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rocm-systems/src/init.cc
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/*************************************************************************
* Copyright (c) 2015-2021, NVIDIA CORPORATION. All rights reserved.
* Modifications Copyright (c) 2019-2021 Advanced Micro Devices, Inc. All rights reserved.
*
* See LICENSE.txt for license information
************************************************************************/
#include "nccl.h"
#include "channel.h"
#include "nvmlwrap.h"
#include "gdrwrap.h"
#include "bootstrap.h"
#include "transport.h"
#include "group.h"
#include "net.h"
#include "coll_net.h"
#include "enqueue.h"
#include "graph.h"
#include "argcheck.h"
#include <fcntl.h>
#include <unistd.h>
#include <hip/hip_runtime.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "graph/topo.h"
// [RCCL]
#include "clique/CliqueManager.h"
// [/RCCL]
#define STR2(v) #v
#define STR(v) STR2(v)
#ifdef ENABLE_TRACE
std::chrono::high_resolution_clock::time_point ncclEpoch;
#endif
#if CUDART_VERSION >= 9020 || defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
#define NCCL_GROUP_CUDA_STREAM 0 // CGMD: CUDA 9.2,10.X Don't need to use an internal CUDA stream
#else
#define NCCL_GROUP_CUDA_STREAM 1 // CGMD: CUDA 9.0,9.1 Need to use an internal CUDA stream
#endif
const char* ncclFuncStr[NCCL_NUM_FUNCTIONS+1] = { "Broadcast", "Reduce", "AllGather", "ReduceScatter", "AllReduce", "SendRecv" };
const char* ncclAlgoStr[NCCL_NUM_ALGORITHMS] = { "Tree", "Ring", "CollNet" };
const char* ncclProtoStr[NCCL_NUM_PROTOCOLS] = { "LL", "LL128", "Simple" };
const char* ncclRedOpStr[ncclNumOps] = { "Sum", "Prod", "Max", "Min" };
const char *ncclTypeStr[ncclNumTypes] = {"_i8", "_u8", "_i32", "_u32", "_i64", "_u64", "_f16", "_f32", "_f64", "_b16"};
NCCL_PARAM(GroupCudaStream, "GROUP_CUDA_STREAM", NCCL_GROUP_CUDA_STREAM);
NCCL_PARAM(CheckPointers, "CHECK_POINTERS", 0);
ncclNet_t* ncclNet = NULL;
ncclCollNet_t* ncclCollNet = NULL;
struct allocationTracker allocTracker[MAX_ALLOC_TRACK_NGPU] = {};
// Returns ncclInternalError if anything fails, causing that network to be ignored.
ncclResult_t initNet(ncclNet_t* net) {
int ndev;
if (net->init(ncclDebugLog) != ncclSuccess) return ncclInternalError;
if (net->devices(&ndev) != ncclSuccess) return ncclInternalError;
if (ndev <= 0) return ncclSystemError;
return ncclSuccess;
}
ncclResult_t initCollNet(ncclCollNet_t* collnet) {
int ndev;
if (collnet->init(ncclDebugLog) != ncclSuccess) return ncclInternalError;
if (collnet->devices(&ndev) != ncclSuccess) return ncclInternalError;
if (ndev <= 0) return ncclSystemError;
return ncclSuccess;
}
ncclResult_t initNetPlugin(ncclNet_t** net, ncclCollNet_t** collnet) {
void* netPluginLib = dlopen("librccl-net.so", RTLD_NOW | RTLD_LOCAL);
if (netPluginLib == NULL) {
// dlopen does not guarantee to set errno, but dlerror only gives us a
// string, so checking errno doesn't hurt to try to provide a better
// error message
if (errno == ENOENT) {
INFO(NCCL_INIT|NCCL_NET, "NET/Plugin : No plugin found (librccl-net.so), using internal implementation");
} else {
INFO(NCCL_INIT|NCCL_NET, "NET/Plugin : Plugin load returned %d : %s.", errno, dlerror());
}
return ncclSuccess;
}
ncclNet_t* extNet = (ncclNet_t*) dlsym(netPluginLib, STR(NCCL_PLUGIN_SYMBOL));
if (extNet == NULL) {
INFO(NCCL_INIT|NCCL_NET, "NET/Plugin: Failed to find " STR(NCCL_PLUGIN_SYMBOL) " symbol.");
} else if (initNet(extNet) == ncclSuccess) {
*net = extNet;
// Check for CollNet
ncclCollNet_t* extCollNet = (ncclCollNet_t*) dlsym(netPluginLib, STR(NCCL_COLLNET_PLUGIN_SYMBOL));
if (extCollNet == NULL) {
INFO(NCCL_INIT|NCCL_NET, "NET/Plugin: Failed to find " STR(NCCL_COLLNET_PLUGIN_SYMBOL) " symbol.");
} else if (initCollNet(extCollNet) == ncclSuccess) {
*collnet = extCollNet;
}
return ncclSuccess;
}
if (netPluginLib != NULL) dlclose(netPluginLib);
return ncclSuccess;
}
ncclResult_t initNet() {
// Always initialize bootstrap network
NCCLCHECK(bootstrapNetInit());
NCCLCHECK(initNetPlugin(&ncclNet, &ncclCollNet));
if (ncclNet != NULL) return ncclSuccess;
if (initNet(&ncclNetIb) == ncclSuccess) {
ncclNet = &ncclNetIb;
} else {
NCCLCHECK(initNet(&ncclNetSocket));
ncclNet = &ncclNetSocket;
}
return ncclSuccess;
}
// GDRCOPY support: Off by default
NCCL_PARAM(GdrCopyEnable, "GDRCOPY_ENABLE", 0);
// GDRCOPY support
gdr_t ncclGdrCopy = NULL;
ncclResult_t initGdrCopy() {
if (ncclParamGdrCopyEnable() == 1) {
ncclGdrCopy = ncclGdrInit();
}
return ncclSuccess;
}
NCCL_PARAM(CollNetEnable, "COLLNET_ENABLE", 0);
pthread_mutex_t initLock = PTHREAD_MUTEX_INITIALIZER;
static bool initialized = false;
static size_t maxLocalSizeBytes = 0;
static ncclResult_t ncclInit() {
if (initialized) return ncclSuccess;
pthread_mutex_lock(&initLock);
if (!initialized) {
initEnv();
initGdrCopy();
maxLocalSizeBytes = ncclKernMaxLocalSize();
NCCLCHECK(initNet());
INFO(NCCL_INIT, "Using network %s", ncclNetName());
initialized = true;
}
pthread_mutex_unlock(&initLock);
return ncclSuccess;
}
NCCL_API(ncclResult_t, ncclGetVersion, int* version);
ncclResult_t ncclGetVersion(int* version) {
if (version == NULL) return ncclInvalidArgument;
*version = NCCL_VERSION_CODE;
return ncclSuccess;
}
NCCL_API(ncclResult_t, ncclGetUniqueId, ncclUniqueId* out);
ncclResult_t ncclGetUniqueId(ncclUniqueId* out) {
NCCLCHECK(ncclInit());
NCCLCHECK(PtrCheck(out, "GetUniqueId", "out"));
return bootstrapGetUniqueId(out);
}
// Prevent compiler from optimizing out these operations
#ifdef __clang__
#define NCCL_NO_OPTIMIZE __attribute__((optnone))
#else
#define NCCL_NO_OPTIMIZE __attribute__((optimize("O0")))
#endif
void NCCL_NO_OPTIMIZE commPoison(ncclComm_t comm) {
comm->rank = comm->cudaDev = comm->busId = comm->nRanks = -1;
}
RCCL_PARAM(KernelCollTraceEnable, "KERNEL_COLL_TRACE_ENABLE", 0);
#ifdef ENABLE_COLLTRACE
void *ncclCommThreadMain(void *arg) {
ncclComm_t comm = (ncclComm_t)arg;
int head = comm->hostDevComm.collTraceHead;
#define MAX_NAME_LENGTH 32
char* func_names = (char *)malloc(MAX_NAME_LENGTH*(FUNC_INDEX_P2P+1));
