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p2p.cc
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/*************************************************************************
* Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
*
* See LICENSE.txt for license information
************************************************************************/
#include "comm.h"
#include "graph.h"
#include "utils.h"
#include "shmutils.h"
#include "p2p.h"
#include "transport.h"
#include <assert.h>
#include "shm.h"
enum p2pType { P2P_DIRECT, P2P_INTERMEDIATE, P2P_IPC, P2P_CUMEM };
struct ncclP2pBuff {
void* directPtr;
size_t size;
ncclIpcDesc ipcDesc;
};
struct ncclP2pRequest {
size_t size;
int refcount;
};
struct p2pConnectInfo {
int rank;
int read;
struct ncclP2pBuff p2pBuff;
// Used by CE memcpy
ncclShmIpcDesc_t desc;
};
static_assert(sizeof(struct p2pConnectInfo) <= CONNECT_SIZE, "p2pConnectInfo is too large");
struct p2pIpcExpInfo {
ncclIpcDesc ipcDesc;
bool legacyIpcCap;
int impFd;
size_t size;
uintptr_t offset;
};
struct p2pShm {
struct ncclSendMem sendMem;
struct ncclRecvMem recvMem;
};
struct p2pShmProxyInfo {
// Shared memory between proxy and receiving GPU
struct p2pShm* shm;
struct p2pShm* devShm;
ncclShmIpcDesc_t desc;
// Intermediate step for sender
struct ncclRecvMem* ceRecvMem;
char* ceDevBuff;
// Receiver buffer
char* recvFifo;
// Used by CE memcpy progress only
uint64_t step;
cudaStream_t stream;
cudaEvent_t events[NCCL_STEPS];
};
static_assert(sizeof(p2pConnectInfo) <= CONNECT_SIZE, "P2P Connect info is too large");
struct p2pResources {
enum p2pType type;
union {
struct ncclSendMem* sendDevMem;
struct ncclRecvMem* recvDevMem;
};
void* sendMemIpc;
int sendMemSameProc;
void* recvMemIpc;
int recvMemSameProc;
// CE memcpy support
struct p2pShmProxyInfo proxyInfo;
struct p2pShm* shm;
struct p2pShm* devShm;
ncclShmIpcDesc_t desc;
};
// cuMem API support
struct p2pCuMemProxyInfo {
struct ncclP2pBuff p2pBuff;
};
#include <sys/types.h>
NCCL_PARAM(LegacyCudaRegister, "LEGACY_CUDA_REGISTER", 0);
/* Convert a PCI busId string into a local cudaDev device index (cf. CUDA_VISIBLE_DEVICES) */
static int busIdToCudaDev(int64_t busId) {
int ndev;
if (cudaGetDeviceCount(&ndev) != cudaSuccess)
return -1;
for (int i = 0; i < ndev; i++) {
char devBusIdStr[NVML_DEVICE_PCI_BUS_ID_BUFFER_SIZE];
if (cudaDeviceGetPCIBusId(devBusIdStr, NVML_DEVICE_PCI_BUS_ID_BUFFER_SIZE, i) != cudaSuccess)
return -1;
int64_t devBusId;
NCCLCHECK(busIdToInt64(devBusIdStr, &devBusId));
if (busId == devBusId) return i;
}
// BusId was not found in our locally visible CUDA devices
return -1;
}
// CE memcpy support
NCCL_PARAM(P2pUseCudaMemcpy, "P2P_USE_CUDA_MEMCPY", 0);
static int useMemcpy = 0;
static void initCeOperation();
extern int64_t ncclParamMNNVLEnable();
/* Determine if two peers can communicate through p2p */
ncclResult_t p2pCanConnect(int* ret, struct ncclComm* comm, struct ncclTopoGraph* graph, struct ncclPeerInfo* info1, struct ncclPeerInfo* info2) {
initCeOperation();
// Check topology / p2p level.
int intermediateRank;
NCCLCHECK(ncclTopoCheckP2p(comm, comm->topo, info1->rank, info2->rank, ret, NULL, &intermediateRank));
if (*ret == 0) return ncclSuccess;
if (intermediateRank != -1) {
if (useMemcpy) *ret = 0;
return ncclSuccess;
}
// Check if NET would work better
int useNet = 0;
NCCLCHECK(ncclTopoCheckNet(comm->topo, info1->rank, info2->rank, &useNet));
if (useNet) {
*ret = 0;
return ncclSuccess;
}
if (info1->hostHash != comm->peerInfo[comm->rank].hostHash ||
info1->hostHash != info2->hostHash) {
// If either peer is non-local then we are done.
return ncclSuccess;
}
// Convert the peer's busId into a local cudaDev index (cf. CUDA_VISIBLE_DEVICES)
int cudaDev1 = busIdToCudaDev(info1->busId);
int cudaDev2 = busIdToCudaDev(info2->busId);
if (cudaDev1 == -1 || cudaDev2 == -1) {
#if CUDART_VERSION >= 10010
// CUDA 10.1 and later can use P2P with invisible devices.
return ncclSuccess;
#else
// Peer's CUDA device is not visible in this process : we can't communicate with it.
