkAbort(spins)) break;
|
|
}
|
|
ncclShmem.redOpArgs[1 + index] = ((arg1 & 0xffffffff) << 32) | (arg0 & 0xffffffff);
|
|
}
|
|
*argSlot0 = 0; *argSlot1 = 0;
|
|
*slot = nullptr;
|
|
} else {
|
|
// Coverity complains about work being possibly NULL below. However, slot
|
|
// being NULL means that the NVLS buffer is registered (regUsed == 1)
|
|
// so work can't be NULL in this code path.
|
|
// coverity[var_deref_op]
|
|
directBuff = (T*)work->dnInputs[index];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
__device__ void moveDataPtrs(intptr_t delta) {
|
|
if (tid==0) {
|
|
ncclShmem.groups[group].userInput = (T*)ncclShmem.groups[group].userInput + delta;
|
|
ncclShmem.groups[group].userOutput = (T*)ncclShmem.groups[group].userOutput + delta;
|
|
}
|
|
}
|
|
|
|
__device__ __forceinline__ void send(intptr_t inpIx, int eltN) {
|
|
genericOp<0, 0, 0, 1, Input, -1>(inpIx, -1, eltN, false);
|
|
}
|
|
__device__ __forceinline__ void sendFromOutput(intptr_t outIx, int eltN) {
|
|
genericOp<0, 0, 0, 1, Output, -1>(outIx, -1, eltN, false);
|
|
}
|
|
__device__ __forceinline__ void directSend(intptr_t inpIx, intptr_t outIx, int eltN) {
|
|
genericOp<0, 1, 0, 1, Input, -1>(inpIx, outIx, eltN, false);
|
|
}
|
|
__device__ __forceinline__ void directSendFromOutput(intptr_t outIx, int eltN) {
|
|
genericOp<0, 1, 0, 1, Output, -1>(outIx, outIx, eltN, false);
|
|
}
|
|
|
|
__device__ __forceinline__ void recv(intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 0, 1, 0, -1, Output>(-1, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecv(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<1, 0, 1, 0, -1, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecvCopy(intptr_t inpIx, intptr_t outIx, int eltN) {
|
|
genericOp<1, 0, 1, 0, -1, Output>(inpIx, outIx, eltN, /*postOp=*/false);
|
|
}
|
|
|
|
__device__ __forceinline__ void copySend(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 0, 0, 1, Input, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directCopySend(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 1, 0, 1, Input, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
|
|
__device__ __forceinline__ void recvSend(int eltN, bool postOp=false) {
|
|
genericOp<0, 0, 1, 1, -1, -1>(-1, -1, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void recvCopySend(intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 0, 1, 1, -1, Output>(-1, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecvCopyDirectSend(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<1, 1, 1, 1, -1, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecvDirectSend(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<1, 1, 1, 1, -1, -1>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void recvCopyDirectSend(intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 1, 1, 1, -1, Output>(-1, outIx, eltN, postOp);
|
|
}
|
|
|
|
__device__ __forceinline__ void recvReduceCopy(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 0, 1, 0, Input, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecvReduceCopy(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<1, 0, 1, 0, Input, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
|
|
__device__ __forceinline__ void recvReduceSend(intptr_t inpIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 0, 1, 1, Input, -1>(inpIx, -1, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecvReduceSend(intptr_t inpIx, int eltN, bool postOp=false) {
|
|
genericOp<1, 0, 1, 1, Input, -1>(inpIx, -1, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void recvReduceDirectSend(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 1, 1, 1, Input, -1>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecvReduceDirectSend(intptr_t inpIx, intptr_t outIx, ssize_t eltN, bool postOp=false) {
|
|