for (int func = 0; func < NCCL_NUM_FUNCTIONS; func++) {
for (int al = 0; al < NCCL_NUM_ALGORITHMS; al++) {
for (int type = 0; type < ncclNumTypes; type++) {
for (int pr = 0; pr < NCCL_NUM_PROTOCOLS; pr++) {
for (int redop = 0; redop < ncclNumOps; redop++) {
char* line = func_names+MAX_NAME_LENGTH*FUNC_INDEX(func, redop, type, al, pr);
sprintf(line, "%s%s%s%s%s", ncclFuncStr[func], ncclAlgoStr[al], ncclProtoStr[pr],
ncclRedOpStr[redop], ncclTypeStr[type]);
}
}
}
}
}
char* line = func_names+MAX_NAME_LENGTH*FUNC_INDEX_P2P;
sprintf(line, "%s", ncclFuncStr[NCCL_NUM_FUNCTIONS]);
do {
int tail = LOAD(comm->hostDevComm.collTraceTail)%COLLTRACE_NUM_ITEMS;
int count;
if (head <= tail)
count = tail - head;
else
count = COLLTRACE_NUM_ITEMS + head - tail;
if (!count) {
if(LOAD(&comm->hostDevComm.collTraceExit))
break;
else {
usleep(1000); //sleep 1ms
continue;
}
}
for (int i = 0; i < count; i++) {
struct ncclCollTrace *td = comm->hostDevComm.collTrace+head;
uint8_t type = LOAD(&(td->type));
if (type == ncclCollTraceNotReady)
break;
char line[1024];
int offset = 0;
uint16_t fIdx = td->funcIndex;
#define VEGA_GPU_RTC_FREQUENCY 2.5E7
if (type == ncclCollTraceDataType) {
sprintf(line, "## [%12.6f] [%02d:%02d] L:%04d DT %08x %016lx %016lx",
(double)(td->timeStamp)/VEGA_GPU_RTC_FREQUENCY, comm->rank, td->bid,
fIdx, td->data_0, td->opCount, td->data_1);
} else {
sprintf(line, "## [%12.6f] [%02d:%02d] %06lx",
(double)(td->timeStamp)/VEGA_GPU_RTC_FREQUENCY, comm->rank, td->bid, td->opCount);
offset = strlen(line);
switch (type) {
case ncclCollTraceKernelLaunchType:
sprintf(line+offset, " KL HWID %8x %s ",
td->data_0, func_names+MAX_NAME_LENGTH*fIdx);
offset = strlen(line);
if (fIdx > FUNC_INDEX_P2P)
sprintf(line+offset, "ERROR bad function index %d", fIdx);
else if (fIdx == FUNC_INDEX_P2P)
sprintf(line+offset, "nt %d dt %d", td->p2p.nThreads, td->p2p.delta);
else
sprintf(line+offset, "nt %d bi %d nc %d", td->coll.nThreads, td->coll.bid, td->coll.nChannels);
break;
case ncclCollTraceCollEndType:
if (fIdx != 0xffff) {
sprintf(line+offset, " CE %s ", func_names+MAX_NAME_LENGTH*fIdx);
offset = strlen(line);
if (fIdx > FUNC_INDEX_P2P)
sprintf(line+offset, "ERROR bad function index %d", fIdx);
else if (fIdx == FUNC_INDEX_P2P)
sprintf(line+offset, "nt %d dt %d", td->p2p.nThreads, td->p2p.delta);
else
sprintf(line+offset, "nt %d bi %d nc %d", td->coll.nThreads, td->coll.bid, td->coll.nChannels);
}
else
sprintf(line+offset, " KE");
break;
case ncclCollTraceAbortType:
sprintf(line+offset, " Abort");
break;
default:
sprintf(line+offset, " unknown collective trace data type");
break;
}
}
INFO(NCCL_COLL, "%s", line);
STORE(&(td->type), ncclCollTraceNotReady);
head ++;
head %= COLLTRACE_NUM_ITEMS;
}
} while(1);
free(func_names);
comm->hostDevComm.collTraceHead = head;
pthread_exit(NULL);
}
#endif
#undef NCCL_NO_OPTIMIZE
static ncclResult_t commFree(ncclComm_t comm) {
if (comm == NULL)
return ncclSuccess;
free(comm->connectSend);
free(comm->connectRecv);
free(comm->p2pSends);
free(comm->p2pRecvs);
free(comm->asyncOps);
#ifdef ENABLE_PROFILING
struct ncclProf* prof = (struct ncclProf*)malloc(sizeof(struct ncclProf));
CUDACHECK(hipMemcpy(prof, comm->hostDevComm.devProf, sizeof(struct ncclProf), hipMemcpyDeviceToHost));
uint64_t wait_cycle = 0, wait_recv_cycle = 0;
for (int chan=0; chan<comm->nChannels; chan++) {
wait_cycle += prof->wait_cycle[chan];
wait_recv_cycle += prof->wait_recv_cycle[chan];
}
#define VEGA_GPU_RTC_FREQUENCY 2.5E7
if (comm->rank == 0) {
INFO(NCCL_INIT, "# %4s %6s %6s %6s %6s %6s %7s %6s %6s %6s %6s %6s", "Rank", "total", " wait", "w_recv", "send", "rcRdS", "dRcRdCS", "dRcCS", "dRc", "cS", "rc", "rcCS");
INFO(NCCL_INIT, "# %4s %6s %6s %6s %6s %6s %7s %6s %6s %6s %6s %6s", "", "(s)", "(s)", "(s)", "(GB/s)", "(GB/s)", "(GB/s)", "(GB/s)", "(GB/s)", "(GB/s)", "(GB/s)", "(GB/s)");
}
INFO(NCCL_INIT, "# %4d %6.4f %6.4f %6.4f %6.2f %6.2f %7.2f %6.2f %6.2f %6.2f %6.2f %6.2f",
comm->rank, (double)prof->total_cycle/VEGA_GPU_RTC_FREQUENCY/comm->nChannels,
(double)wait_cycle/VEGA_GPU_RTC_FREQUENCY/comm->nChannels,
(double)wait_recv_cycle/VEGA_GPU_RTC_FREQUENCY/comm->nChannels,
(prof->send_cycle) ? (double)prof->send_byte*comm->nChannels/((double)prof->send_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0,
(prof->recvReduceSend_cycle) ? (double)prof->recvReduceSend_byte*comm->nChannels/((double)prof->recvReduceSend_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0,
(prof->directRecvReduceCopySend_cycle) ? (double)prof->directRecvReduceCopySend_byte*comm->nChannels/((double)prof->directRecvReduceCopySend_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0,
(prof->directRecvCopySend_cycle) ? (double)prof->directRecvCopySend_byte*comm->nChannels/((double)prof->directRecvCopySend_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0,
(prof->directRecv_cycle) ? (double)prof->directRecv_byte*comm->nChannels/((double)prof->directRecv_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0,
(prof->copySend_cycle) ? (double)prof->copySend_byte*comm->nChannels/((double)prof->copySend_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0,
(prof->recv_cycle) ? (double)prof->recv_byte*comm->nChannels/((double)prof->recv_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0,
(prof->recvCopySend_cycle) ? (double)prof->recvCopySend_byte*comm->nChannels/((double)prof->recvCopySend_cycle/VEGA_GPU_RTC_FREQUENCY*1.0E9) : 0);
free(prof);
CUDACHECK(hipFree(comm->hostDevComm.devProf));
for (int channel=0; channel<std::max(comm->nChannels, comm->p2pnChannels); channel++) {
if (comm->channels[channel].send_byte) INFO(NCCL_INIT, "# [%03d:%02d] Proxy Send %6.2f GB/s (%ld bytes %d measurements)",
comm->rank, channel, (comm->channels[channel].bw_count) ?
(float)comm->channels[channel].bw_cumulative/comm->channels[channel].bw_count : 0,
comm->channels[channel].send_byte, comm->channels[channel].bw_count);
if (comm->channels[channel].recv_byte) INFO(NCCL_INIT, "# [%03d:%02d] Proxy Recv %6.2f GB/s (%ld bytes %d measurements)",
comm->rank, channel, (comm->channels[channel].bw_count) ?
