BertanDogancay
439 řádky
18 KiB
C++
439 řádky
18 KiB
C++
/*************************************************************************
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* Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
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*
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* See LICENSE.txt for license information
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************************************************************************/
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#include "comm.h"
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#include "shm.h"
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struct shmConnectInfo {
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char shmName[7];
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int shmSize;
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};
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static_assert(sizeof(shmConnectInfo) <= CONNECT_SIZE, "SHM Connect info is too large");
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struct shmSendResources {
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int remShmSize;
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struct ncclRecvMem* remHostMem;
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struct ncclRecvMem* devRemHostMem;
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ncclShmHandle_t remHandle;
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int shmSize;
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struct ncclSendMem* hostMem;
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struct ncclSendMem* devHostMem;
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ncclShmHandle_t hostHandle;
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};
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struct shmRecvResources {
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int remShmSize;
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struct ncclSendMem* remHostMem;
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struct ncclSendMem* devRemHostMem;
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ncclShmHandle_t remHandle;
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int shmSize;
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struct ncclRecvMem* hostMem;
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struct ncclRecvMem* devHostMem;
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ncclShmHandle_t hostHandle;
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};
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#define SHM_SEND_SIDE 1
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#define SHM_RECV_SIDE 2
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NCCL_PARAM(ShmDisable, "SHM_DISABLE", 0);
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NCCL_PARAM(ShmUseCudaMemcpy, "SHM_USE_CUDA_MEMCPY", 0);
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NCCL_PARAM(ShmMemcpyMode, "SHM_MEMCPY_MODE", SHM_SEND_SIDE); // 1 is sender-side, 2 is receiver-side, 3 is both
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static int useMemcpySend = 0;
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static int useMemcpyRecv = 0;
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NCCL_PARAM(ShmLocality, "SHM_LOCALITY", SHM_RECV_SIDE); // 1 is sender-size, 2 is receiver-size
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static int shmLocality = 0;
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static void initCeOperation();
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/* Determine two peers can communicate with SHM */
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static ncclResult_t shmCanConnect(int* ret, struct ncclTopoSystem* topo, struct ncclTopoGraph* graph, struct ncclPeerInfo* info1, struct ncclPeerInfo* info2) {
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*ret = 0;
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initCeOperation();
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if (ncclParamShmDisable() == 1) return ncclSuccess;
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int useNet = 0;
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NCCLCHECK(ncclTopoCheckNet(topo, info1->busId, info2->busId, &useNet));
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if (useNet) return ncclSuccess;
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// Same host?
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TRACE(NCCL_INIT|NCCL_SHM, "peer1 hostHash %lx peer2 hostHash %lx", info1->hostHash, info2->hostHash);
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if (info1->hostHash != info2->hostHash) return ncclSuccess;
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// Common /dev/shm (between containers) ?
