Wenkai Du
524 строки
29 KiB
C++
524 строки
29 KiB
C++
/*************************************************************************
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* Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
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* Modifications Copyright (c) 2019-2022 Advanced Micro Devices, Inc. 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 "core.h"
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#include "devcomm.h"
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#include "comm.h"
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#include "topo.h"
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NCCL_PARAM(Nthreads, "NTHREADS", -2);
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NCCL_PARAM(Ll128Nthreads, "LL128_NTHREADS", -2);
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static int getNthreads(const char* name, int env, int min, int max, int def, int WarpSize) {
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int nt = env;
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if (nt > 0) {
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if (nt % WarpSize != 0) {
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WARN("Invalid %s %d (must be a multiple of %d)", name, nt, WarpSize);
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nt = max;
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} else if (nt > max) {
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WARN("Invalid %s %d (maximum %d).", name, nt, max);
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nt = max;
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} else if (nt < min) {
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WARN("Invalid %s %d (minimum %d).", name, nt, min);
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nt = min;
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}
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} else {
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nt = def;
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}
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return nt;
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}
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ncclResult_t parseList(const char* str, const char* elems[], int nelems, int* list) {
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int def, set;
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if (str[0] == '^') {
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def = 1; set = 0; str++;
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} else {
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def = 0; set = 1;
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}
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for (int i=0; i<nelems; i++) list[i] = def;
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char* tokStr = strdup(str);
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char* tmpStr;
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char* token = strtok_r(tokStr, ",", &tmpStr);
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while (token) {
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for (int i=0; i<nelems; i++)
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if (strcasecmp(token, elems[i]) == 0) list[i] = set;
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token = strtok_r(NULL, ",", &tmpStr);
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}
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free(tokStr);
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return ncclSuccess;
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}
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// Latencies in us, Bandwidths in GB/s
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// Tree { LL, LL128, Simple } , Ring { LL, LL128, Simple }
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static const float baseLat [NCCL_NUM_ALGORITHMS][NCCL_NUM_PROTOCOLS] = { { 12.0, 12.0, 17.0 }, { 12.0, 12.0, 17.0 }, { 12.0, 12.0, 17.0 }, { 12.0, 12.0, 17.0 } };
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// NVLink, PCI, Network
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#define NCCL_HW_NVLINK 0
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#define NCCL_HW_PCI 1
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#define NCCL_HW_NET 2
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struct tuningModel {
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float hwLat [3][NCCL_NUM_ALGORITHMS][NCCL_NUM_PROTOCOLS];
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float bwRatio [2][NCCL_NUM_ALGORITHMS][NCCL_NUM_PROTOCOLS];
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float treeCorrectionFactor[NCCL_NUM_PROTOCOLS][27];
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float ringCorrectionFactor[NCCL_NUM_PROTOCOLS][27];
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};
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static struct tuningModel tuning_model_0 {
