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/*************************************************************************
* Copyright (c) 2016-2020, NVIDIA CORPORATION. All rights reserved.
*
* See LICENSE.txt for license information
************************************************************************/
#include "comm.h"
#include "shm.h"
struct shmConnectInfo {
uint64_t pidHash;
int id;
int sendRank;
int recvRank;
int shmSize;
};
struct shmSendResources {
int remShmSize;
struct ncclRecvMem* remHostMem;
struct ncclRecvMem* devRemHostMem;
int shmSize;
struct ncclSendMem* hostMem;
struct ncclSendMem* devHostMem;
};
struct shmRecvResources {
int remShmSize;
struct ncclSendMem* remHostMem;
struct ncclSendMem* devRemHostMem;
int shmSize;
struct ncclRecvMem* hostMem;
struct ncclRecvMem* devHostMem;
};
NCCL_PARAM(ShmDisable, "SHM_DISABLE", 0);
/* Determine two peers can communicate with SHM */
ncclResult_t shmCanConnect(int* ret, struct ncclTopoSystem* topo, struct ncclTopoGraph* graph, struct ncclPeerInfo* info1, struct ncclPeerInfo* info2) {
*ret = 0;
if (ncclParamShmDisable() == 1) return ncclSuccess;
// Same host?
TRACE(NCCL_INIT|NCCL_SHM, "peer1 hostHash %lx peer2 hostHash %lx", info1->hostHash, info2->hostHash);
if (info1->hostHash != info2->hostHash) return ncclSuccess;
// Common /dev/shm (between containers) ?
TRACE(NCCL_INIT|NCCL_SHM, "peer1 shmDev %lx peer2 shmDev %lx", info1->shmDev, info2->shmDev);
if (info1->shmDev != info2->shmDev) return ncclSuccess;
*ret = 1;
return ncclSuccess;
}
#define MAX_SHM_NAME_LEN 1024
/* Create and return connect structures for this peer to connect to me */
ncclResult_t shmSendSetup(struct ncclTopoSystem* topo, struct ncclTopoGraph* graph, struct ncclPeerInfo* myInfo, struct ncclPeerInfo* peerInfo, struct ncclConnect* connectInfo, struct ncclConnector* send, int channelId) {
struct shmSendResources* resources;
NCCLCHECK(ncclCalloc(&resources, 1));
send->transportResources = resources;
struct shmConnectInfo info;
info.id = channelId;
info.pidHash = myInfo->pidHash;
info.sendRank = myInfo->rank;
info.recvRank = peerInfo->rank;
char shmName[MAX_SHM_NAME_LEN];
sprintf(shmName, "nccl-shm-send-%lx-%d-%d-%d", info.pidHash, info.id, info.sendRank, info.recvRank);
info.shmSize = resources->shmSize = sizeof(struct ncclSendMem);
TRACE(NCCL_SHM,"Open shmName %s shmSize %d", shmName, info.shmSize);
NCCLCHECK(shmOpen(shmName, resources->shmSize, (void**)&resources->hostMem, (void**)&resources->devHostMem, 1));
INFO(NCCL_INIT|NCCL_SHM,"Channel %02d : %d[%lx] -> %d[%lx] via direct shared memory", channelId, myInfo->rank, myInfo->busId, peerInfo->rank, peerInfo->busId);
static_assert(sizeof(struct shmConnectInfo) <= sizeof(struct ncclConnect), "shm Connect Recv Info is too big");
memcpy(connectInfo, &info, sizeof(struct shmConnectInfo));
return ncclSuccess;
}
ncclResult_t shmRecvSetup(struct ncclTopoSystem* topo, struct ncclTopoGraph* graph, struct ncclPeerInfo* myInfo, struct ncclPeerInfo* peerInfo, struct ncclConnect* connectInfo, struct ncclConnector* recv, int channelId) {
struct shmRecvResources* resources;
NCCLCHECK(ncclCalloc(&resources, 1));
recv->transportResources = resources;
struct shmConnectInfo info;
info.id = channelId;
info.pidHash = myInfo->pidHash;
info.sendRank = peerInfo->rank;
info.recvRank = myInfo->rank;
char shmName[MAX_SHM_NAME_LEN];
sprintf(shmName, "nccl-shm-recv-%lx-%d-%d-%d", info.pidHash, info.id, info.sendRank, info.recvRank);
int shmSize = offsetof(struct ncclRecvMem, buff);
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) shmSize += recv->comm->buffSizes[p];
info.shmSize = resources->shmSize = shmSize;