(float)comm->channels[channel].bw_cumulative/comm->channels[channel].bw_count : 0,
comm->channels[channel].recv_byte, comm->channels[channel].bw_count);
}
#endif
#ifdef ENABLE_COLLTRACE
STORE(&comm->hostDevComm.collTraceExit, 1);
if (comm->hostDevComm.collTraceThread) pthread_join(comm->hostDevComm.collTraceThread, NULL);
NCCLCHECK(ncclCudaHostFree((void *)comm->hostDevComm.collTrace));
NCCLCHECK(ncclCudaHostFree((void *)comm->hostDevComm.collTraceTail));
#endif
free(comm->peerInfo);
ncclTopoFree(comm->topo);
if (comm->bootstrap)
NCCLCHECK(bootstrapClose(comm->bootstrap));
CUDACHECK(hipFree(comm->hostDevComm.channels));
CUDACHECK(hipFree(comm->devComm));
for (int channel=0; channel<MAXCHANNELS; channel++)
NCCLCHECK(freeChannel(comm->channels+channel, comm->nRanks));
if (comm->doneEvent != NULL)
CUDACHECK(hipEventDestroy(comm->doneEvent));
if (comm->intDoneEvent != NULL)
CUDACHECK(hipEventDestroy(comm->intDoneEvent));
if (comm->launchMode == ncclComm::GROUP) {
CUDACHECK(hipStreamDestroy(comm->groupStream));
}
ncclDestroyQueueInfo(comm->enqueueInfo);
// Last rank frees shared resources between threads
int isLast;
NCCLCHECK(ncclCpuBarrierIn(comm, &isLast));
if (isLast) {
free(comm->intraBarrier);
free(comm->intraParams);
free(comm->intraCudaDevs);
free(comm->intraCGMode);
free(comm->intraCC);
}
NCCLCHECK(ncclCudaHostFree((void *)comm->abortFlag));
NCCLCHECK(ncclCudaHostFree((void *)comm->p2pNet));
// Poison comm to try and catch a double free
commPoison(comm);
free(comm);
return ncclSuccess;
}
RCCL_PARAM(ForceEnableClique, "FORCE_ENABLE_CLIQUE", 0);
RCCL_PARAM(P2pNetDisable, "P2P_NET_DISABLE", 0);
static ncclResult_t commAlloc(ncclComm_t* comret, int ndev, int rank) {
if (ndev < 1) {
WARN("invalid device count (%d) requested", ndev);
return ncclInvalidArgument;
}
if (rank >= ndev || rank < 0) {
WARN("rank %d exceeds ndev=%d", rank, ndev);
return ncclInvalidArgument;
}
// Try to create a CUDA object right away. If there is something wrong with
// the device we're on (failure cause #1) , better know it early.
hipEvent_t doneEvent;
CUDACHECK(hipEventCreateWithFlags(&doneEvent, hipEventDisableTiming));
hipEvent_t intDoneEvent;
CUDACHECK(hipEventCreateWithFlags(&intDoneEvent, hipEventDisableTiming));
struct ncclComm* comm;
NCCLCHECK(ncclCalloc(&comm, 1));
comm->rank = comm->hostDevComm.rank = rank;
comm->nRanks = comm->hostDevComm.nRanks = ndev;
hipGetDevice(&comm->cudaDev);
NCCLCHECK(getBusId(comm->cudaDev, &comm->busId));
TRACE(NCCL_INIT,"comm %p rank %d nranks %d cudaDev %d busId %lx", comm, rank, ndev, comm->cudaDev, comm->busId);
comm->doneEvent = doneEvent;
comm->intDoneEvent = intDoneEvent;
comm->checkPointers = ncclParamCheckPointers() == 1 ? true : false;
#if CUDART_VERSION >= 9020 || defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
comm->groupCudaStream = ncclParamGroupCudaStream();
#else
// Don't allow the user to overload the default setting in older CUDA builds
comm->groupCudaStream = NCCL_GROUP_CUDA_STREAM;
#endif
comm->fatalError = ncclSuccess;
NCCLCHECK(ncclCudaHostCalloc((uint32_t**)&comm->abortFlag, 1));
comm->hostDevComm.abortFlag = comm->abortFlag;
STORE(comm->abortFlag, 0);
NCCLCHECK(ncclCudaHostCalloc((uint32_t**)&comm->p2pNet, 1));
comm->hostDevComm.p2pNet = comm->p2pNet;
STORE(comm->p2pNet, 0);
comm->argsptr = &comm->args;
#ifdef ENABLE_PROFILING
NCCLCHECK(ncclCudaCalloc(&comm->hostDevComm.devProf, 1));
#endif
#ifdef ENABLE_COLLTRACE
NCCLCHECK(ncclCudaHostCalloc(&comm->hostDevComm.collTraceTail, 1));
NCCLCHECK(ncclCudaHostCalloc(&comm->hostDevComm.collTrace, COLLTRACE_NUM_ITEMS));
memset(comm->hostDevComm.collTrace, 0, sizeof(struct ncclCollTrace) * COLLTRACE_NUM_ITEMS);
comm->hostDevComm.collTraceExit = comm->hostDevComm.collTraceHead = *comm->hostDevComm.collTraceTail = 0;
if ((ncclDebugLevel >= NCCL_LOG_INFO) && rcclParamKernelCollTraceEnable())
pthread_create(&comm->hostDevComm.collTraceThread, NULL, ncclCommThreadMain, (void *)comm);
else
comm->hostDevComm.collTraceThread = 0;
#endif
comm->collNetSupport = 0;
NCCLCHECK(ncclCalloc(&comm->asyncOps, NCCL_MAX_OPS));
comm->asyncOpCount = 0;
comm->asyncTotalSize = 0;
NCCLCHECK(ncclCalloc(&comm->enqueueInfo, 1));
comm->enqueueInfo->comm = comm;
comm->lastSetupNode = NULL;
comm->lastCudaGraphId = -1;
static_assert(MAXCHANNELS <= sizeof(*comm->connectSend)*8, "comm->connectSend must have enough bits for all channels");
static_assert(MAXCHANNELS <= sizeof(*comm->connectRecv)*8, "comm->connectRecv must have enough bits for all channels");
NCCLCHECK(ncclCalloc(&comm->connectSend, comm->nRanks));
NCCLCHECK(ncclCalloc(&comm->connectRecv, comm->nRanks));
comm->p2pSendCount = comm->p2pRecvCount = 0;
NCCLCHECK(ncclCalloc(&comm->p2pSends, comm->nRanks));
NCCLCHECK(ncclCalloc(&comm->p2pRecvs, comm->nRanks));
// Mark channels as non initialized.
for (int c=0; c<MAXCHANNELS; c++) comm->channels[c].id = -1;
*comret = comm;
return ncclSuccess;
}
static ncclResult_t devCommSetup(ncclComm_t comm) {
// Duplicate the channels on the device
NCCLCHECK(ncclCudaCalloc(&comm->hostDevComm.channels, std::max(comm->nChannels, comm->p2pnChannels)));
NCCLCHECK(ncclCudaMemcpy(comm->hostDevComm.channels, comm->channels, std::max(comm->nChannels, comm->p2pnChannels)));
// Copy userRanks and peers
for (int r=0; r<std::max(comm->nChannels, comm->p2pnChannels); r++) {
NCCLCHECK(ncclCudaMemcpy(comm->channels[r].ring.devUserRanks, comm->channels[r].ring.userRanks, comm->nRanks));
}
// Duplicate the dev comm on the device
NCCLCHECK(ncclCudaCalloc(&comm->devComm, 1));
NCCLCHECK(ncclCudaMemcpy(comm->devComm, &comm->hostDevComm, 1));
return ncclSuccess;
}
// Pre-process the string so that running "strings" on the lib can quickly reveal the version.