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.hwLat = {
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/* NVLINK */
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{ /* Tree (LL/LL128/Simple)*/ { 0.8, 1.4, 2.5 }, /* Ring (LL/LL128/Simple)*/ { 0.8, 2.2, 3.6 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 0.8 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 1.4 }, /* NVLS */ { 0, 0, 0 } },
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/* PCI */
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{ /* Tree (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* Ring (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 5.7 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 5.7 }, /* NVLS */ { 0, 0, 0 } },
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/* NET */
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{ /* Tree (LL/LL128/Simple)*/ { 11.8, 18.2, 20.8 }, /* Ring (LL/LL128/Simple)*/ { 9.5, 19.8, 15.1 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 11.8 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 18.2 }, /* NVLS */ { 0, 0, 0 } },
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},
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.bwRatio = {
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/* 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.04, 0.22, 0.91 }, /* Ring (LL/LL128/Simple)*/ { 0.04, 0.34, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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/* more than 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.04, 0.22, 0.95 }, /* Ring (LL/LL128/Simple)*/ { 0.04, 0.34, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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},
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.treeCorrectionFactor = {
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{ 0.1, 0.2, 0.1, 0.1, 0.9, 0.3, 0.4, 0.1, 0.2, 0.4, 0.2, 0.1, 0.3, 0.3, 0.2, 0.2, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, },
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{ 0.1, 0.3, 1.0, 0.1, 0.5, 1.0, 0.9, 1.0, 1.0, 1.0, 0.3, 0.1, 0.4, 0.5, 0.5, 0.4, 0.4, 0.3, 0.3, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, },
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{ 0.2, 1.0, 0.1, 0.1, 0.7, 0.2, 0.4, 0.1, 0.1, 0.3, 0.4, 0.3, 0.6, 0.8, 1.0, 1.0, 1.0, 1.0, 0.9, 0.8, 0.8, 0.8, 0.8, 0.8, 0.9, 0.9, 0.9, },
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},
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.ringCorrectionFactor = {
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.4, 0.2, 0.3, 0.5, 0.3, 0.1, 0.5, 0.5, 0.3, 0.2, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, },
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.3, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.8, 0.7, 0.5, 0.4, 0.4, 0.3, 0.3, 0.3, 0.3, 0.3, 0.3, },
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{ 1.0, 0.8, 0.2, 1.0, 1.0, 0.3, 1.0, 0.1, 0.1, 0.2, 0.2, 0.1, 0.5, 1.0, 0.8, 0.8, 1.0, 0.9, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, },
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},
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};
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static struct tuningModel tuning_model_1 {
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.hwLat =
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{ /* NVLINK */
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{ /* Tree (LL/LL128/Simple)*/ { 1.5, 1.5, 4.5 }, /* Ring (LL/LL128/Simple)*/ { 1.5, 1.5, 4.5 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 4.5 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 4.5 }, /* NVLS */ { 0, 0, 0 } },
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/* PCI */
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{ /* Tree (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* Ring (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 5.7 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 5.7 }, /* NVLS */ { 0, 0, 0 } },
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/* NET */
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{ /* Tree (LL/LL128/Simple)*/ { 33.0, 33.0, 15.8 }, /* Ring (LL/LL128/Simple)*/ { 5.1, 5.1, 68.8 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 15.8 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 15.8 }, /* NVLS */ { 0, 0, 0 } },
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},
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.bwRatio =
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{ /* 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.12, 1.00, 0.99 }, /* Ring (LL/LL128/Simple)*/ { 0.12, 1.00, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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/* more than 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.15, 1.00, 0.42 }, /* Ring (LL/LL128/Simple)*/ { 0.20, 1.00, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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},