*ret = 0;
return ncclSuccess;
#endif
}
// Check that CUDA can do P2P
int p2p;
if (cudaDeviceCanAccessPeer(&p2p, cudaDev1, cudaDev2) != cudaSuccess) {
INFO(NCCL_INIT|NCCL_P2P,"peer query failed between dev %d(=%lx) and dev %d(=%lx)",
cudaDev1, info1->busId, cudaDev2, info2->busId);
*ret = 0;
return ncclSuccess;
}
// This will always fail when using NCCL_CUMEM_ENABLE=1
if (p2p != 0 && !ncclCuMemEnable()) {
// Cached result of the legacyIPC detection
static int legacyIPC = -1;
if (legacyIPC >= 0) {
*ret = legacyIPC;
return ncclSuccess;
}
// Check that legacy IPC support is available (WSL WAR)
char *dummy;
cudaIpcMemHandle_t ipc;
NCCLCHECK(ncclCudaMalloc(&dummy, CUDA_IPC_MIN));
if (cudaIpcGetMemHandle(&ipc, dummy) != cudaSuccess) {
INFO(NCCL_INIT|NCCL_P2P,"Legacy IPC not supported");
*ret = 0;
}
NCCLCHECK(ncclCudaFree(dummy));
legacyIPC = *ret;
return ncclSuccess;
}
if (p2p == 0) {
INFO(NCCL_INIT|NCCL_P2P,"Could not enable P2P between dev %d(=%lx) and dev %d(=%lx)",
cudaDev1, info1->busId, cudaDev2, info2->busId);
*ret = 0;
return ncclSuccess;
}
return ncclSuccess;
}
#define TRACE_DUMP_IPC(DEVIPC) \
do { \
unsigned long *devIpc = (unsigned long *) (DEVIPC); \
TRACE(P2P,"IPC: %016lx %016lx %016lx %016lx", devIpc[0], devIpc[1], devIpc[2], devIpc[3]); \
TRACE(P2P,"IPC: %016lx %016lx %016lx %016lx", devIpc[4], devIpc[5], devIpc[6], devIpc[7]); \
} while (0)
// cuMem API support
ncclResult_t ncclP2pAllocateShareableBuffer(size_t size, int refcount, ncclIpcDesc *ipcDesc, void **ptr) {
if (ncclCuMemEnable()) {
#if CUDART_VERSION >= 11030
CUmemAllocationHandleType type = ncclCuMemHandleType;
// cuMem API support
CUmemGenericAllocationHandle handle;
NCCLCHECK(ncclCuMemAlloc(ptr, &handle, type, size));
if (type == CU_MEM_HANDLE_TYPE_POSIX_FILE_DESCRIPTOR) {
// Return the native cuMem handle for later Export/Import via UDS
memcpy(&ipcDesc->cuDesc.data, &handle, sizeof(handle));
} else {
CUCHECK(cuMemExportToShareableHandle(&ipcDesc->cuDesc, handle, type, 0));
}
if (refcount) {
memcpy(&ipcDesc->memHandle, &handle, sizeof(handle));
for (int r = 0; r < refcount; ++r) CUCHECK(cuMemRetainAllocationHandle(&handle, *ptr));
}
#else
return ncclInternalError;
#endif
} else {
// Allocate a CUDA buffer and generate an IPC handle for it
NCCLCHECK(ncclCudaCalloc((char **)ptr, size));
cudaError_t res = cudaIpcGetMemHandle(&ipcDesc->devIpc, *ptr);
if (res != cudaSuccess) {
WARN("cudaIpcGetMemHandle failed : %s", cudaGetErrorString(res));
ncclCudaFree(*ptr);
CUDACHECK(res);
}
}
INFO(NCCL_P2P|NCCL_ALLOC, "Allocated shareable buffer %p size %zu ipcDesc %p", *ptr, size, ipcDesc);
return ncclSuccess;
}
ncclResult_t ncclP2pFreeShareableBuffer(ncclIpcDesc *ipcDesc) {
return ncclSuccess;
}
ncclResult_t ncclP2pImportShareableBuffer(struct ncclComm *comm, int peer, size_t size, ncclIpcDesc *ipcDesc, void **devMemPtr) {
if (ncclCuMemEnable()) {
#if CUDART_VERSION >= 11030
// cuMem API support
CUdeviceptr dptr = 0;
CUmemAllocationHandleType type = ncclCuMemHandleType;
CUmemGenericAllocationHandle handle;
ncclCuDesc *cuDesc = &ipcDesc->cuDesc;
CUmemAllocationProp prop = {};
size_t granularity = 0;
prop.type = CU_MEM_ALLOCATION_TYPE_PINNED;
prop.location.type = CU_MEM_LOCATION_TYPE_DEVICE;
prop.requestedHandleTypes = type;
prop.location.id = comm->cudaDev;
CUCHECK(cuMemGetAllocationGranularity(&granularity, &prop, CU_MEM_ALLOC_GRANULARITY_MINIMUM));
ALIGN_SIZE(size, granularity);
// Import and map the remote memory descriptor to the local GPU
if (type == CU_MEM_HANDLE_TYPE_POSIX_FILE_DESCRIPTOR) {
// UDS fd support