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TRACE(NCCL_INIT|NCCL_SHM, "peer1 shmDev %lx peer2 shmDev %lx", info1->shmDev, info2->shmDev);
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if (info1->shmDev != info2->shmDev) return ncclSuccess;
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*ret = 1;
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return ncclSuccess;
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}
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#define MAX_SHM_NAME_LEN 1024
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/* Create and return connect structures for this peer to connect to me */
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static ncclResult_t shmSendSetup(struct ncclComm* comm, struct ncclTopoGraph* graph, struct ncclPeerInfo* myInfo, struct ncclPeerInfo* peerInfo, struct ncclConnect* connectInfo, struct ncclConnector* send, int channelId, int connIndex) {
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struct shmSendResources* resources;
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NCCLCHECK(ncclCalloc(&resources, 1));
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send->transportResources = resources;
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static_assert(sizeof(struct shmConnectInfo) <= sizeof(struct ncclConnect), "shm Connect Info is too big");
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struct shmConnectInfo* info = (struct shmConnectInfo*)connectInfo;
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char shmPath[PATH_MAX];
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shmPath[0] = '\0';
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int shmSize = sizeof(struct ncclSendMem);
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if (shmLocality == SHM_SEND_SIDE) {
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for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) shmSize += comm->buffSizes[p];
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}
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info->shmSize = resources->shmSize = shmSize;
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NCCLCHECK(ncclShmOpen(shmPath, resources->shmSize, (void**)&resources->hostMem, (void**)&resources->devHostMem, 1, &resources->hostHandle));
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TRACE(NCCL_SHM,"Opened shmName %s shmSize %d", shmPath, info->shmSize);
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memcpy(info->shmName, shmPath+sizeof("/dev/shm/nccl-")-1, sizeof(info->shmName));
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INFO(NCCL_INIT|NCCL_SHM,"Channel %02d : %d[%lx] -> %d[%lx] via SHM/%s/%s comm %p nRanks %02d", channelId, myInfo->rank, myInfo->busId, peerInfo->rank, peerInfo->busId, useMemcpySend?"CE":"direct", useMemcpyRecv?"CE":"direct", comm, comm->nRanks);
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return ncclSuccess;
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}
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static ncclResult_t shmRecvSetup(struct ncclComm* comm, struct ncclTopoGraph* graph, struct ncclPeerInfo* myInfo, struct ncclPeerInfo* peerInfo, struct ncclConnect* connectInfo, struct ncclConnector* recv, int channelId, int connIndex) {
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struct shmRecvResources* resources;
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NCCLCHECK(ncclCalloc(&resources, 1));
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recv->transportResources = resources;
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static_assert(sizeof(struct shmConnectInfo) <= sizeof(struct ncclConnect), "shm Connect Info is too big");
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struct shmConnectInfo* info = (struct shmConnectInfo*)connectInfo;
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char shmPath[PATH_MAX];
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shmPath[0] = '\0';
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int shmSize = sizeof(struct ncclRecvMem);
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if (shmLocality == SHM_RECV_SIDE) {
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for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) shmSize += comm->buffSizes[p];
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}
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info->shmSize = resources->shmSize = shmSize;
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NCCLCHECK(ncclShmOpen(shmPath, resources->shmSize, (void**)&resources->hostMem, (void**)&resources->devHostMem, 1, &resources->hostHandle));
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TRACE(NCCL_SHM,"Opened shmName %s shmSize %d", shmPath, info->shmSize);
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memcpy(info->shmName, shmPath+sizeof("/dev/shm/nccl-")-1, sizeof(info->shmName));
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return ncclSuccess;
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}
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struct shmProxyInfo {
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struct ncclRecvMem* ceRecvMem;
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char* devFifo;
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char* shmFifo;
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struct ncclSendMem* sendMem;
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struct ncclRecvMem* recvMem;
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// used by progress only
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uint64_t step;
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cudaStream_t stream;
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cudaEvent_t events[NCCL_STEPS];
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};
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/* Connect to this peer */
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static ncclResult_t shmSendConnect(struct ncclComm* comm, struct ncclConnect* connectInfo, int nranks, int rank, struct ncclConnector* send) {