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.treeCorrectionFactor = {
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{ 0.5, 0.4, 0.7, 0.6, 1.0, 1.0, 0.5, 0.4, 0.1, 0.5, 0.4, 0.6, 1.0, 1.0, 1.0, 1.0, 1.0, 0.8, 0.6, 0.5, 0.4, 0.4, 0.3, 0.2, 0.1, 0.1, 0.1, },
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{ 0.5, 0.4, 0.7, 0.6, 1.0, 1.0, 0.5, 0.4, 0.1, 0.5, 0.4, 0.6, 1.0, 1.0, 1.0, 1.0, 1.0, 0.8, 0.6, 0.5, 0.4, 0.4, 0.3, 0.2, 0.1, 0.1, 0.1, },
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.3, 0.4, 0.5, 0.1, 0.6, 1.0, 1.0, 1.0, 0.6, 0.5, 0.7, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.7, 0.5, 0.3, 0.3, },
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},
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.ringCorrectionFactor = {
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{ 1.0, 0.5, 1.0, 1.0, 0.6, 0.7, 1.0, 1.0, 0.2, 1.0, 0.9, 0.7, 1.0, 1.0, 1.0, 0.9, 0.9, 0.8, 0.8, 0.7, 0.6, 0.5, 0.5, 0.3, 0.2, 0.1, 0.1, },
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{ 1.0, 0.5, 1.0, 1.0, 0.6, 0.7, 1.0, 1.0, 0.2, 1.0, 0.9, 0.7, 1.0, 1.0, 1.0, 0.9, 0.9, 0.8, 0.8, 0.7, 0.6, 0.5, 0.5, 0.3, 0.2, 0.1, 0.1, },
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{ 0.3, 1.0, 0.3, 0.1, 0.1, 0.1, 0.3, 0.7, 1.0, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.3, 0.5, 0.9, 1.0, 1.0, 1.0, 1.0, },
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},
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};
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static struct tuningModel tuning_model_2 {
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.hwLat = {
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/* NVLINK */
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{ /* Tree (LL/LL128/Simple)*/ { 1.5, 1.5, 4.5 }, /* Ring (LL/LL128/Simple)*/ { 1.5, 1.5, 4.5 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 4.5 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 4.5 }, /* NVLS */ { 0, 0, 0 } },
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/* PCI */
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{ /* Tree (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* Ring (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 5.7 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 5.7 }, /* NVLS */ { 0, 0, 0 } },
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/* NET */
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{ /* Tree (LL/LL128/Simple)*/ { 27.9, 27.9, 15.8 }, /* Ring (LL/LL128/Simple)*/ { 12.1, 12.1, 68.8 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 15.8 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 15.8 }, /* NVLS */ { 0, 0, 0 } },
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},
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.bwRatio = {
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/* 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.07, 1.00, 0.99 }, /* Ring (LL/LL128/Simple)*/ { 0.08, 1.00, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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/* more than 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.07, 1.00, 0.42 }, /* Ring (LL/LL128/Simple)*/ { 0.08, 1.00, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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},
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.treeCorrectionFactor = {
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{ 0.1, 0.4, 0.3, 0.3, 0.2, 0.4, 0.5, 0.1, 0.1, 0.6, 0.7, 0.7, 0.8, 1.0, 0.9, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, },
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{ 0.1, 0.4, 0.3, 0.3, 0.2, 0.4, 0.5, 0.1, 0.1, 0.6, 0.7, 0.7, 0.8, 1.0, 0.9, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, },
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{ 1.0, 0.1, 0.1, 0.1, 0.1, 0.2, 0.3, 0.5, 0.1, 0.6, 0.9, 0.8, 0.7, 0.9, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.7, 0.9, 0.9, 1.0, 1.0, 1.0, },
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},
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.ringCorrectionFactor = {
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{ 0.1, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.4, 1.0, 1.0, 1.0, 1.0, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, },
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{ 0.1, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.4, 1.0, 1.0, 1.0, 1.0, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, },
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 1.0, 0.2, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.4, 0.5, 0.6, 0.9, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, },
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},
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};
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static struct tuningModel tuning_model_3 {
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.hwLat = {
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/* NVLINK */