#if defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
#define VERSION_STRING "RCCL version " STR(NCCL_MAJOR) "." STR(NCCL_MINOR) "." STR(NCCL_PATCH) NCCL_SUFFIX "+hip" STR(HIP_VERSION_MAJOR) "." STR(HIP_VERSION_MINOR)
#else
#define VERSION_STRING "NCCL version " STR(NCCL_MAJOR) "." STR(NCCL_MINOR) "." STR(NCCL_PATCH) NCCL_SUFFIX "+cuda" STR(CUDA_MAJOR) "." STR(CUDA_MINOR)
#endif
static void showVersion() {
static int shown = 0;
if (shown == 0 && ncclDebugLevel >= NCCL_LOG_VERSION) {
printf("%s\n", VERSION_STRING);
fflush(stdout);
if (ncclDebugFile != stdout)
INFO(NCCL_ALL,"%s", VERSION_STRING); // Also log NCCL version in one of the files
shown = 1;
}
}
static ncclResult_t fillInfo(struct ncclComm* comm, struct ncclPeerInfo* info, uint64_t commHash) {
info->rank = comm->rank;
CUDACHECK(hipGetDevice(&info->cudaDev));
info->hostHash=getHostHash()+commHash;
info->pidHash=getPidHash()+commHash;
// Get the device MAJOR:MINOR of /dev/shm so we can use that
// information to decide whether we can use SHM for inter-process
// communication in a container environment
struct stat statbuf;
SYSCHECK(stat("/dev/shm", &statbuf), "stat");
info->shmDev = statbuf.st_dev;
info->busId = comm->busId;
NCCLCHECK(ncclGpuGdrSupport(&info->gdrSupport));
return ncclSuccess;
}
static ncclResult_t setupChannel(struct ncclComm* comm, int channelId, int rank, int nranks, int* ringRanks) {
TRACE(NCCL_INIT, "rank %d nranks %d", rank, nranks);
NCCLCHECK(initChannel(comm, channelId));
struct ncclRing* ring = &comm->channels[channelId].ring;
// Reorganize ranks to start with rank.
int shift;
for (shift = 0; shift<nranks; shift++) {
if (ringRanks[shift] == rank) {
break;
}
}
for (int i=0; i<nranks; i++) {
ring->userRanks[i] = ringRanks[(i+shift)%nranks];
}
return ncclSuccess;
}
void* waitForNonNullPtr(void* p) {
volatile void** ptr = (volatile void**) p;
while (LOAD(ptr) == NULL) sched_yield();
return (void*)(LOAD(ptr));
}
ncclResult_t initParams(struct ncclComm* comm) {
hipLaunchParams* params = comm->myParams = comm->intraParams+comm->intraRank;
params->args = (void **)&comm->argsptr;
params->stream = NULL;
params->sharedMem = 0;
params->blockDim.x = 0; params->blockDim.y = params->blockDim.z = 1;
params->gridDim.x = 0; params->gridDim.y = params->gridDim.z = 1;
return ncclSuccess;
}
// Allocate/Set Intra Process Structures and set CG options
ncclResult_t ncclCommSetIntra(struct ncclComm* comm, int rank, int ranks, struct ncclComm* comm0) {
comm->intraRank = rank;
comm->intraRanks = ranks;
comm->intraPhase = 0;
// Alloc shared structures
if (rank == 0) {
assert(comm == comm0);
int* bar;
NCCLCHECK(ncclCalloc(&bar, 2));
bar[0] = bar[1] = 0;
comm->intraBarrier = bar;
NCCLCHECK(ncclCalloc(&comm->intraParams, comm->intraRanks));
NCCLCHECK(ncclCalloc(&comm->intraCudaDevs, comm->intraRanks));
int* CGMode;
NCCLCHECK(ncclCalloc(&CGMode, 1));
*CGMode = 0x11;
comm->intraCGMode = CGMode;
int* CC;
NCCLCHECK(ncclCalloc(&CC, 1));
*CC = ncclCudaCompCap();
comm->intraCC = CC;
} else {
comm->intraBarrier = (int*)waitForNonNullPtr(&comm0->intraBarrier);
comm->intraParams = (hipLaunchParams*)waitForNonNullPtr(&comm0->intraParams);
comm->intraCudaDevs = (int*)waitForNonNullPtr(&comm0->intraCudaDevs);
comm->intraCGMode = (int*)waitForNonNullPtr(&comm0->intraCGMode);
comm->intraCC = (int*)waitForNonNullPtr(&comm0->intraCC);
}
comm->intraCudaDevs[comm->intraRank] = comm->cudaDev;
NCCLCHECK(initParams(comm));
int cgMdLaunch = 1;
// Set CG Mode
comm->launchMode = ncclComm::PARALLEL;
char* str = getenv("NCCL_LAUNCH_MODE");
if (str) INFO(NCCL_ENV, "NCCL_LAUNCH_MODE set by environment to %s", str);
if (str && strcmp(str, "GROUP") == 0) {
comm->launchMode = ncclComm::GROUP;
}
if (comm->launchMode == ncclComm::GROUP) {
CUDACHECK(hipStreamCreateWithFlags(&comm->groupStream, hipStreamNonBlocking));
if (*comm->intraCC && (ncclCudaCompCap() == *comm->intraCC)) {
// Check whether the GPU supports Cooperative Group Multi Device Launch
hipError_t ret = hipDeviceGetAttribute(&cgMdLaunch, hipDeviceAttributeCooperativeMultiDeviceLaunch, comm->cudaDev);
if (ret != hipSuccess) {
INFO(NCCL_INIT, "hipDeviceGetAttribute(hipDeviceAttributeCooperativeMultiDeviceLaunch, %d) failed with %s",
comm->cudaDev, hipGetErrorString(ret));
return ncclInternalError;
}
if (!cgMdLaunch) {
INFO(NCCL_INIT, "Multi-GPU cooperative launch support not available for device %d", comm->cudaDev);
}
}
}
// Disable cgMdLaunch if any rank does not support it
if (cgMdLaunch == 0) {
*comm->intraCGMode = 0x10;
}
return ncclSuccess;
}
#define DEFAULT_LL_BUFFSIZE (NCCL_LL_LINES_PER_THREAD*NCCL_LL_MAX_NTHREADS*NCCL_STEPS*sizeof(union ncclLLFifoLine))
#define DEFAULT_LL128_BUFFSIZE (NCCL_LL128_ELEMS_PER_THREAD*NCCL_LL128_MAX_NTHREADS*NCCL_STEPS*sizeof(uint64_t))
#define DEFAULT_BUFFSIZE (1 << 22) /* 4MiB */
#define DEFAULT_BUFFSIZE_ARM (1 << 20) /* 1MiB */
NCCL_PARAM(BuffSize, "BUFFSIZE", -2);
NCCL_PARAM(LlBuffSize, "LL_BUFFSIZE", -2);
NCCL_PARAM(Ll128BuffSize, "LL128_BUFFSIZE", -2);
static ncclResult_t computeBuffSizes(struct ncclComm* comm) {
int cpuArch, cpuVendor, cpuModel;
NCCLCHECK(ncclTopoCpuType(comm->topo, &cpuArch, &cpuVendor, &cpuModel));
int64_t envs[NCCL_NUM_PROTOCOLS] = { ncclParamLlBuffSize(), ncclParamLl128BuffSize(), ncclParamBuffSize() };
int defaults[NCCL_NUM_PROTOCOLS] = { DEFAULT_LL_BUFFSIZE, DEFAULT_LL128_BUFFSIZE, DEFAULT_BUFFSIZE };
if (cpuArch == NCCL_TOPO_CPU_ARCH_ARM) defaults[NCCL_PROTO_SIMPLE] = DEFAULT_BUFFSIZE_ARM;
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
comm->buffSizes[p] = comm->hostDevComm.buffSizes[p] = envs[p] != -2 ? envs[p] : defaults[p];
}
return ncclSuccess;
}
NCCL_PARAM(CrossNic, "CROSS_NIC", 2);
NCCL_PARAM(GraphDumpFileRank, "GRAPH_DUMP_FILE_RANK", 0);
static ncclResult_t initTransportsRank(struct ncclComm* comm, ncclUniqueId* commId) {
// We use 2 AllGathers
// 1. { peerInfo, comm, compCap}
// 2. { nChannels, graphInfo, topoRanks }
int rank = comm->rank;
int nranks = comm->nRanks;
uint64_t commHash = getHash(commId->internal, NCCL_UNIQUE_ID_BYTES);