genericOp<1, 1, 1, 1, Input, -1>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
|
|
__device__ __forceinline__ void recvReduceCopySend(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
genericOp<0, 0, 1, 1, Input, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void recvReduceCopyDirectSend(intptr_t inpIx, intptr_t outIx, int eltN, bool postOp=false) {
|
|
// Direct is only for the send part
|
|
genericOp<0, 1, 1, 1, Input, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
__device__ __forceinline__ void directRecvReduceCopyDirectSend(intptr_t inpIx, intptr_t outIx, ssize_t eltN, bool postOp=false) {
|
|
genericOp<1, 1, 1, 1, Input, Output>(inpIx, outIx, eltN, postOp);
|
|
}
|
|
|
|
__device__ __forceinline__ void
|
|
scatter(intptr_t inpIx, ssize_t totalElem, int peerElem, ssize_t peerOffset, int skip, int shift) {
|
|
ScatterGatherOp<0, 0, 0, 1>(inpIx, -1, totalElem, peerElem, peerOffset, skip, shift, /*postOp=*/false);
|
|
}
|
|
__device__ __forceinline__ void
|
|
directScatter(intptr_t inpIx, ssize_t totalElem, int peerElem, ssize_t peerOffset, int skip, int shift) {
|
|
ScatterGatherOp<0, 1, 0, 1>(inpIx, -1, totalElem, peerElem, peerOffset, skip, shift, /*postOp=*/false);
|
|
}
|
|
|
|
__device__ __forceinline__ void
|
|
gather(intptr_t outIx, ssize_t totalElem, int peerElem, ssize_t peerOffset, int skip, int shift, bool postOp=false) {
|
|
ScatterGatherOp<0, 0, 1, 0>(-1, outIx, totalElem, peerElem, peerOffset, skip, shift, postOp);
|
|
}
|
|
__device__ __forceinline__ void
|
|
directGather(intptr_t outIx, ssize_t totalElem, int peerElem, ssize_t peerOffset, int skip, int shift) {
|
|
ScatterGatherOp<1, 0, 1, 0>(-1, outIx, totalElem, peerElem, peerOffset, skip, shift, /*postOp=*/false);
|
|
}
|
|
|
|
__device__ __forceinline__ void patReduce(int recvPow2, int sendPow2, intptr_t inpIx, intptr_t outIx, int recvOffset, int sendOffset, int sendStepOffset, int nelem, int postRecv, int postSend) {
|
|
nelem = nelem < 0 ? 0 : nelem;
|
|
T* userInput = (T*)ncclShmem.groups[group].userInput;
|
|
T* userOutput = (T*)ncclShmem.groups[group].userOutput;
|
|
|
|
if (recvPow2 >= 0 && recvPow2 == index && (flags & RoleWaitRecv)) {
|
|
ncclShmem.groups[group].srcs[0] = (T*)(connEltsFifo + (step%NCCL_STEPS)*connStepSize) + recvOffset;
|
|
int spins = 0;
|
|
while (connStepCache < step + StepPerSlice) {
|
|
connStepCache = loadStepValue(connStepPtr);
|
|
if (checkAbort(spins)) break;
|
|
}
|
|
if (postRecv) step += StepPerSlice;
|
|
}
|
|
if (sendPow2 >= 0 && sendPow2 == index && (flags & RoleWaitSend)) {
|
|
int spins = 0;
|
|
while (connStepCache + NCCL_STEPS < step + sendStepOffset + StepPerSlice) {
|
|
connStepCache = loadStepValue(connStepPtr);
|
|
if (checkAbort(spins)) break;
|
|
}
|
|
ncclShmem.groups[group].dsts[0] = (T*)(connEltsFifo + ((step+sendStepOffset)%NCCL_STEPS)*connStepSize) + sendOffset;
|
|
if (accSize < sendOffset + nelem + (step+sendStepOffset)*connStepSize) {
|
|
// New data, add our own data to it.
|
|
ncclShmem.groups[group].srcs[1] = userInput + inpIx;
|
|
accSize = sendOffset + nelem + (step+sendStepOffset)*connStepSize;
|
|
if (flags & ConnFifoEnabled)
|
|
connFifo[(step+sendStepOffset)%NCCL_STEPS].size = (sendOffset + nelem)*sizeof(T);
|
|
} else {
|
|
// There is already data in there, accumulate instead of writing to it.
|
|
ncclShmem.groups[group].srcs[1] = ncclShmem.groups[group].dsts[0];
|
|
}
|
|
if (postSend) step += StepPerSlice;
|
|
}
|
|
if (sendPow2 < 0 && (flags & RoleOutput)) { // Destination is our own local buffer
|
|
ncclShmem.groups[group].dsts[0] = userOutput + outIx;
|
|
if (accSize < outIx + nelem) {
|
|
// New data, add our own data to it.
|
|
ncclShmem.groups[group].srcs[1] = userInput + inpIx;
|
|
accSize = outIx + nelem;
|
|
} else {
|
|
// There is already data in there, accumulate instead of writing to it.