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{ /* Tree (LL/LL128/Simple)*/ { 0.8, 0.0, 2.5 }, /* Ring (LL/LL128/Simple)*/ { 0.8, 0.0, 3.6 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 0.8 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 0.0 }, /* NVLS */ { 0, 0, 0 } },
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/* PCI */
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{ /* Tree (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* Ring (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 5.7 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 5.7 }, /* NVLS */ { 0, 0, 0 } },
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/* NET */
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{ /* Tree (LL/LL128/Simple)*/ { 12.5, 0.0, 22.4 }, /* Ring (LL/LL128/Simple)*/ { 9.5, 0.0, 19.8 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 12.5 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 0.0 }, /* NVLS */ { 0, 0, 0 } },
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},
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.bwRatio = {
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/* 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.20, 0.00, 1.75 }, /* Ring (LL/LL128/Simple)*/ { 0.20, 0.00, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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/* more than 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.20, 0.00, 0.96 }, /* Ring (LL/LL128/Simple)*/ { 0.20, 0.00, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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},
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.treeCorrectionFactor = {
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 1.0, 1.0, 0.2, 1.0, 0.9, 1.0, 0.6, 0.4, 0.6, 0.4, 0.3, 0.3, 0.3, 0.3, 0.3, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, },
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, },
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{ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.1, 0.1, 0.1, 0.2, 1.0, 0.8, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.8, 0.7, 0.8, 0.9, 0.7, 0.7, },
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},
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.ringCorrectionFactor = {
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.3, 0.1, 0.2, 0.1, 0.4, 0.4, 0.2, 0.2, 0.3, 0.7, 0.5, 0.4, 0.3, 0.3, 0.3, 0.3, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, },
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, },
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.5, 1.0, 0.1, 0.3, 0.1, 0.1, 0.1, 0.2, 0.2, 0.2, 0.3, 0.4, 0.7, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, },
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},
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};
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static struct tuningModel tuning_model_4 {
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.hwLat = {
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/* NVLINK */
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{ /* Tree (LL/LL128/Simple)*/ { 0.8, 1.4, 2.5 }, /* Ring (LL/LL128/Simple)*/ { 0.8, 2.2, 3.6 }, /* CollNetDirect (Simple)*/ { 0.8, 1.4, 2.5 }, /* CollNetChain (Simple)*/ { 0.8, 1.4, 2.5 } },
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/* PCI */
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{ /* Tree (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* Ring (LL/LL128/Simple)*/ { 2.2, 2.2, 5.7 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 5.7 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 5.7 }, /* NVLS */ { 0, 0, 0 } },
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/* NET */
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{ /* Tree (LL/LL128/Simple)*/ { 32.2, 34.4, 47.6 }, /* Ring (LL/LL128/Simple)*/ { 35.4, 87.8, 209.2 }, /* CollNetDirect (Simple)*/ { 0.0, 0.0, 47.6 }, /* CollNetChain (Simple)*/ { 0.0, 0.0, 47.6 } },
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},
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.bwRatio = {
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/* 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.16, 1.09, 1.61 }, /* Ring (LL/LL128/Simple)*/ { 0.15, 0.41, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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/* more than 2 nodes */
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{ /* Tree (LL/LL128/Simple)*/ { 0.16, 1.09, 1.08 }, /* Ring (LL/LL128/Simple)*/ { 0.15, 0.41, 1.00 }, /* CollNetDirect (Simple)*/ { 0.00, 0.00, 1.00 }, /* CollNetChain (Simple)*/ { 0.00, 0.00, 1.00 }, /* NVLS */ { 0, 0, 0 } },
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},
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.treeCorrectionFactor = {
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 1.0, 0.1, 0.1, 0.2, 0.4, 0.6, 0.5, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, },
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{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.1, 0.1, 0.2, 1.0, 0.5, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, },