TRACE(NCCL_INIT, "comm %p, commHash %lx, rank %d nranks %d - BEGIN", comm, commHash, rank, nranks);
// [RCCL] Collect the PID of the root
int rootPid;
NCCLCHECK(bootstrapInit(commId, rank, nranks, &comm->bootstrap, &rootPid));
// [/RCCL]
// AllGather1 - begin
struct {
struct ncclPeerInfo peerInfo;
struct ncclComm* comm;
int cudaCompCap;
} *allGather1Data;
NCCLCHECK(ncclCalloc(&allGather1Data, nranks));
allGather1Data[rank].comm = comm;
allGather1Data[rank].cudaCompCap = ncclCudaCompCap();
struct ncclPeerInfo* myInfo = &allGather1Data[rank].peerInfo;
NCCLCHECK(fillInfo(comm, myInfo, commHash));
NCCLCHECK(bootstrapAllGather(comm->bootstrap, allGather1Data, sizeof(*allGather1Data)));
NCCLCHECK(ncclCalloc(&comm->peerInfo, nranks+1)); // Extra rank to represent CollNet root
for (int i = 0; i < nranks; i++) {
memcpy(comm->peerInfo+i, &allGather1Data[i].peerInfo, sizeof(struct ncclPeerInfo));
if ((i != rank) && (comm->peerInfo[i].hostHash == myInfo->hostHash) && (comm->peerInfo[i].busId == myInfo->busId)) {
WARN("Duplicate GPU detected : rank %d and rank %d both on CUDA device %lx", rank, i, myInfo->busId);
return ncclInvalidUsage;
}
}
// Compute intra ranks and minimum CUDA Compute capabilities of intra-node GPUs and all GPUs
int intraRank0 = -1, intraRank = -1, intraRanks = 0;
int myCompCap = allGather1Data[rank].cudaCompCap;
int minCompCap = myCompCap, maxCompCap = myCompCap;
uint64_t otherHostHash;
int tmpNnodes = 1;
for (int i = 0; i < nranks; i++) {
if (allGather1Data[i].peerInfo.hostHash == allGather1Data[rank].peerInfo.hostHash) {
if (allGather1Data[i].peerInfo.pidHash == allGather1Data[rank].peerInfo.pidHash) {
if (intraRanks == 0) intraRank0 = i;
if (i == rank) intraRank = intraRanks;
intraRanks++;
}
} else { // Determine whether number of nodes is 2 (for use in tree pattern determination)
if (tmpNnodes == 1) {
otherHostHash = allGather1Data[i].peerInfo.hostHash;
tmpNnodes = 2;
} else if (tmpNnodes == 2 && otherHostHash != allGather1Data[i].peerInfo.hostHash) {
tmpNnodes = 3;
}
}
minCompCap = std::min(allGather1Data[i].cudaCompCap, minCompCap);
maxCompCap = std::max(allGather1Data[i].cudaCompCap, maxCompCap);
}
TRACE(NCCL_INIT,"hostHash[%d] %lx intraRank %d intraRanks %d intraRank0 %d",
rank, allGather1Data[rank].peerInfo.hostHash, intraRank, intraRanks, intraRank0);
if (intraRank == -1 || intraRank0 == -1 || allGather1Data[intraRank0].comm == NULL) {
WARN("Failed to determine intra ranks hostHash[%d] %lx intraRank %d intraRanks %d intraRank0 %d",
rank, allGather1Data[rank].peerInfo.hostHash, intraRank, intraRanks, intraRank0);
return ncclInternalError;
}
struct ncclComm* intraRank0Comm = allGather1Data[intraRank0].comm;
// AllGather1 - end
// Topo detection / System graph creation
NCCLCHECK(ncclTopoGetSystem(comm, &comm->topo));
// save nRanks to ncclTopoSystem as indicator of multi-node
comm->topo->nRanks = comm->nRanks;
// Compute paths between GPUs and NICs
NCCLCHECK(ncclTopoComputePaths(comm->topo, comm->peerInfo));
// Remove inaccessible GPUs and unused NICs
NCCLCHECK(ncclTopoTrimSystem(comm->topo, comm));
// Recompute paths after trimming
NCCLCHECK(ncclTopoComputePaths(comm->topo, comm->peerInfo));
// Init search
NCCLCHECK(ncclTopoSearchInit(comm->topo));
// Print final topology
NCCLCHECK(ncclTopoPrint(comm->topo));
// Get rings and trees
struct ncclTopoGraph ringGraph;
ringGraph.id = 0;
ringGraph.pattern = NCCL_TOPO_PATTERN_RING;
ringGraph.crossNic = ncclParamCrossNic();
ringGraph.collNet = 0;
ringGraph.minChannels = 1;
ringGraph.maxChannels = MAXCHANNELS/2;
NCCLCHECK(ncclTopoCompute(comm->topo, &ringGraph));
NCCLCHECK(ncclTopoPrintGraph(comm->topo, &ringGraph));
struct ncclTopoGraph treeGraph;
treeGraph.id = 1;
treeGraph.pattern = tmpNnodes <= 2 ? NCCL_TOPO_PATTERN_TREE : NCCL_TOPO_PATTERN_BALANCED_TREE;
treeGraph.crossNic = ncclParamCrossNic();
treeGraph.collNet = 0;
treeGraph.minChannels = comm->topo->nodes[NET].count != 0 ? 1 : ringGraph.nChannels;
treeGraph.maxChannels = ringGraph.nChannels;
NCCLCHECK(ncclTopoCompute(comm->topo, &treeGraph));
NCCLCHECK(ncclTopoPrintGraph(comm->topo, &treeGraph));
struct ncclTopoGraph collNetGraph;
collNetGraph.id = 2;
collNetGraph.pattern = NCCL_TOPO_PATTERN_TREE;
collNetGraph.collNet = 1;
collNetGraph.crossNic = ncclParamCrossNic();
collNetGraph.minChannels = 1;
collNetGraph.maxChannels = ringGraph.nChannels;
NCCLCHECK(ncclTopoCompute(comm->topo, &collNetGraph));
NCCLCHECK(ncclTopoPrintGraph(comm->topo, &collNetGraph));
{ // [RCCL] Check if clique-based kernels can be enabled and initialize CliqueManager
CliqueManager::cliqueMode_t cliqueMode = CliqueManager::CLIQUE_DISABLED;
if (comm->localRanks == comm->nRanks)
{
// Check that all the GPUs have peer access to one another
bool hasPeerAccess = true;
for (int i = 0; i < nranks && hasPeerAccess; i++)
{
int cudaDev1 = allGather1Data[i].peerInfo.cudaDev;
for (int j = 0; j < nranks; j++)
{
if (i == j) continue;
int cudaDev2 = allGather1Data[j].peerInfo.cudaDev;
int p2p;
if (hipDeviceCanAccessPeer(&p2p, cudaDev1, cudaDev2) != hipSuccess || !p2p)
{
hasPeerAccess = false;
break;
}
}
}
if (hasPeerAccess)
{
if (intraRanks == nranks)
cliqueMode = CliqueManager::CLIQUE_SINGLE_PROCESS;
else
cliqueMode = CliqueManager::CLIQUE_SINGLE_NODE;
}
// For now, only enable clique-based kernels on CR8_G topologies, unless explicitly asked
if (!rcclParamForceEnableClique())
{
// Disable clique-kernel support if not on CR8 topology
if (!(comm->topo->nodes[GPU].count == comm->topo->nRanks && (comm->topo->type & RCCL_TOPO_CR8G)))
{
INFO(NCCL_INIT, "Disabling clique-based kernels due to topology (force enable with RCCL_FORCE_ENABLE_CLIQUE)");
cliqueMode = CliqueManager::CLIQUE_DISABLED;
}
}
}
comm->cliqueManager = new CliqueManager(rank, nranks, cliqueMode);
NCCLCHECK(comm->cliqueManager->Init(commId, rootPid));
} // [/RCCL]
if (comm->rank == ncclParamGraphDumpFileRank()) {
struct ncclTopoGraph* graphs[3] = { &ringGraph, &treeGraph, &collNetGraph };
NCCLCHECK(ncclTopoDumpGraphs(comm->topo, 3, graphs));
}
// Determine CollNet support
if (tmpNnodes > 1 && ncclParamCollNetEnable() == 1 && collNetSupport() == 1 && collNetGraph.nChannels > 0) comm->collNetSupport = 1;