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// Setup device pointers
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struct shmConnectInfo* info = (struct shmConnectInfo*)connectInfo;
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struct shmSendResources* resources = (struct shmSendResources*)send->transportResources;
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char shmPath[PATH_MAX];
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sprintf(shmPath, "/dev/shm/nccl-%s", info->shmName);
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resources->remShmSize = info->shmSize;
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TRACE(NCCL_SHM,"Open shmName %s shmSize %d", shmPath, info->shmSize);
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NCCLCHECK(ncclShmOpen(shmPath, resources->remShmSize, (void**)&resources->remHostMem, (void**)&resources->devRemHostMem, -1, &resources->remHandle));
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char* buff = shmLocality == SHM_SEND_SIDE ? (char*)(resources->devHostMem+1) : (char*)(resources->devRemHostMem+1);
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for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
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send->conn.buffs[p] = buff;
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buff += comm->buffSizes[p];
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}
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send->conn.tail = &resources->devRemHostMem->tail;
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send->conn.head = &resources->devHostMem->head;
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if (useMemcpyRecv) {
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send->conn.connFifo = resources->devRemHostMem->connFifo;
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}
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if (useMemcpySend) {
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int tpProxyRank;
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tpProxyRank = comm->topParentRanks[comm->rank];
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NCCLCHECK(ncclProxyConnect(comm, TRANSPORT_SHM, 1, tpProxyRank, &send->proxyConn));
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struct shmProxyInfo proxyInfo = { NULL, NULL, send->conn.buffs[NCCL_PROTO_SIMPLE], resources->hostMem, resources->remHostMem };
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NCCLCHECK(ncclProxyCallBlocking(comm, &send->proxyConn, ncclProxyMsgConnect, &proxyInfo, sizeof(struct shmProxyInfo), &proxyInfo, sizeof(struct shmProxyInfo)));
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send->conn.buffs[NCCL_PROTO_SIMPLE] = proxyInfo.devFifo;
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send->conn.tail = &proxyInfo.ceRecvMem->tail;
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send->conn.connFifo = proxyInfo.ceRecvMem->connFifo;
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}
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// We must assign the proxyConn's proxyProgress property for proper checking at enqueue-time
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send->proxyConn.proxyProgress = shmTransport.send.proxyProgress;
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return ncclSuccess;
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}
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static ncclResult_t shmRecvConnect(struct ncclComm* comm, struct ncclConnect* connectInfo, int nranks, int rank, struct ncclConnector* recv) {
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// Setup device pointers
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struct shmRecvResources* resources = (struct shmRecvResources*)recv->transportResources;
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struct shmConnectInfo* info = (struct shmConnectInfo*)connectInfo;
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char shmPath[PATH_MAX];
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sprintf(shmPath, "/dev/shm/nccl-%s", info->shmName);
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resources->remShmSize = info->shmSize;
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TRACE(NCCL_SHM,"Open shmName %s shmSize %d", shmPath, info->shmSize);
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NCCLCHECK(ncclShmOpen(shmPath, resources->remShmSize, (void**)&resources->remHostMem, (void**)&resources->devRemHostMem, -1, &resources->remHandle));
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char* buff = shmLocality == SHM_RECV_SIDE ? (char*)(resources->devHostMem+1) : (char*)(resources->devRemHostMem+1);
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for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
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recv->conn.buffs[p] = buff;
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buff += comm->buffSizes[p];
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}
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recv->conn.head = &resources->devRemHostMem->head;
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recv->conn.tail = &resources->devHostMem->tail;
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if (useMemcpyRecv) {
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NCCLCHECK(ncclProxyConnect(comm, TRANSPORT_SHM, 0, comm->rank, &recv->proxyConn));
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struct shmProxyInfo proxyInfo = { NULL, NULL, recv->conn.buffs[NCCL_PROTO_SIMPLE], resources->remHostMem, resources->hostMem };
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NCCLCHECK(ncclProxyCallBlocking(comm, &recv->proxyConn, ncclProxyMsgConnect, &proxyInfo, sizeof(struct shmProxyInfo), &proxyInfo, sizeof(struct shmProxyInfo)));
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recv->conn.buffs[NCCL_PROTO_SIMPLE] = proxyInfo.devFifo;
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recv->conn.tail = &proxyInfo.ceRecvMem->tail;