TRACE(NCCL_SHM,"Open shmName %s shmSize %d", shmName, info.shmSize);
NCCLCHECK(shmOpen(shmName, resources->shmSize, (void**)&resources->hostMem, (void**)&resources->devHostMem, 1));
static_assert(sizeof(struct shmConnectInfo) <= sizeof(struct ncclConnect), "shm Connect Send Info is too big");
memcpy(connectInfo, &info, sizeof(struct shmConnectInfo));
return ncclSuccess;
}
/* Connect to this peer */
ncclResult_t shmSendConnect(struct ncclConnect* connectInfo, int nranks, int rank, struct ncclConnector* send) {
// Setup device pointers
struct shmConnectInfo* info = (struct shmConnectInfo*)connectInfo;
struct shmSendResources* resources = (struct shmSendResources*)send->transportResources;
char shmName[MAX_SHM_NAME_LEN];
sprintf(shmName, "nccl-shm-recv-%lx-%d-%d-%d", info->pidHash, info->id, info->sendRank, info->recvRank);
resources->remShmSize = info->shmSize;
TRACE(NCCL_SHM,"Open shmName %s shmSize %d", shmName, info->shmSize);
NCCLCHECK(shmOpen(shmName, resources->remShmSize, (void**)&resources->remHostMem, (void**)&resources->devRemHostMem, 0));
// Remove the file to ensure proper clean-up
NCCLCHECK(shmUnlink(shmName));
send->transportResources = resources;
int offset = 0;
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
send->conn.buffs[p] = resources->devRemHostMem->buff + offset;
offset += send->comm->buffSizes[p];
}
send->conn.tail = &resources->devRemHostMem->tail;
send->conn.opCountRem = &resources->devRemHostMem->opCount;
send->conn.head = &resources->devHostMem->head;
send->conn.opCountLoc = &resources->devHostMem->opCount;
return ncclSuccess;
}
ncclResult_t shmRecvConnect(struct ncclConnect* connectInfo, int nranks, int rank, struct ncclConnector* recv) {
// Setup device pointers
struct shmRecvResources* resources = (struct shmRecvResources*)recv->transportResources;
struct shmConnectInfo* info = (struct shmConnectInfo*)connectInfo;
char shmName[MAX_SHM_NAME_LEN];
sprintf(shmName, "nccl-shm-send-%lx-%d-%d-%d", info->pidHash, info->id, info->sendRank, info->recvRank);
resources->remShmSize = info->shmSize;
TRACE(NCCL_SHM,"Open shmName %s shmSize %d", shmName, info->shmSize);
NCCLCHECK(shmOpen(shmName, resources->remShmSize, (void**)&resources->remHostMem, (void**)&resources->devRemHostMem, 0));
NCCLCHECK(shmUnlink(shmName));
recv->conn.head = &resources->devRemHostMem->head;
recv->conn.opCountRem = &resources->devRemHostMem->opCount;
int offset = 0;
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
recv->conn.buffs[p] = resources->devHostMem->buff + offset;
offset += recv->comm->buffSizes[p];
}
recv->conn.tail = &resources->devHostMem->tail;
recv->conn.opCountLoc = &resources->devHostMem->opCount;
return ncclSuccess;
}
ncclResult_t shmSendFree(void* transportResources) {
struct shmSendResources* resources = (struct shmSendResources*)transportResources;
NCCLCHECK(shmClose(resources->hostMem, resources->devHostMem, resources->shmSize));
NCCLCHECK(shmClose(resources->remHostMem, resources->devRemHostMem, resources->remShmSize));
free(resources);
return ncclSuccess;
}
ncclResult_t shmRecvFree(void* transportResources) {
struct shmRecvResources* resources = (struct shmRecvResources*)transportResources;
NCCLCHECK(shmClose(resources->hostMem, resources->devHostMem, resources->shmSize));
NCCLCHECK(shmClose(resources->remHostMem, resources->devRemHostMem, resources->remShmSize));
free(resources);
return ncclSuccess;
}
struct ncclTransport shmTransport = {
"SHM",
shmCanConnect,
{ shmSendSetup, shmSendConnect, shmSendFree, NULL },
{ shmRecvSetup, shmRecvConnect, shmRecvFree, NULL }
};
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