if (intraRanks > 8) {
if (comm->collNetSupport == 1) WARN("CollNet currently only supports up to 8 GPUs per node");
comm->collNetSupport = 0;
}
if ((comm->topo->type & RCCL_TOPO_4P2H_ROME) && (comm->topo->type & RCCL_TOPO_GDR_ALL)) {
if (rcclParamP2pNetDisable() == 0) {
STORE(comm->p2pNet, 1);
INFO(NCCL_INIT, "RCCL enabled same node P2P over network");
}
else
INFO(NCCL_INIT, "RCCL force disabled same node P2P over network");
}
// AllGather3 - begin
struct ncclGraphInfo {
int pattern;
int nChannels;
int sameChannels;
float speedIntra;
float speedInter;
int typeIntra;
int typeInter;
};
struct {
int collNetSupport;
int nc;
struct ncclGraphInfo tree;
struct ncclGraphInfo ring;
struct ncclGraphInfo collNet;
struct ncclTopoRanks topoRanks;
} *allGather3Data;
NCCLCHECK(ncclCalloc(&allGather3Data, nranks));
int idx;
NCCLCHECK(ncclTopoIdToIndex(comm->topo, GPU, myInfo->busId, &idx));
allGather3Data[rank].nc = 2;
if (comm->topo->nodes[GPU].count == comm->topo->nRanks && (comm->topo->type & RCCL_TOPO_CR8G))
allGather3Data[rank].nc = 4;
if (comm->topo->nodes[GPU].count == comm->topo->nRanks && comm->topo->nodes[GPU].nodes[idx].gpu.gcn == 910)
allGather3Data[rank].nc = 6;
allGather3Data[rank].tree.pattern = treeGraph.pattern;
allGather3Data[rank].tree.nChannels = treeGraph.nChannels;
allGather3Data[rank].tree.sameChannels = treeGraph.sameChannels;
allGather3Data[rank].tree.speedIntra = treeGraph.speedIntra;
allGather3Data[rank].tree.speedInter = treeGraph.speedInter;
allGather3Data[rank].tree.typeIntra = treeGraph.typeIntra;
allGather3Data[rank].tree.typeInter = treeGraph.typeInter;
allGather3Data[rank].ring.pattern = ringGraph.pattern;
allGather3Data[rank].ring.nChannels = ringGraph.nChannels;
allGather3Data[rank].ring.sameChannels = ringGraph.sameChannels;
allGather3Data[rank].ring.speedIntra = ringGraph.speedIntra;
allGather3Data[rank].ring.speedInter = ringGraph.speedInter;
allGather3Data[rank].ring.typeIntra = ringGraph.typeIntra;
allGather3Data[rank].ring.typeInter = ringGraph.typeInter;
allGather3Data[rank].collNet.pattern = collNetGraph.pattern;
allGather3Data[rank].collNet.nChannels = collNetGraph.nChannels;
allGather3Data[rank].collNet.sameChannels = collNetGraph.sameChannels;
allGather3Data[rank].collNet.speedIntra = collNetGraph.speedIntra;
allGather3Data[rank].collNet.speedInter = collNetGraph.speedInter;
allGather3Data[rank].collNet.typeIntra = collNetGraph.typeIntra;
allGather3Data[rank].collNet.typeInter = collNetGraph.typeInter;
allGather3Data[rank].collNetSupport = comm->collNetSupport;
comm->nChannels = (comm->topo->nodes[GPU].count != comm->topo->nRanks && comm->topo->nodes[NET].count)
? std::min(treeGraph.nChannels, ringGraph.nChannels) : ringGraph.nChannels;
NCCLCHECK(ncclTopoPreset(comm, &treeGraph, &ringGraph, &allGather3Data[rank].topoRanks));
NCCLCHECK(bootstrapAllGather(comm->bootstrap, allGather3Data, sizeof(*allGather3Data)));
// Determine nNodes, firstRanks, ...
int *nodesFirstRank, *nodesTreePatterns;
NCCLCHECK(ncclCalloc(&nodesFirstRank, nranks));
NCCLCHECK(ncclCalloc(&nodesTreePatterns, nranks));
for (int i=0; i<nranks; i++) {
int node = -1;
int firstRank = allGather3Data[i].topoRanks.ringRecv[0];
for (int n=0; n<comm->nNodes; n++) {
if (nodesFirstRank[n] == firstRank) node = n;
}
if (node == -1) {
node = comm->nNodes++;
nodesFirstRank[node] = firstRank;
// Record tree pattern of each node as they can be different depending on sm arch
nodesTreePatterns[node] = allGather3Data[i].tree.pattern;
}
if (i == comm->rank) comm->node = node;
}
int nChannelsOrig = comm->nChannels;
struct ncclTopoRanks** allTopoRanks;
NCCLCHECK(ncclCalloc(&allTopoRanks, comm->nRanks));
int nc = allGather3Data[0].nc;
for (int i=0; i<nranks; i++) {
allTopoRanks[i] = &allGather3Data[i].topoRanks;
nc = std::min(allGather3Data[i].nc, nc);
// Make sure we align all ranks so that the tuning is consistent across ranks
treeGraph.nChannels = std::min(allGather3Data[i].tree.nChannels, treeGraph.nChannels);
treeGraph.sameChannels = std::min(allGather3Data[i].tree.sameChannels, treeGraph.sameChannels);
treeGraph.speedIntra = std::min(allGather3Data[i].tree.speedIntra, treeGraph.speedIntra);
treeGraph.speedInter = std::min(allGather3Data[i].tree.speedInter, treeGraph.speedInter);
treeGraph.typeIntra = std::min(allGather3Data[i].tree.typeIntra, treeGraph.typeIntra);
treeGraph.typeInter = std::min(allGather3Data[i].tree.typeInter, treeGraph.typeInter);
ringGraph.nChannels = std::min(allGather3Data[i].ring.nChannels, ringGraph.nChannels);
ringGraph.sameChannels = std::min(allGather3Data[i].ring.sameChannels, ringGraph.sameChannels);
ringGraph.speedIntra = std::min(allGather3Data[i].ring.speedIntra, ringGraph.speedIntra);
ringGraph.speedInter = std::min(allGather3Data[i].ring.speedInter, ringGraph.speedInter);
ringGraph.typeIntra = std::min(allGather3Data[i].ring.typeIntra, ringGraph.typeIntra);
ringGraph.typeInter = std::min(allGather3Data[i].ring.typeInter, ringGraph.typeInter);
collNetGraph.nChannels = std::min(allGather3Data[i].collNet.nChannels, collNetGraph.nChannels);
collNetGraph.sameChannels = std::min(allGather3Data[i].collNet.sameChannels, collNetGraph.sameChannels);
collNetGraph.speedIntra = std::min(allGather3Data[i].collNet.speedIntra, collNetGraph.speedIntra);
collNetGraph.speedInter = std::min(allGather3Data[i].collNet.speedInter, collNetGraph.speedInter);
collNetGraph.typeIntra = std::min(allGather3Data[i].collNet.typeIntra, collNetGraph.typeIntra);
collNetGraph.typeInter = std::min(allGather3Data[i].collNet.typeInter, collNetGraph.typeInter);
comm->collNetSupport = std::min(allGather3Data[i].collNetSupport, comm->collNetSupport);
}
comm->nChannels = treeGraph.nChannels = ringGraph.nChannels =
(comm->topo->nodes[GPU].count != comm->topo->nRanks && comm->topo->nodes[NET].count)
? std::min(treeGraph.nChannels, ringGraph.nChannels) : ringGraph.nChannels;
if (comm->nChannels < nChannelsOrig) {
// We started duplicating channels during Preset(), so we need to move the
// duplicated channels since we have removed some.