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{ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.8, 0.4, 0.3, 0.3, 0.1, 0.1, 1.0, 1.0, 0.7, 0.5, 0.6, 0.5, 0.6, 0.6, 0.5, 0.6, 0.6, 0.6, 0.7, },
|
|
},
|
|
|
|
.ringCorrectionFactor = {
|
|
{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.2, 0.1, 0.3, 0.1, 0.1, 0.1, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, },
|
|
{ 0.4, 0.5, 0.5, 0.4, 0.4, 0.4, 0.4, 0.2, 0.2, 0.1, 0.3, 1.0, 1.0, 0.7, 0.8, 0.5, 1.0, 1.0, 1.0, 1.0, 1.0, 0.9, 0.8, 0.5, 0.4, 0.3, 0.3, },
|
|
{ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 1.0, 1.0, 0.8, 0.5, 0.1, 0.7, 0.2, 0.4, 0.4, 0.6, 0.7, 0.9, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, },
|
|
},
|
|
};
|
|
|
|
static struct tuningModel rcclTuningModel[] = {
|
|
tuning_model_0,
|
|
tuning_model_1,
|
|
tuning_model_2,
|
|
tuning_model_3,
|
|
tuning_model_4,
|
|
};
|
|
|
|
/* Array indexes used below */
|
|
#define VOLTA_COMPCAP_IDX 0
|
|
#define AMPERE_COMPCAP_IDX 1
|
|
#define HOPPER_COMPCAP_IDX 2
|
|
|
|
// LL128 max BW per channel
|
|
static const double ll128MaxBwPerCh[3] = { 20.0, 20.0, 36.7 };
|
|
static const double llMaxBws[3][3] = {
|
|
/* Volta-N1/Intel-N2/Intel-N4) */ {39.0, 39.0, 20.4},
|
|
/* Ampere-N1/AMD-N2/AMD-N4) */ {87.7, 22.5 /*avg of ring & tree*/, 19.0},
|
|
/* Hopper-N1/AMD-N2/AMD-N4) */ {87.7, 22.5 /*avg of ring & tree*/, 19.0}
|
|
};
|
|
|
|
static const double perChMaxTreeBws[3][3] = {
|
|
/* Volta (N1/N2/N4) */ {26.5, 18.5, 10.0},
|
|
/* Ampere (N1/N2/N4) */ {24.0, 23.6, 17.8},
|
|
/* Hopper (N1/N2/N4) */ {38.7, 41.4, 33.0},
|
|
};
|
|
|
|
ncclResult_t ncclTopoTuneModel(struct ncclComm* comm, int minCompCap, int maxCompCap, struct ncclTopoGraph* treeGraph, struct ncclTopoGraph* ringGraph, struct ncclTopoGraph* collNetGraph) {
|
|
int simpleDefaultThreads = (ringGraph->bwIntra*ringGraph->nChannels <= PCI_BW) ? 256 : NCCL_SIMPLE_MAX_NTHREADS;
|
|
comm->maxThreads[NCCL_ALGO_RING][NCCL_PROTO_SIMPLE] =
|
|
#if defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
|
|
getNthreads("NCCL_NTHREADS", ncclParamNthreads(), 4*comm->WarpSize, NCCL_MAX_NTHREADS, simpleDefaultThreads, comm->WarpSize);
|
|
comm->maxThreads[NCCL_ALGO_TREE][NCCL_PROTO_SIMPLE] = comm->maxThreads[NCCL_ALGO_COLLNET_DIRECT][NCCL_PROTO_SIMPLE] =
|
|
getNthreads("NCCL_NTHREADS", ncclParamNthreads(), 4*comm->WarpSize, NCCL_MAX_NTHREADS, NCCL_MAX_NTHREADS, comm->WarpSize);
|
|
comm->maxThreads[NCCL_ALGO_RING][NCCL_PROTO_LL] = comm->maxThreads[NCCL_ALGO_TREE][NCCL_PROTO_LL] = comm->maxThreads[NCCL_ALGO_COLLNET_DIRECT][NCCL_PROTO_LL] =
|
|
getNthreads("NCCL_NTHREADS", ncclParamNthreads(), 4*comm->WarpSize, NCCL_MAX_NTHREADS, NCCL_MAX_NTHREADS, comm->WarpSize);
|
|
comm->maxThreads[NCCL_ALGO_RING][NCCL_PROTO_LL128] = comm->maxThreads[NCCL_ALGO_TREE][NCCL_PROTO_LL128] =
|
|
getNthreads("NCCL_LL128_NTHREADS", ncclParamLl128Nthreads(), 4*comm->WarpSize, NCCL_LL128_MAX_NTHREADS, NCCL_LL128_MAX_NTHREADS, comm->WarpSize);
|
|
#else
|
|
getNthreads("NCCL_NTHREADS", ncclParamNthreads(), 2*WARP_SIZE, NCCL_SIMPLE_MAX_NTHREADS, simpleDefaultThreads);
|
|
comm->maxThreads[NCCL_ALGO_TREE][NCCL_PROTO_SIMPLE] =
|
|
getNthreads("NCCL_NTHREADS", ncclParamNthreads(), 2*WARP_SIZE, NCCL_SIMPLE_MAX_NTHREADS, NCCL_SIMPLE_MAX_NTHREADS);
|
|
comm->maxThreads[NCCL_ALGO_COLLNET_DIRECT][NCCL_PROTO_SIMPLE] =
|
|
comm->maxThreads[NCCL_ALGO_COLLNET_CHAIN][NCCL_PROTO_SIMPLE] =
|
|
comm->maxThreads[NCCL_ALGO_NVLS][NCCL_PROTO_SIMPLE] = NCCL_SIMPLE_MAX_NTHREADS;
|
|
comm->maxThreads[NCCL_ALGO_RING][NCCL_PROTO_LL] = comm->maxThreads[NCCL_ALGO_TREE][NCCL_PROTO_LL] =
|
|
getNthreads("NCCL_NTHREADS", ncclParamNthreads(), 2*WARP_SIZE, NCCL_LL_MAX_NTHREADS, NCCL_LL_MAX_NTHREADS);
|
|
comm->maxThreads[NCCL_ALGO_RING][NCCL_PROTO_LL128] = comm->maxThreads[NCCL_ALGO_TREE][NCCL_PROTO_LL128] =
|
|
getNthreads("NCCL_LL128_NTHREADS", ncclParamLl128Nthreads(), NCCL_LL128_MAX_NTHREADS/4, NCCL_LL128_MAX_NTHREADS, NCCL_LL128_MAX_NTHREADS);
|
|
#endif
|
|
|
|
int nNodes = comm->nNodes;
|
|
int nRanks = comm->nRanks;
|
|
if (nRanks <= 1) return ncclSuccess;
|
|
|
|
int compCapIndex = minCompCap >= 90 ? HOPPER_COMPCAP_IDX : minCompCap >= 80 ? AMPERE_COMPCAP_IDX : VOLTA_COMPCAP_IDX;
|
|
int cpuArch, cpuVendor, cpuModel;
|
|
NCCLCHECK(ncclTopoCpuType(comm->topo, &cpuArch, &cpuVendor, &cpuModel));
|
|
int index2 = nNodes <= 2 ? nNodes-1 : 2;
|
|
// LL: for single node, we look at GPU type; for multi-node, we look at CPU type
|
|
int index1 = nNodes == 1 ? compCapIndex : cpuVendor == NCCL_TOPO_CPU_VENDOR_AMD ? 1 : 0;
|
|
double llMaxBw = llMaxBws[index1][index2];
|
|
double perChMaxTreeBw = perChMaxTreeBws[compCapIndex][index2];
|
|
// De-penalize Tree/Simple latency on Power systems to favor Tree than Ring
|
|
//if (cpuArch == NCCL_TOPO_CPU_ARCH_POWER) hwLat[NCCL_HW_PCI][NCCL_ALGO_TREE][NCCL_PROTO_SIMPLE] = hwLat[NCCL_HW_PCI][NCCL_ALGO_RING][NCCL_PROTO_SIMPLE];
|
|
float ppn = (float)nRanks / nNodes; // if ppn < 2, then we are sending/receiving at the same GPU through the NIC, apply some bw discount
|
|
|
|
