John Bachan
29f4114f02
This ensures non-pow2 ranks have buffer addresses aligned suitably for performance.
119 satır
4.1 KiB
Plaintext
119 satır
4.1 KiB
Plaintext
/*************************************************************************
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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 "cuda_runtime.h"
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#include "common.h"
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#define ALIGN 4
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void HyperCubeGetCollByteCount(size_t *sendcount, size_t *recvcount, size_t *paramcount, size_t *sendInplaceOffset, size_t *recvInplaceOffset, size_t count, size_t eltSize, int nranks) {
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size_t base = (count/nranks) & -(16/eltSize);
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*sendcount = base;
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*recvcount = base*nranks;
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*sendInplaceOffset = base;
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*recvInplaceOffset = 0;
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*paramcount = base;
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}
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testResult_t HyperCubeInitData(struct threadArgs* args, ncclDataType_t type, ncclRedOp_t op, int root, int rep, int in_place) {
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size_t sendcount = args->sendBytes / wordSize(type);
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size_t recvcount = args->expectedBytes / wordSize(type);
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int nranks = args->nProcs*args->nThreads*args->nGpus;
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for (int i=0; i<args->nGpus; i++) {
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CUDACHECK(cudaSetDevice(args->gpus[i]));
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int rank = ((args->proc*args->nThreads + args->thread)*args->nGpus + i);
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CUDACHECK(cudaMemset(args->recvbuffs[i], 0, args->expectedBytes));
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void* data = in_place ? ((char*)args->recvbuffs[i])+rank*args->sendBytes : args->sendbuffs[i];
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TESTCHECK(InitData(data, sendcount, 0, type, ncclSum, 33*rep + rank, 1, 0));
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for (int j=0; j<nranks; j++) {
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TESTCHECK(InitData((char*)args->expected[i] + args->sendBytes*j, sendcount, 0, type, ncclSum, 33*rep + j, 1, 0));
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}
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CUDACHECK(cudaDeviceSynchronize());
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}
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return testSuccess;
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}
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void HyperCubeGetBw(size_t count, int typesize, double sec, double* algBw, double* busBw, int nranks) {
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double baseBw = (double)(count * typesize * (nranks - 1)) / 1.0E9 / sec;
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*algBw = baseBw;
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double factor = 1;
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*busBw = baseBw * factor;
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}
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testResult_t HyperCubeRunColl(void* sendbuff, void* recvbuff, size_t count, ncclDataType_t type, ncclRedOp_t op, int root, ncclComm_t comm, cudaStream_t stream) {
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char* sbuff = (char*)sendbuff;
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char* rbuff = (char*)recvbuff;
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int nRanks;
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NCCLCHECK(ncclCommCount(comm, &nRanks));
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int rank;
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NCCLCHECK(ncclCommUserRank(comm, &rank));
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size_t rankSize = count * wordSize(type);
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if (rbuff+rank*rankSize != sbuff) CUDACHECK(cudaMemcpyAsync(rbuff+rank*rankSize, sbuff, rankSize, cudaMemcpyDeviceToDevice, stream));
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// Hypercube AllGather
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for (int mask=1; mask<nRanks; mask<<=1) {
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NCCLCHECK(ncclGroupStart());
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int s = rank & ~(mask-1);
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int r = s ^ mask;
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NCCLCHECK(ncclSend(rbuff+s*rankSize, count*mask, type, rank^mask, comm, stream));
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NCCLCHECK(ncclRecv(rbuff+r*rankSize, count*mask, type, rank^mask, comm, stream));
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NCCLCHECK(ncclGroupEnd());
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}
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return testSuccess;
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}
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struct testColl hyperCubeTest = {
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"HyperCube",
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HyperCubeGetCollByteCount,
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HyperCubeInitData,
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HyperCubeGetBw,
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HyperCubeRunColl
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};
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void HyperCubeGetBuffSize(size_t *sendcount, size_t *recvcount, size_t count, int nranks) {
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size_t paramcount, sendInplaceOffset, recvInplaceOffset;
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HyperCubeGetCollByteCount(sendcount, recvcount, ¶mcount, &sendInplaceOffset, &recvInplaceOffset, count, /*eltSize=*/1, nranks);
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}
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testResult_t HyperCubeRunTest(struct threadArgs* args, int root, ncclDataType_t type, const char* typeName, ncclRedOp_t op, const char* opName) {
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args->collTest = &hyperCubeTest;
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ncclDataType_t *run_types;
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const char **run_typenames;
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int type_count;
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if ((int)type != -1) {
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type_count = 1;
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run_types = &type;
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run_typenames = &typeName;
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} else {
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type_count = test_typenum;
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run_types = test_types;
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run_typenames = test_typenames;
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}
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// Check if this is a power of 2
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int nRanks = args->nProcs*args->nThreads*args->nGpus;
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if (nRanks && !(nRanks & (nRanks - 1))) {
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for (int i=0; i<type_count; i++) {
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TESTCHECK(TimeTest(args, run_types[i], run_typenames[i], (ncclRedOp_t)0, "", -1));
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}
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} else {
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printf("nRanks %d is not a power of 2, skipping\n", nRanks);
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}
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return testSuccess;
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}
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struct testEngine hyperCubeEngine = {
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HyperCubeGetBuffSize,
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HyperCubeRunTest
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};
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#pragma weak ncclTestEngine=hyperCubeEngine
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