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}
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// We must assign the proxyConn's proxyProgress property for proper checking at enqueue-time
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recv->proxyConn.proxyProgress = shmTransport.recv.proxyProgress;
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return ncclSuccess;
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}
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static ncclResult_t shmSendFree(struct ncclConnector* send) {
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struct shmRecvResources* resources = (struct shmRecvResources*)send->transportResources;
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if (resources) {
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NCCLCHECK(ncclShmClose(resources->hostHandle));
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NCCLCHECK(ncclShmClose(resources->remHandle));
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free(resources);
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}
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return ncclSuccess;
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}
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static ncclResult_t shmRecvFree(struct ncclConnector* recv) {
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struct shmRecvResources* resources = (struct shmRecvResources*)recv->transportResources;
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if (resources) {
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NCCLCHECK(ncclShmClose(resources->hostHandle));
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NCCLCHECK(ncclShmClose(resources->remHandle));
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free(resources);
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}
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return ncclSuccess;
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}
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static ncclResult_t shmSendProxyConnect(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState, void* reqBuff, int reqSize, void* respBuff, int respSize, int* done) {
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struct shmProxyInfo* proxyInfo;
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NCCLCHECK(ncclCalloc(&proxyInfo, 1));
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if (reqSize != sizeof(struct shmProxyInfo)) return ncclInternalError;
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memcpy(proxyInfo, reqBuff, reqSize);
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NCCLCHECK(ncclCudaCalloc(&proxyInfo->devFifo, proxyState->buffSizes[NCCL_PROTO_SIMPLE], nullptr));
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NCCLCHECK(ncclCudaHostCalloc(&proxyInfo->ceRecvMem, 1));
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CUDACHECK(cudaStreamCreateWithFlags(&proxyInfo->stream, cudaStreamNonBlocking));
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for (int i=0; i<NCCL_STEPS; i++) {
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CUDACHECK(cudaEventCreate(proxyInfo->events+i));
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}
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connection->proxyAppendPtr = &connection->proxyAppend;
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connection->transportResources = proxyInfo;
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if (respSize != sizeof(struct shmProxyInfo)) return ncclInternalError;
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memcpy(respBuff, proxyInfo, respSize);
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return ncclSuccess;
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}
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static ncclResult_t shmRecvProxyConnect(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState, void* reqBuff, int reqSize, void* respBuff, int respSize, int* done) {
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struct shmProxyInfo* proxyInfo;
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NCCLCHECK(ncclCalloc(&proxyInfo, 1));
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if (reqSize != sizeof(struct shmProxyInfo)) return ncclInternalError;
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memcpy(proxyInfo, reqBuff, reqSize);
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NCCLCHECK(ncclCudaCalloc(&proxyInfo->devFifo, proxyState->buffSizes[NCCL_PROTO_SIMPLE], nullptr));
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NCCLCHECK(ncclCudaHostCalloc(&proxyInfo->ceRecvMem, 1));
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CUDACHECK(cudaStreamCreateWithFlags(&proxyInfo->stream, cudaStreamNonBlocking));
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for (int i=0; i<NCCL_STEPS; i++) {
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CUDACHECK(cudaEventCreate(proxyInfo->events+i));
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}
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connection->proxyAppendPtr = &connection->proxyAppend;
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connection->transportResources = proxyInfo;
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if (respSize != sizeof(struct shmProxyInfo)) return ncclInternalError;
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memcpy(respBuff, proxyInfo, respSize);
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return ncclSuccess;
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}
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static ncclResult_t shmSendProxyFree(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState) {
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struct shmProxyInfo* resources = (struct shmProxyInfo*)connection->transportResources;
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if (resources) {
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CUDACHECK(cudaStreamDestroy(resources->stream));