struct ncclTopoGraph* graphs[NCCL_NUM_ALGORITHMS] = { treeGraph, ringGraph, collNetGraph, collNetGraph, ringGraph/* we only need the NVSwitch speed for NVLS*/ };
|
|
int intraHw[NCCL_NUM_ALGORITHMS], hw[NCCL_NUM_ALGORITHMS];
|
|
for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) intraHw[a] = graphs[a]->typeIntra == LINK_NVL ? NCCL_HW_NVLINK : NCCL_HW_PCI;
|
|
for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) hw[a] = nNodes == 1 ? intraHw[a] : NCCL_HW_NET;
|
|
|
|
for (int coll=0; coll<NCCL_NUM_FUNCTIONS; coll++) {
|
|
int nsteps = coll == ncclFuncAllReduce ? 2*(nRanks-1) :
|
|
coll == ncclFuncReduceScatter || coll == ncclFuncAllGather ? nRanks-1 :
|
|
nRanks;
|
|
int nInterSteps = coll == ncclFuncAllReduce ? (nNodes > 1 ? 2*nNodes :0) :
|
|
coll == ncclFuncReduceScatter || coll == ncclFuncAllGather ? nNodes-1 :
|
|
nNodes;
|
|
|
|
for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) {
|
|
if ((coll != ncclFuncAllReduce) && a != NCCL_ALGO_RING) continue;
|
|
|
|
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
|
|
if (a == NCCL_ALGO_NVLS && p != NCCL_PROTO_SIMPLE) continue;
|
|
int collnet = (a == NCCL_ALGO_COLLNET_DIRECT || a == NCCL_ALGO_COLLNET_CHAIN) ? 1 : 0;
|
|
float bw = nNodes <= 2 || collnet ? graphs[a]->bwIntra : graphs[a]->bwInter;
|
|
float busBw = comm->topo->baseBw != 0.0 ? comm->topo->baseBw : graphs[a]->nChannels * bw;
|
|
//INFO(NCCL_INIT, "algo %s proto %s busBw %f baseBw %f bw %f nChannels %d bwIntra %f bwInter %f", ncclAlgoStr[a], ncclProtoStr[p], busBw, comm->topo->baseBw, bw, graphs[a]->nChannels, graphs[a]->bwIntra, graphs[a]->bwInter);
|
|
|
|
// Various model refinements
|
|
#if defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
|
|
if (nNodes <= 2)
|
|
busBw *= rcclTuningModel[comm->topo->tuning].bwRatio[0][a][p];
|
|
else
|
|
busBw *= rcclTuningModel[comm->topo->tuning].bwRatio[1][a][p];
|
|
#else
|
|
if (compCapIndex == AMPERE_COMPCAP_IDX) busBw = std::min(busBw, 235.0f);
|
|
if (compCapIndex == HOPPER_COMPCAP_IDX) busBw = std::min(busBw, 370.0f);
|
|
if (a == NCCL_ALGO_RING && p == NCCL_PROTO_LL) { busBw = std::min(llMaxBw, busBw * ((nNodes > 1 || coll == ncclFuncAllReduce || coll == ncclFuncReduce) ? 1.0/4.0 : 1.0/3.0)); }
|
|
if (a == NCCL_ALGO_RING && p == NCCL_PROTO_LL128) busBw = std::min(busBw * (ppn < 2 ? 0.7 : 0.92 /*120.0/128.0*/), ll128MaxBwPerCh[compCapIndex]*graphs[a]->nChannels);
|
|
if (a == NCCL_ALGO_TREE) busBw = std::min(busBw*.92, graphs[a]->nChannels*perChMaxTreeBw);
|
|
if (a == NCCL_ALGO_TREE && p == NCCL_PROTO_LL) busBw = std::min(busBw*1.0/3.8, llMaxBw);
|
|
if (a == NCCL_ALGO_TREE && p == NCCL_PROTO_LL128) busBw = std::min(busBw * (nNodes == 1 ? 7.0/9.0 : 120.0/128.0), ll128MaxBwPerCh[compCapIndex]*graphs[a]->nChannels);
|
|
if (a == NCCL_ALGO_COLLNET_DIRECT && p != NCCL_PROTO_SIMPLE) busBw = 0; // Not used
|
|
if (a == NCCL_ALGO_COLLNET_CHAIN && p != NCCL_PROTO_SIMPLE) busBw = 0; // Not used
|
|
if (a == NCCL_ALGO_COLLNET_DIRECT && p == NCCL_PROTO_SIMPLE) {
|
|
// Collnet+Direct requires all GPUs to have a local NIC to work at full speed
|
|
float factor = ppn / (1.0*graphs[a]->nChannels); // GPU/NIC ratio
|
|
factor -= (factor-1)/2;
|
|
busBw /= factor;
|
|
}
|
|
#endif
|
|
if (a == NCCL_ALGO_COLLNET_CHAIN && p == NCCL_PROTO_SIMPLE) busBw *= .75;
|
|
|
|
// Convert bus BW to algorithm BW
|
|
float ratio;
|
|
if (a == NCCL_ALGO_RING) ratio = (1.0 * nRanks) / nsteps;
|
|
else if (a == NCCL_ALGO_NVLS) ratio = .75;
|
|
else ratio = .5;
|
|
comm->bandwidths[coll][a][p] = busBw * ratio;
|
|
|
|
comm->latencies[coll][a][p] = baseLat[a][p];
|
|
float intraLat = rcclTuningModel[comm->topo->tuning].hwLat[intraHw[a]][a][p];
|
|
float interLat = graphs[a]->latencyInter ? graphs[a]->latencyInter : rcclTuningModel[comm->topo->tuning].hwLat[NCCL_HW_NET][a][p];
|
|
//if (nNodes > 1 && p == NCCL_PROTO_LL) intraLat *= 1.8;
|
|
if (a == NCCL_ALGO_RING) {
|
|
float lat = rcclTuningModel[comm->topo->tuning].hwLat[hw[a]][a][p];
|
|
if ((coll == ncclFuncReduce || coll == ncclFuncBroadcast)) {
|
|
if (ringGraph->sameChannels) {
|
|
comm->latencies[coll][a][p] += lat;
|
|
} else {
|
|
if (p == NCCL_PROTO_SIMPLE) lat = rcclTuningModel[comm->topo->tuning].hwLat[hw[a]][NCCL_ALGO_TREE][p]; // Add some chunk latency, waiting for proper chunk modeling
|
|
comm->latencies[coll][a][p] += nsteps*lat;
|
|
}
|
|
} else {
|
|
comm->latencies[coll][a][p] += (nsteps-nInterSteps)*intraLat + nInterSteps*interLat;
|
|
}
|
|
} else if (a == NCCL_ALGO_TREE) {
|
|
comm->latencies[coll][a][p] +=
|
|
2 * ((nRanks/nNodes-1) * intraLat + log2i(nNodes) * interLat);
|
|
} else if (a == NCCL_ALGO_COLLNET_DIRECT) {
|
|
comm->latencies[coll][a][p] +=
|
|
2 * (std::min(1, (nRanks/nNodes-1)) * intraLat + (nRanks/nNodes-1) * 0.5) + interLat; // Add 0.5 arity serialization latency
|
|
} else if (a == NCCL_ALGO_COLLNET_CHAIN) {
|
|
comm->latencies[coll][a][p] += 2 * (nRanks/nNodes-1) * intraLat;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Protocols/Algorithms enable/disable, and user overrides.
|
|
// All are enabled except ll128 which is enabled by default only in certain cases.
