Sylvain Jeaugey
68b542363f
Add scalable init API * Add new ncclCommInitRankScalable to allow for passing multiple unique IDs to the init function. * Spreads the load onto multiple bootstrap roots, allowing for constant bootstrap time. * Requires multiple ranks to create a unique ID, and the CPU-side ID exchange code to call allgather[v] instead of broadcast. Accelerate init bootstrap operations * Reduce the number of calls to allgather. * Allow roots to reply early to ranks when information is already available. * Add an option to use ncclNet instead of sockets to perform bootstrap allgather operations. Add PAT algorithms for Allgather and ReduceScatter * Parallel Aggregated Trees, variation of Bruck algorithm. * Logarithmic number of network steps for small sizes at scale. * Only supports one rank per node at the moment. Add support for registered buffers for intra-node communication. * Allow registered user buffers to be accessed directly intra-node * Avoids extra copies in algorithms which permit it, saving memory bandwidth and helping with compute overlap. Add profiler plugin API * New plugin API for profiling * Supports various levels of profiling, with a hierarchy. Asynchronous graph allocation * Make calls to cudaMalloc and cudaMemcpy during graph allocation asynchronous. * Significantly speeds up graph capture. Use fatal IB asynchronous events to stop network operation * Avoids many other error messages * Only fatal errors are affected; potentially transient errors (e.g. port down) do not cause an immediate stop. Set P2P level to PXB on AMD CPUs when using more than 2 GPUs per node * P2P would cause a significant performance degradation when using many GPUs, and therefore many interleaved data flows. * Disable P2P through the CPU when we have 3+ GPUs per node; keep it enabled when we only have 2 GPUs. Improve the init logs to report the real NCCL function. * Make the log report ncclCommInitRank or ncclCommSplit, rather than the generic ncclCommInitRankFunc. Add a parameter to set the location of the user configuration file. * Add NCCL_CONF_FILE environment variable to set where the user's configuration file resides. Increase default IB timeout * Increase IB timeout value from 18 to 20. * Should help avoid fatal errors on large RoCE systems. Add new check for nvidia peermem * On linux kernels 6.6+, /sys/kernel/mm/memory_peers is no longer present; check for /sys/module/nvidia_peermem/version instead. Fix old performance regression when mixing small and large operations. * Improves distribution of work on channels. Fix crash when NUMA IDs are equal to -1. * Can happen when a NIC is a virtual NIC, or when linux doesn't know which NUMA node a device is attached to * Issue NVIDIA/nccl-tests#233 Fix tree graph search when NCCL_CROSS_NIC is set to 1. * Would force NCCL to use the balanced_tree pattern, thereby disabling LL128 on platforms with 1 GPU+1 NIC per PCI switch. * Would also try to use alternate rings even though it was not needed. Compiler tweaks and fixes * PR #1177 * PR #1228 Fix stack smash * PR #1325 Fixes for multi-node NVLink + IB operation Coverity fixes and comments.
97 rivejä
3.3 KiB
C
97 rivejä
3.3 KiB
C
/*************************************************************************
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* Copyright (c) 2023, NVIDIA CORPORATION. All rights reserved.
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* Copyright (c) 2023, Meta Platforms, Inc. and affiliates.
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*
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* See LICENSE.txt for license information
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************************************************************************/
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#ifndef NCCL_TUNER_H_
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#define NCCL_TUNER_H_
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#include <stdint.h>
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#include <stdlib.h>
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#include "common.h"
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#include "err.h"
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#define NCCL_NUM_FUNCTIONS 5 // Send/Recv not included for now
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typedef enum {
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ncclFuncBroadcast = 0,
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ncclFuncReduce = 1,
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ncclFuncAllGather = 2,
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ncclFuncReduceScatter = 3,
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ncclFuncAllReduce = 4,
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ncclFuncSendRecv = 5,
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ncclFuncSend = 6,
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ncclFuncRecv = 7,
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ncclNumFuncs = 8
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} ncclFunc_t;
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#define NCCL_NUM_ALGORITHMS 7 // Tree/Ring/CollNet*
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#define NCCL_ALGO_UNDEF -1
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#define NCCL_ALGO_TREE 0
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#define NCCL_ALGO_RING 1
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#define NCCL_ALGO_COLLNET_DIRECT 2
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#define NCCL_ALGO_COLLNET_CHAIN 3
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#define NCCL_ALGO_NVLS 4
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#define NCCL_ALGO_NVLS_TREE 5
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#define NCCL_ALGO_PAT 6
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#define NCCL_NUM_PROTOCOLS 3 // Simple/LL/LL128
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#define NCCL_PROTO_UNDEF -1
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#define NCCL_PROTO_LL 0
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#define NCCL_PROTO_LL128 1
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#define NCCL_PROTO_SIMPLE 2
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#define NCCL_ALGO_PROTO_IGNORE -1.0
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// API to be implemented by external tuner
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typedef struct {
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// Name of the tuner
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const char* name;
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// Initializes tuner states.
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// Inputs:
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// - nRanks: number of ranks in current communicator. Each communicator initialize its own tuner.
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// - nNodes: number of nodes in current communicator.
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// - logFunction: a logFunction can be useful to integrate logging together with NCCL core.
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// Outputs:
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// - context: tuner context object
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ncclResult_t (*init)(size_t nRanks, size_t nNodes, ncclDebugLogger_t logFunction, void **context);
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// Gets info (algo, protocol, number of ctas and threads) for a given collective.
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// Inputs:
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// - context: tuner context object
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// - collType: collective type , e.g., allreduce, allgather…
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// - nBytes: collective size in bytes
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// - numPipeOps: number of operations in the group
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// - numAlgo: number of algorithms in collCostTable
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// - numProto: number of protocols in collCostTable
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//
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// Outputs:
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// - nChannels: number of channels (hence SMs) to be used.
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//
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// InOut:
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// - collCostTable: collective cost table, generated by NCCL core, containing algo|proto|time entries for collType.
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// NCCL core sets ignored algo/proto cost table entries to -1.0 (NCCL_ALGO_PROTO_IGNORE).
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//
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// If getCollInfo() does not return ncclSuccess, NCCL will fall back to the
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// default tuning for the given collective.
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// Also, the plugin is allowed to not set any output, or set only the
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// algorithm and protocol, but not only the algorithm or only the protocol.
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// Unset fields will be set automatically by NCCL.
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ncclResult_t (*getCollInfo)(void* context, ncclFunc_t collType, size_t nBytes,
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int numPipeOps, float** collCostTable, int numAlgo, int numProto,
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int* nChannels);
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// Terminates the plugin and cleans up any resources that the plugin allocated.
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// context: tuner context object
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ncclResult_t (*destroy)(void* context);
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} ncclTuner_v3_t;
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typedef ncclTuner_v3_t ncclTuner_t;
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#define NCCL_TUNER_PLUGIN_SYMBOL "ncclTunerPlugin_v3"
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#endif
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