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NCCLCHECK(ncclCudaFree(resources->devFifo));
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NCCLCHECK(ncclCudaHostFree(resources->ceRecvMem));
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for (int i=0; i<NCCL_STEPS; i++) {
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CUDACHECK(cudaEventDestroy(resources->events[i]));
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}
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free(connection->transportResources);
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}
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return ncclSuccess;
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}
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static ncclResult_t shmRecvProxyFree(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState) {
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struct shmProxyInfo* resources = (struct shmProxyInfo*)connection->transportResources;
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if (resources) {
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CUDACHECK(cudaStreamDestroy(resources->stream));
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NCCLCHECK(ncclCudaFree(resources->devFifo));
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NCCLCHECK(ncclCudaHostFree(resources->ceRecvMem));
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for (int i=0; i<NCCL_STEPS; i++) {
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CUDACHECK(cudaEventDestroy(resources->events[i]));
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}
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free(connection->transportResources);
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}
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return ncclSuccess;
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}
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static ncclResult_t shmSendProxyProgress(struct ncclProxyState* proxyState, struct ncclProxyArgs* args) {
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if (args->state == ncclProxyOpReady) {
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for (int s=0; s<args->nsubs; s++) {
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struct ncclProxySubArgs* sub = args->subs+s;
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struct shmProxyInfo* resources = (struct shmProxyInfo*) (sub->connection->transportResources);
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// Round to next multiple of sliceSteps
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sub->base = ROUNDUP(resources->step, args->chunkSteps);
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sub->posted = sub->transmitted = sub->done = 0;
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}
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args->state = ncclProxyOpProgress;
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}
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args->idle = 1;
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if (args->state == ncclProxyOpProgress) {
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int p = args->protocol;
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int stepSize = proxyState->buffSizes[p] / NCCL_STEPS;
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for (int s=0; s<args->nsubs; s++) {
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struct ncclProxySubArgs* sub = args->subs+s;
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struct shmProxyInfo* resources = (struct shmProxyInfo*) (sub->connection->transportResources);
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if (p != NCCL_PROTO_SIMPLE) { // Only Simple uses cudaMemcpy
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resources->step = sub->base + sub->nsteps;
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args->done++;
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continue;
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}
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if (sub->transmitted < sub->done + NCCL_STEPS && sub->transmitted < sub->nsteps) {
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int buffSlot = (sub->base+sub->transmitted)%NCCL_STEPS;
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volatile struct ncclConnFifo* connFifo = resources->ceRecvMem->connFifo;
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volatile uint64_t* recvTail = &resources->ceRecvMem->tail;
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// Check GPU has sent everything
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if ((*recvTail > sub->base+sub->transmitted)) {
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int size = connFifo[buffSlot].size;
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CUDACHECK(cudaMemcpyAsync(resources->shmFifo+buffSlot*stepSize, resources->devFifo+buffSlot*stepSize, size, cudaMemcpyDeviceToHost, resources->stream));
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CUDACHECK(cudaEventRecord(resources->events[buffSlot], resources->stream));
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resources->recvMem->connFifo[buffSlot].size = size;
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__sync_synchronize(); // make sure connFifo[].size is visible
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sub->transmitted += args->sliceSteps;
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}
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}
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if (sub->done < sub->transmitted) {
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int buffSlot = (sub->base+sub->done)%NCCL_STEPS;
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cudaError_t res = cudaEventQuery(resources->events[buffSlot]);
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if (res != cudaErrorNotReady) CUDACHECK(res);
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if (res == cudaSuccess) {