for (int i=0; i<comm->nChannels; i++) memcpy(comm->channels+comm->nChannels+i, comm->channels+nChannelsOrig+i, sizeof(struct ncclChannel));
}
int *rings;
NCCLCHECK(ncclCalloc(&rings, nranks*MAXCHANNELS));
NCCLCHECK(ncclTopoPostset(comm, nodesFirstRank, nodesTreePatterns, allTopoRanks, rings, &collNetGraph, nc));
free(allTopoRanks);
free(nodesTreePatterns);
free(nodesFirstRank);
free(allGather1Data);
free(allGather3Data);
// AllGather3 - end
TRACE(NCCL_INIT, "rank %d nranks %d - BUILT %d TREES/RINGS", rank, nranks, comm->nChannels);
char line[1024];
line[0]='\0';
for (int c=0; c<comm->nChannels; c++) {
struct ncclTree* tree = &comm->channels[c].tree;
snprintf(line+strlen(line), 1023-strlen(line), " [%d] %d/%d/%d->%d->%d",
c, tree->down[0], tree->down[1], tree->down[2], rank, tree->up);
INFO(NCCL_GRAPH, "Ring %d : %d -> %d -> %d", c, comm->channels[c].ring.prev, comm->rank, comm->channels[c].ring.next);
}
line[1023] = '\0';
INFO(NCCL_INIT, "Trees%s", line);
// Set Affinity to a CPU local the our GPU, so that all memory we allocate
// on the host is local.
cpu_set_t affinitySave;
sched_getaffinity(0, sizeof(cpu_set_t), &affinitySave);
NCCLCHECK(ncclTopoSetAffinity(comm->topo, comm->rank));
ncclResult_t ret;
NCCLCHECK(computeBuffSizes(comm));
// Connect with prev/next for each ring
for (int c=0; c<comm->nChannels; c++) {
struct ncclChannel* channel = comm->channels+c;
NCCLCHECKGOTO(setupChannel(comm, c, rank, nranks, rings+c*nranks), ret, affinity_restore);
if (comm->nRanks == 1) continue;
NCCLCHECKGOTO(ncclTransportP2pConnect(comm, channel, 1, &channel->ring.prev, 1, &channel->ring.next, 0), ret, affinity_restore);
}
NCCLCHECKGOTO(ncclTransportP2pSetup(comm, &ringGraph, 0), ret, affinity_restore);
INFO(NCCL_INIT, "Connected all rings");
// Connect Trees
for (int c=0; c<comm->nChannels; c++) {
struct ncclChannel* channel = comm->channels+c;
if (comm->nRanks == 1) continue;
NCCLCHECKGOTO(ncclTransportP2pConnect(comm, channel, NCCL_MAX_TREE_ARITY, channel->tree.down, 1, &channel->tree.up, 0), ret, affinity_restore);
NCCLCHECKGOTO(ncclTransportP2pConnect(comm, channel, 1, &channel->tree.up, NCCL_MAX_TREE_ARITY, channel->tree.down, 0), ret, affinity_restore);
}
NCCLCHECKGOTO(ncclTransportP2pSetup(comm, &treeGraph, 0), ret, affinity_restore);
INFO(NCCL_INIT, "Connected all trees");
// Check if we can setup CollNet
if (comm->collNetSupport > 0) {
int collNetSetupFail = 0;
// Find all head ranks
int nHeads = collNetGraph.nChannels;
int *heads;
NCCLCHECK(ncclCalloc(&heads, nHeads));
// Head GPU index is always 0
for (int c=0; c<nHeads; c++) {
heads[c] = collNetGraph.intra[c*comm->localRanks+0];
}
for (int c=0; c<comm->nChannels; c++) {
struct ncclChannel* channel = comm->channels+c;
for (int h=0; h<nHeads; h++) {
const int head = heads[h];
if (ncclTransportCollNetSetup(comm, &collNetGraph, channel, head, head, h, collNetRecv) != 1)
collNetSetupFail = 1;
else if (ncclTransportCollNetSetup(comm, &collNetGraph, channel, head, head, h, collNetSend) != 1)
collNetSetupFail = 1;
}
}
// Verify CollNet setup across ranks
NCCLCHECK(ncclTransportCollNetCheck(comm, collNetSetupFail));
if (comm->collNetSupport) {
TRACE(NCCL_INIT, "rank %d Connected inter-node CollNet", rank);
for (int c=0; c<comm->nChannels; c++) {
struct ncclChannel* channelRecv = comm->channels+c;
NCCLCHECK(ncclTransportP2pConnect(comm, channelRecv, NCCL_MAX_DIRECT_ARITY, channelRecv->collTree.up, NCCL_MAX_DIRECT_ARITY, channelRecv->collTree.down, 0));
}
NCCLCHECK(ncclTransportP2pSetup(comm, &collNetGraph, 0));
for (int c=0; c<comm->nChannels; c++) {
struct ncclChannel* channelSend = comm->channels+c;
NCCLCHECK(ncclTransportP2pConnect(comm, channelSend, NCCL_MAX_DIRECT_ARITY, channelSend->collTree.down, NCCL_MAX_DIRECT_ARITY, channelSend->collTree.up, 1));
}
NCCLCHECK(ncclTransportP2pSetup(comm, &collNetGraph, 1));
INFO(NCCL_INIT, "rank %d Connected CollNet", rank);
}
}
TRACE(NCCL_INIT, "rank %d nranks %d - CONNECTED %d RINGS AND TREES", rank, nranks, comm->nChannels);
free(rings);
// Compute time models for algorithm and protocol combinations
NCCLCHECK(ncclTopoTuneModel(comm, minCompCap, maxCompCap, &treeGraph, &ringGraph, &collNetGraph));
// Compute nChannels per peer for p2p
NCCLCHECK(ncclTopoComputeP2pChannels(comm));
NCCLCHECK(ncclCommSetIntra(comm, intraRank, intraRanks, intraRank0Comm));
if (comm->nNodes) NCCLCHECK(ncclProxyCreate(comm));
// We should have allocated all buffers, collective fifos, ... we can
// restore the affinity.
affinity_restore:
sched_setaffinity(0, sizeof(cpu_set_t), &affinitySave);
if (ret != ncclSuccess) return ret;
TRACE(NCCL_INIT, "rank %d nranks %d - DONE", rank, nranks);
return ncclSuccess;
}
NCCL_PARAM(SetStackSize, "SET_STACK_SIZE", 0);
ncclResult_t ncclCommInitRankSync(ncclComm_t* newcomm, int nranks, ncclUniqueId commId, int myrank, int cudaDev) {
ncclResult_t res;
CUDACHECK(hipSetDevice(cudaDev));
// Set the maximum kernel stack size of all kernels to avoid
// a CUDA memory reconfig on load (c.f. NVSHMEM issue)
//if (maxLocalSizeBytes > 0 && ncclParamSetStackSize() == 1) {
// TRACE(NCCL_INIT, "Setting hipLimitStackSize to %zi", maxLocalSizeBytes);
// CUDACHECKIGNORE(hipDeviceSetLimit(hipLimitStackSize, maxLocalSizeBytes));
//}
NCCLCHECKGOTO(commAlloc(newcomm, nranks, myrank), res, cleanup);
NCCLCHECKGOTO(initTransportsRank(*newcomm, &commId), res, cleanup);
NCCLCHECKGOTO(devCommSetup(*newcomm), res, cleanup);
INFO(NCCL_INIT,"comm %p rank %d nranks %d cudaDev %d busId %lx used %ld bytes - Init COMPLETE", *newcomm, myrank, nranks, (*newcomm)->cudaDev, (*newcomm)->busId, allocTracker[(*newcomm)->cudaDev].totalAllocSize);
return ncclSuccess;
cleanup:
if ((*newcomm) && (*newcomm)->bootstrap) bootstrapAbort((*newcomm)->bootstrap);
*newcomm = NULL;
return res;
}
static ncclResult_t ncclCommInitRankDev(ncclComm_t* newcomm, int nranks, ncclUniqueId commId, int myrank, int cudaDev) {
ncclResult_t res;
char* env = getenv("NCCL_COMM_ID");
if (env && myrank == 0) {
INFO(NCCL_ENV, "NCCL_COMM_ID set by environment to %s", env);
NCCLCHECKGOTO(bootstrapCreateRoot(&commId, true), res, end);
}
NCCLCHECKGOTO(ncclInit(), res, end);
if (myrank == 0) showVersion();
memset(allocTracker+cudaDev, 0, sizeof(struct allocationTracker));
// Make sure the CUDA runtime is initialized.