|
|
int protoEnable[NCCL_NUM_PROTOCOLS] = { 1, 2, 1 };
|
|
int algoEnable[NCCL_NUM_ALGORITHMS] = { 1, 1, 1, 1, 1 };
|
|
|
|
const char *protoStr = getenv("NCCL_PROTO");
|
|
if (protoStr) {
|
|
INFO(NCCL_ENV, "NCCL_PROTO set by environment to %s", protoStr);
|
|
NCCLCHECK(parseList(protoStr, ncclProtoStr, NCCL_NUM_PROTOCOLS, protoEnable));
|
|
}
|
|
const char *algoStr = getenv("NCCL_ALGO");
|
|
if (algoStr) {
|
|
INFO(NCCL_ENV, "NCCL_ALGO set by environment to %s", algoStr);
|
|
NCCLCHECK(parseList(algoStr, ncclAlgoStr, NCCL_NUM_ALGORITHMS, algoEnable));
|
|
}
|
|
|
|
// Disable NVLink SHARP if not supported
|
|
if (comm->nvlsSupport == 0 /* || comm->localRanks <= 2*/) algoEnable[NCCL_ALGO_NVLS] = 0;
|
|
|
|
// Disable CollNet if it is not supported
|
|
if (comm->collNetSupport == 0) {
|
|
algoEnable[NCCL_ALGO_COLLNET_DIRECT] = 0;
|
|
algoEnable[NCCL_ALGO_COLLNET_CHAIN] = 0;
|
|
// If user has hard set NCCL_ALGO=COLLNET, ignore it
|
|
if (algoEnable[NCCL_ALGO_RING] == 0 && algoEnable[NCCL_ALGO_TREE] == 0) {
|
|
algoEnable[NCCL_ALGO_RING] = algoEnable[NCCL_ALGO_TREE] = 1;
|
|
if (comm->rank == 0) WARN("CollNet is not supported or fails to initialize, ignoring NCCL_ALGO=COLLNET");
|
|
}
|
|
} else {
|
|
// Disable CollNet+Direct if not on an NVSwitch system
|
|
int nvsCount = 0;
|
|
NCCLCHECK(ncclTopoGetNvsCount(comm->topo, &nvsCount));
|
|
if (nvsCount == 0) algoEnable[NCCL_ALGO_COLLNET_DIRECT] = 0;
|
|
}
|
|
|
|
for (int c=0; c<NCCL_NUM_FUNCTIONS; c++) for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
|
|
int pEnable = protoEnable[p];
|
|
if (pEnable == 2 && p == NCCL_PROTO_LL128) {
|
|
#if defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
|
|
// Enable LL128 by default only on gfx90a with available tuning table
|
|
pEnable = (graphs[a]->typeInter <= PATH_PXB) && graphs[a]->typeIntra <= PATH_NVL &&
|
|
(comm->topo->nodes[GPU].nodes[0].gpu.gcn == 910 && comm->topo->ll128Enabled) ? 1 : 0;
|
|
#else
|
|
// Enable LL128 by default only on Volta/Ampere/Hopper+NVLink. Other cases are not tested and may cause silent data corruption.
|
|
pEnable = 1;
|
|
pEnable &= (graphs[a]->typeInter <= PATH_PXB || (minCompCap >= 90 && graphs[a]->typeInter <= PATH_PXN));
|
|
pEnable &= (graphs[a]->typeIntra <= PATH_NVL);
|
|
pEnable &= (minCompCap == maxCompCap);
|
|
switch (minCompCap) {
|
|
case 70: pEnable &= 1; break;
|
|
case 80: pEnable &= 1; break;
|
|
case 90: pEnable &= !(CUDART_VERSION == 11080 && c == ncclFuncAllReduce && a == NCCL_ALGO_RING && comm->nRanks == 2); break;
|
|
default: pEnable &= 0; break;
|
|
}
|
|
#endif
|
|
}
|
|
if (pEnable == 0) comm->bandwidths[c][a][p] = 0;
|
|
// Never disable ring for non-allreduce operations. That allows to run real apps with NCCL_ALGO=TREE.