|
|
ncclShmem.groups[group].srcs[1] = ncclShmem.groups[group].dsts[0];
|
|
}
|
|
}
|
|
barrier();
|
|
int nSrcs = 2;
|
|
void** srcs = ncclShmem.groups[group].srcs;
|
|
if (recvPow2 < 0) { srcs++; nSrcs--; } // No peer to receive from, remove one source
|
|
|
|
int workSize = ncclShmem.aborted ? 0 : nelem;
|
|
|
|
reduceCopy<Unroll, RedOp, T, 0, 1, 2, 0, 1, 1, /*PreOpSrcs*/0>
|
|
(tid, nthreads, ncclShmem.redOpArgs[0], nullptr, /*postOp=*/false,
|
|
nSrcs, srcs, 1, ncclShmem.groups[group].dsts, workSize);
|
|
|
|
barrier();
|
|
if (postRecv && recvPow2 >= 0 && recvPow2 == index && (flags & RolePostRecv)) postPeer<1, 0>(0 < nelem);
|
|
if (postSend && sendPow2 >= 0 && sendPow2 == index && (flags & RolePostSend)) postPeer<0, 1>(0 < nelem);
|
|
}
|
|
|
|
__device__ __forceinline__ void patCopy(int recvPow2, int sendPow2, intptr_t inpIx, intptr_t outIx, int recvOffset, int sendOffset, int recvStepOffset, int nelem, int postRecv, int postSend) {
|
|
nelem = nelem < 0 ? 0 : nelem;
|
|
T* userInput = (T*)ncclShmem.groups[group].userInput;
|
|
T* userOutput = (T*)ncclShmem.groups[group].userOutput;
|
|
|
|
if (recvPow2 >= 0 && recvPow2 == index && (flags & RoleWaitRecv)) {
|
|
ncclShmem.groups[group].srcs[0] = (T*)(connEltsFifo + ((step+recvStepOffset)%NCCL_STEPS)*connStepSize) + recvOffset;
|
|
int spins = 0;
|
|
while (connStepCache < step + recvStepOffset + StepPerSlice) {
|
|
connStepCache = loadStepValue(connStepPtr);
|
|
if (checkAbort(spins)) break;
|
|
}
|
|
if (accSize < recvOffset + nelem + (step+recvStepOffset)*connStepSize) {
|
|
// New data, copy to our output buffer.
|
|
ncclShmem.groups[group].dsts[1] = userOutput + outIx;
|
|
accSize = recvOffset + nelem + (step+recvStepOffset)*connStepSize;
|
|
} else {
|
|
ncclShmem.groups[group].dsts[1] = ncclShmem.groups[group].srcs[0]; // Already done
|
|
}
|
|
if (postRecv) step += StepPerSlice;
|
|
}
|
|
if (sendPow2 >= 0 && sendPow2 == index && (flags & RoleWaitSend)) {
|
|
int spins = 0;
|
|
while (connStepCache + NCCL_STEPS < step + StepPerSlice) {
|
|
connStepCache = loadStepValue(connStepPtr);
|
|
if (checkAbort(spins)) break;
|
|
}
|
|
ncclShmem.groups[group].dsts[0] = (T*)(connEltsFifo + (step%NCCL_STEPS)*connStepSize) + sendOffset;
|
|
if (postSend) {
|
|
if (flags & ConnFifoEnabled)
|
|
connFifo[step%NCCL_STEPS].size = (sendOffset + nelem)*sizeof(T);
|
|
step += StepPerSlice;
|
|
}
|
|
}
|
|
if (recvPow2 < 0 && (flags & RoleInput)) { // Source is our own local buffer
|
|
ncclShmem.groups[group].srcs[0] = userInput + inpIx;
|
|
if (accSize < inpIx + nelem) {
|
|
// New data, copy to our output buffer.
|
|
ncclShmem.groups[group].dsts[1] = userOutput + outIx;
|
|
accSize = inpIx + nelem;
|
|
} else {
|
|
ncclShmem.groups[group].dsts[1] = ncclShmem.groups[group].srcs[0]; // Already done
|
|
}
|
|
}
|
|
barrier();
|
|
int nDsts = 2;
|
|
void** dsts = ncclShmem.groups[group].dsts;
|
|
if (sendPow2 < 0) { dsts++; nDsts--; } // No peer to send to, remove one dest
|
|
if (ncclShmem.groups[group].srcs[0] == ncclShmem.groups[group].dsts[1]) nDsts--; // In-place or already done.
|
|
|
|
int workSize = ncclShmem.aborted ? 0 : nelem;
|
|
|
|
reduceCopy<Unroll, RedOp, T, 0, 1, 1, 0, 1, 2, /*PreOpSrcs*/0>
|
|
(tid, nthreads, ncclShmem.redOpArgs[0], nullptr, /*postOp=*/false,
|
|
1, ncclShmem.groups[group].srcs, nDsts, dsts, workSize);
|
|
|
|
barrier();
|
|
if (postRecv && recvPow2 >= 0 && recvPow2 == index && (flags & RolePostRecv)) postPeer<1, 0>(0 < nelem);
|
|
if (postSend && sendPow2 >= 0 && sendPow2 == index && (flags & RolePostSend)) postPeer<0, 1>(0 < nelem);
|
|
}
|
|
|
|
};
|