CUDACHECKGOTO(hipFree(NULL), res, end);
NCCLCHECKGOTO(PtrCheck(newcomm, "CommInitRank", "newcomm"), res, end);
if (nranks < 1 || myrank < 0 || myrank >= nranks) {
WARN("Invalid rank requested : %d/%d", myrank, nranks);
res = ncclInvalidArgument;
goto end;
}
if (ncclAsyncMode()) {
NCCLCHECKGOTO(ncclAsyncInit(ncclCommInitRankSync, newcomm, nranks, commId, myrank, cudaDev), res, end);
} else {
NCCLCHECKGOTO(ncclCommInitRankSync(newcomm, nranks, commId, myrank, cudaDev), res, end);
}
end:
if (ncclAsyncMode()) return ncclAsyncErrCheck(res);
else return res;
}
NCCL_API(ncclResult_t, ncclCommInitRank, ncclComm_t* newcomm, int nranks, ncclUniqueId commId, int myrank);
ncclResult_t ncclCommInitRank(ncclComm_t* newcomm, int nranks, ncclUniqueId commId, int myrank) {
NVTX3_FUNC_RANGE_IN(nccl_domain);
int cudaDev;
CUDACHECK(hipGetDevice(&cudaDev));
NCCLCHECK(ncclCommInitRankDev(newcomm, nranks, commId, myrank, cudaDev));
return ncclSuccess;
}
NCCL_API(ncclResult_t, ncclCommInitAll, ncclComm_t* comms, int ndev, const int* devlist);
ncclResult_t ncclCommInitAll(ncclComm_t* comms, int ndev, const int* devlist) {
NVTX3_FUNC_RANGE_IN(nccl_domain);
NCCLCHECK(PtrCheck(comms, "CommInitAll", "comms"));
if (ndev < 0) {
WARN("Invalid device count requested : %d", ndev);
return ncclInvalidArgument;
}
ncclUniqueId uniqueId;
NCCLCHECK(ncclGetUniqueId(&uniqueId));
NCCLCHECK(ncclGroupStart());
for (int i=0; i<ndev; i++) {
// Ignore return codes .. we need to call ncclGroupEnd to clean up anyway
ncclCommInitRankDev(comms+i, ndev, uniqueId, i, devlist ? devlist[i] : i);
}
NCCLCHECK(ncclGroupEnd());
return ncclSuccess;
}
static ncclResult_t commDestroy(ncclComm_t comm) {
int savedDevice;
#ifdef ENABLE_TRACE
int rank = comm->rank;
#endif
CUDACHECK(hipGetDevice(&savedDevice));
int commDevice = comm->cudaDev;
if (savedDevice != commDevice) {
CUDACHECK(hipSetDevice(commDevice));
}
TRACE(NCCL_INIT, "Destroying comm %p rank %d abortFlag %d fatalError %d", comm, comm->rank, LOAD(comm->abortFlag), comm->fatalError);
CUDACHECK(hipStreamSynchronize(comm->groupStream));
NCCLCHECK(ncclProxyDestroy(comm));
NCCLCHECK(commFree(comm));
if (savedDevice != commDevice)
CUDACHECK(hipSetDevice(savedDevice));
TRACE(NCCL_INIT, "Destroyed comm %p rank %d", comm, rank);
return ncclSuccess;
}
NCCL_API(ncclResult_t, ncclCommDestroy, ncclComm_t comm);
ncclResult_t ncclCommDestroy(ncclComm_t comm) {
NVTX3_FUNC_RANGE_IN(nccl_domain);
if (comm == NULL)
return ncclSuccess;
TRACE(NCCL_INIT, "comm %p rank %d nRanks %d cudaDev %d busId %lx", comm, comm->rank, comm->nRanks, comm->cudaDev, comm->busId);
// Try and prevent a double free of the comm struct (user error)
if (comm->rank == -1 || comm->nRanks <= 0 || comm->cudaDev == -1 || comm->busId == -1) {
WARN("comm %p has already been destroyed", comm);
return ncclInvalidArgument;
}
// [RCCL] Delete CliqueManager if it exists
if (comm->cliqueManager) delete comm->cliqueManager;
// [/RCCL]
return commDestroy(comm);
}
NCCL_API(ncclResult_t, ncclCommAbort, ncclComm_t comm);
ncclResult_t ncclCommAbort(ncclComm_t comm) {
NVTX3_FUNC_RANGE_IN(nccl_domain);
if (comm == NULL)
return ncclSuccess;
// Ask anything that might still be running on the device to quit
STORE(comm->abortFlag, 1);
// do not destroy comm because kernel maybe still running
// return commDestroy(comm);
return ncclSuccess;
}
NCCL_API(const char*, ncclGetErrorString, ncclResult_t code);
const char* ncclGetErrorString(ncclResult_t code) {
switch (code) {
case ncclSuccess : return "no error";
case ncclUnhandledCudaError : return "unhandled cuda error";
case ncclSystemError : return "unhandled system error";
case ncclInternalError : return "internal error";
case ncclInvalidArgument : return "invalid argument";
case ncclInvalidUsage : return "invalid usage";
default : return "unknown result code";
}
}
NCCL_API(ncclResult_t, ncclCommGetAsyncError, ncclComm_t comm, ncclResult_t *asyncError);
ncclResult_t ncclCommGetAsyncError(ncclComm_t comm, ncclResult_t *asyncError) {
NCCLCHECK(PtrCheck(comm, "ncclGetAsyncError", "comm"));
NCCLCHECK(PtrCheck(asyncError, "ncclGetAsyncError", "asyncError"));
*asyncError = comm->fatalError;
return ncclSuccess;
}
NCCL_API(ncclResult_t, ncclCommCount, const ncclComm_t comm, int* count);
ncclResult_t ncclCommCount(const ncclComm_t comm, int* count) {
NVTX3_FUNC_RANGE_IN(nccl_domain);
NCCLCHECK(PtrCheck(comm, "CommCount", "comm"));
NCCLCHECK(PtrCheck(count, "CommCount", "count"));
*count = comm->nRanks;
return ncclSuccess;
}
NCCL_API(ncclResult_t, ncclCommCuDevice, const ncclComm_t comm, int* devid);
ncclResult_t ncclCommCuDevice(const ncclComm_t comm, int* devid) {
NVTX3_FUNC_RANGE_IN(nccl_domain);
NCCLCHECK(PtrCheck(comm, "CommCuDevice", "comm"));
NCCLCHECK(PtrCheck(devid, "CommCuDevice", "devid"));
*devid = comm->cudaDev;
return ncclSuccess;
}
NCCL_API(ncclResult_t, ncclCommUserRank, const ncclComm_t comm, int* rank);
ncclResult_t ncclCommUserRank(const ncclComm_t comm, int* rank) {
NVTX3_FUNC_RANGE_IN(nccl_domain);
NCCLCHECK(PtrCheck(comm, "CommUserRank", "comm"));
NCCLCHECK(PtrCheck(rank, "CommUserRank", "rank"));
*rank = comm->rank;
return ncclSuccess;
}
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