|
|
if (a == NCCL_ALGO_RING && c != ncclFuncAllReduce) continue;
|
|
if (algoEnable[a] == 0) comm->bandwidths[c][a][p] = 0;
|
|
}
|
|
|
|
if (comm->rank == 0) {
|
|
char line[1024];
|
|
sprintf(line, "Latency/AlgBw |");
|
|
for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) {
|
|
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
|
|
sprintf(line+strlen(line), " %7s/%6s |", ncclAlgoStr[a], ncclProtoStr[p]);
|
|
}
|
|
}
|
|
INFO(NCCL_TUNING, "%s", line);
|
|
sprintf(line, " Max NThreads |");
|
|
for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) {
|
|
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
|
|
sprintf(line+strlen(line), " %14d |", comm->maxThreads[a][p]);
|
|
}
|
|
}
|
|
INFO(NCCL_TUNING, "%s", line);
|
|
for (int c=0; c<NCCL_NUM_FUNCTIONS; c++) {
|
|
sprintf(line, "%13s |", ncclFuncStr[c]);
|
|
for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) {
|
|
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
|
|
sprintf(line+strlen(line), "%8.1f/%6.1f |", comm->latencies[c][a][p], comm->bandwidths[c][a][p]);
|
|
}
|
|
}
|
|
INFO(NCCL_TUNING, "%s", line);
|
|
}
|
|
}
|
|
|
|
// Set per-thread amount of work before we increase nThreads and nChannels
|
|
for (int a=0; a<NCCL_NUM_ALGORITHMS; a++) {
|
|
comm->threadThresholds[a][NCCL_PROTO_LL] = NCCL_LL_THREAD_THRESHOLD;
|
|
comm->threadThresholds[a][NCCL_PROTO_LL128] = NCCL_LL128_THREAD_THRESHOLD;
|
|
comm->threadThresholds[a][NCCL_PROTO_SIMPLE] = NCCL_SIMPLE_THREAD_THRESHOLD;
|
|
}
|
|
comm->threadThresholds[NCCL_ALGO_RING][NCCL_PROTO_LL] *= nRanks;
|
|
comm->threadThresholds[NCCL_ALGO_COLLNET_DIRECT][NCCL_PROTO_SIMPLE] = 256;
|
|
comm->threadThresholds[NCCL_ALGO_COLLNET_CHAIN][NCCL_PROTO_SIMPLE] = 256;
|
|
|
|
// Override defaults with user env
|
|
char* str = getenv("NCCL_THREAD_THRESHOLDS");
|
|
if (str) {
|
|
INFO(NCCL_ENV, "NCCL_THREAD_THRESHOLDS set by environment to %s", str);
|
|
ssize_t t[2][NCCL_NUM_PROTOCOLS] = {{ -2, -2, -2 }, { -2, -2, -2 }};
|
|
sscanf(str, "%ld %ld %ld %ld %ld %ld", t[0], t[0]+1, t[0]+2, t[1], t[1]+1, t[1]+2);
|
|
for (int a=0; a<2; a++) {
|
|
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
|
|
if (t[a][p] >= 0) comm->threadThresholds[a][p] = t[a][p];
|
|
}
|
|
}
|
|
}
|
|
|
|
INFO(NCCL_INIT, "threadThresholds %ld/%ld/%ld | %ld/%ld/%ld | %ld | %ld",
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|
comm->threadThresholds[NCCL_ALGO_TREE][NCCL_PROTO_LL],
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|
comm->threadThresholds[NCCL_ALGO_TREE][NCCL_PROTO_LL128],
|
|
comm->threadThresholds[NCCL_ALGO_TREE][NCCL_PROTO_SIMPLE],
|
|
comm->threadThresholds[NCCL_ALGO_RING][NCCL_PROTO_LL],
|
|
comm->threadThresholds[NCCL_ALGO_RING][NCCL_PROTO_LL128],
|
|
comm->threadThresholds[NCCL_ALGO_RING][NCCL_PROTO_SIMPLE],
|
|
comm->threadThresholds[NCCL_ALGO_COLLNET_DIRECT][NCCL_PROTO_SIMPLE],
|
|
comm->threadThresholds[NCCL_ALGO_COLLNET_CHAIN][NCCL_PROTO_SIMPLE]);
|
|
return ncclSuccess;
|
|
}
|
|
|
|
ncclResult_t ncclTopoGetAlgoTime(struct ncclInfo* info, int algorithm, int protocol, int numPipeOps, float* time) {
|
|
float bw = info->comm->bandwidths[info->coll][algorithm][protocol];
|
|
float lat = info->comm->latencies[info->coll][algorithm][protocol];
|
|
if (bw == 0) {
|
|
*time = -1.0; return ncclSuccess;
|
|
}
|
|
int logSize = log2i(info->nBytes>>6);
|
|
|
|
#if defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
|
|
if (algorithm == NCCL_ALGO_TREE) {
|
|
if (logSize < 27) bw *= rcclTuningModel[info->comm->topo->tuning].treeCorrectionFactor[protocol][logSize];
|
|
else bw *= rcclTuningModel[info->comm->topo->tuning].treeCorrectionFactor[protocol][26];
|
|
}
|
|
else if (algorithm == NCCL_ALGO_RING && info->comm->nNodes > 1) {
|
|
if(logSize < 27) bw *= rcclTuningModel[info->comm->topo->tuning].ringCorrectionFactor[protocol][logSize];
|
|
else bw *= rcclTuningModel[info->comm->topo->tuning].ringCorrectionFactor[protocol][26];
|
|
}
|
|
#else
|
|
if (algorithm == NCCL_ALGO_TREE && logSize < 23) bw *= treeCorrectionFactor[protocol][logSize];
|
|
if (info->nChannels != 0) bw = bw / info->comm->nChannels * info->nChannels;
|
|
if (algorithm == NCCL_ALGO_RING && protocol == NCCL_PROTO_SIMPLE && info->comm->nNodes > 1
|
|
&& info->coll == ncclFuncAllReduce && info->nBytes >= info->comm->nRanks/16.0*65536) lat *= 1.9; // Plateau effect of ring
|
|
#endif
|
|
// Tree pipelining saves latency in aggregation cases
|
|
int latCount = algorithm == NCCL_ALGO_RING ? numPipeOps : DIVUP(numPipeOps, NCCL_MAX_WORK_ELEMENTS);
|
|
*time = lat * latCount + (info->nBytes) / (1000 * bw);
|
|
return ncclSuccess;
|
|
}
|