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sub->done += args->sliceSteps;
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// Notify SHM
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resources->recvMem->tail = sub->base + sub->done;
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}
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if (sub->done == sub->nsteps) {
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resources->step = sub->base + sub->nsteps;
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args->done++;
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}
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}
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}
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if (args->done == args->nsubs) {
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args->state = ncclProxyOpNone;
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}
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}
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return ncclSuccess;
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}
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static ncclResult_t shmRecvProxyProgress(struct ncclProxyState* proxyState, struct ncclProxyArgs* args) {
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if (args->state == ncclProxyOpReady) {
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for (int s=0; s<args->nsubs; s++) {
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struct ncclProxySubArgs* sub = args->subs+s;
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struct shmProxyInfo* resources = (struct shmProxyInfo*) (sub->connection->transportResources);
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// Round to next multiple of sliceSteps
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sub->base = ROUNDUP(resources->step, args->chunkSteps);
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sub->posted = sub->transmitted = sub->done = 0;
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}
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args->state = ncclProxyOpProgress;
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}
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args->idle = 1;
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if (args->state == ncclProxyOpProgress) {
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int p = args->protocol;
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int stepSize = proxyState->buffSizes[p] / NCCL_STEPS;
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for (int s=0; s<args->nsubs; s++) {
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struct ncclProxySubArgs* sub = args->subs+s;
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struct shmProxyInfo* resources = (struct shmProxyInfo*) (sub->connection->transportResources);
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if (p != NCCL_PROTO_SIMPLE) { // Only Simple uses cudaMemcpy
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resources->step = sub->base + sub->nsteps;
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args->done++;
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continue;
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}
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if (sub->transmitted < sub->done + NCCL_STEPS && sub->transmitted < sub->nsteps) {
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int buffSlot = (sub->base+sub->transmitted)%NCCL_STEPS;
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volatile struct ncclConnFifo* connFifo = resources->recvMem->connFifo;
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volatile uint64_t* recvTail = &resources->recvMem->tail;
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// Check data is ready in SHM
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if ((*recvTail > sub->base+sub->transmitted)) {
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int size = connFifo[buffSlot].size;
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CUDACHECK(cudaMemcpyAsync(resources->devFifo+buffSlot*stepSize, resources->shmFifo+buffSlot*stepSize, size, cudaMemcpyHostToDevice, resources->stream));
|
|
CUDACHECK(cudaEventRecord(resources->events[buffSlot], resources->stream));
|
|
sub->transmitted += args->sliceSteps;
|
|
}
|
|
}
|
|
if (sub->done < sub->transmitted) {
|
|
int buffSlot = (sub->base+sub->done)%NCCL_STEPS;
|
|
cudaError_t res = cudaEventQuery(resources->events[buffSlot]);
|
|
if (res != cudaErrorNotReady) CUDACHECK(res);
|
|
if (res == cudaSuccess) {
|
|
sub->done += args->sliceSteps;
|
|
// Notify GPU
|
|
resources->ceRecvMem->tail = sub->base + sub->done;
|
|
}
|
|
if (sub->done == sub->nsteps) {
|
|
resources->step = sub->base + sub->nsteps;
|
|
args->done++;
|
|
}
|
|
}
|
|
}
|
|
if (args->done == args->nsubs) {
|
|
args->state = ncclProxyOpNone;
|
|
}
|
|
}
|
|
return ncclSuccess;
|
|
}
|
|
|
|
struct ncclTransport shmTransport = {
|
|
"SHM",
|
|
shmCanConnect,
|
|
{ shmSendSetup, shmSendConnect, shmSendFree, NULL, NULL, NULL, NULL, NULL },
|
|
{ shmRecvSetup, shmRecvConnect, shmRecvFree, NULL, NULL, NULL, NULL, NULL }
|
|
};
|
|
|
|
static void initCeOperation() {
|
|
static int init = 0;
|
|
if (!init) {
|
|
useMemcpySend = ncclParamShmUseCudaMemcpy() && (ncclParamShmMemcpyMode() & 1);
|
|
useMemcpyRecv = ncclParamShmUseCudaMemcpy() && (ncclParamShmMemcpyMode() & 2);
|
|
if (useMemcpySend) {
|
|
shmTransport.send.proxyConnect = shmSendProxyConnect;
|
|
shmTransport.send.proxyFree = shmSendProxyFree;
|
|
shmTransport.send.proxyProgress = shmSendProxyProgress;
|
|
}
|
|
if (useMemcpyRecv) {
|
|
shmTransport.recv.proxyConnect = shmRecvProxyConnect;
|
|
shmTransport.recv.proxyFree = shmRecvProxyFree;
|
|
shmTransport.recv.proxyProgress = shmRecvProxyProgress;
|
|
}
|
|
shmLocality = ncclParamShmLocality();
|
|
if (shmLocality != SHM_SEND_SIDE && shmLocality != SHM_RECV_SIDE) {
|
|
WARN("Ignoring SHM locality, must be 1 (sender side) or 2 (receiver side, default)");
|
|
shmLocality = SHM_RECV_SIDE;
|
|
}
|
|
init = 1;
|
|
}
|
|
}
|