int fd = -1;
// Send cuMem handle to remote for conversion to an fd
NCCLCHECK(ncclProxyClientGetFdBlocking(comm, peer, &cuDesc->data, &fd));
INFO(NCCL_P2P, "UDS converted handle 0x%lx to fd %d on remote peer %d", *(uint64_t*)&cuDesc->data, fd, peer);
CUCHECK(cuMemImportFromShareableHandle(&handle, (void *)(uintptr_t)fd, type));
SYSCHECK(close(fd), "close");
} else {
CUCHECK(cuMemImportFromShareableHandle(&handle, cuDesc, type));
}
CUCHECK(cuMemAddressReserve(&dptr, size, /* alignment */ 0, /* addr */ 0, /* flags */ 0));
CUCHECK(cuMemMap(dptr, size, /* offset */ 0, handle, /* flags */ 0));
TRACE(NCCL_P2P, "Imported shareable buffer size %zu handle 0x%llx dptr %p", size, handle, (void*)dptr);
// Allow access by the local GPU
CUmemAccessDesc accessDesc = {};
accessDesc.location.type = CU_MEM_LOCATION_TYPE_DEVICE;
accessDesc.location.id = comm->cudaDev;
accessDesc.flags = CU_MEM_ACCESS_FLAGS_PROT_READWRITE;
CUCHECK(cuMemSetAccess(dptr, size, &accessDesc, 1));
TRACE(NCCL_P2P, "Set Access for %p size %zu on dev %d", (void*)dptr, size, accessDesc.location.id);
*devMemPtr = (void *)dptr;
#else
return ncclInternalError;
#endif
} else {
// Legacy CUDA IPC
CUDACHECK(cudaIpcOpenMemHandle(devMemPtr, ipcDesc->devIpc, cudaIpcMemLazyEnablePeerAccess));
}
INFO(NCCL_P2P, "Imported shareable buffer device %d size %zu ptr %p", comm->cudaDev, size, *devMemPtr);
return ncclSuccess;
}
// Setting this to non zero causes P2P to use Reads rather than Writes
NCCL_PARAM(P2pReadEnable, "P2P_READ_ENABLE", -2);
NCCL_PARAM(P2pDirectDisable, "P2P_DIRECT_DISABLE", 0);
#define P2P_SAME_PID(MYINFO, PEERINFO) ((MYINFO->hostHash == PEERINFO->hostHash) && (MYINFO->pidHash == PEERINFO->pidHash))
static ncclResult_t p2pGetInfo(struct ncclComm* comm, struct ncclPeerInfo* info1, struct ncclPeerInfo* info2, int* read, int* intermediateRank) {
int p2p;
// Queries the topology to see if the GPUs are Ampere and
// connected via NVLink, if so we enable P2P Read by default
NCCLCHECK(ncclTopoCheckP2p(comm, comm->topo, info1->rank, info2->rank, &p2p, read, intermediateRank));
int readEnable = ncclParamP2pReadEnable();
if (readEnable != -2) *read = readEnable;
return ncclSuccess;
}
static ncclResult_t p2pMap(struct ncclComm *comm, struct ncclProxyConnector* proxyConn, struct ncclPeerInfo* myInfo, struct ncclPeerInfo* peerInfo, struct ncclP2pBuff* p2pBuff, void** devMem, void** ipcPtr) {
if (P2P_SAME_PID(myInfo, peerInfo)) {
if (peerInfo->cudaDev != myInfo->cudaDev) {
// Same PID different GPUs, enable P2P access
// Legacy CUDA IPC
cudaError_t err = cudaDeviceEnablePeerAccess(peerInfo->cudaDev, 0);
if (err == cudaErrorPeerAccessAlreadyEnabled) {
cudaGetLastError();
} else if (err != cudaSuccess) {
WARN("failed to peer with device %d(=%lx): %d %s",
peerInfo->cudaDev, peerInfo->busId, err, cudaGetErrorString(err));
return ncclInternalError;
}
if (ncclCuMemEnable()) {
// for intra-process ranks, we should map memHandle of the peers to increase refcount.
// Otherwise, if peers abort and free the buffer, the rank can suffer invalid access.
NCCLCHECK(ncclCuMemAllocAddr(devMem, &p2pBuff->ipcDesc.memHandle, p2pBuff->size));
CUCHECK(cuMemRelease(p2pBuff->ipcDesc.memHandle));
*ipcPtr = *devMem;
} else {
*devMem = p2pBuff->directPtr;
*ipcPtr = NULL;
}
} else {
*devMem = p2pBuff->directPtr;
*ipcPtr = NULL;
}
} else {
// Different PID
NCCLCHECK(ncclP2pImportShareableBuffer(comm, peerInfo->rank, p2pBuff->size, &p2pBuff->ipcDesc, devMem));
*ipcPtr = *devMem;
}
return ncclSuccess;
}
/* Send: Create and return connect structures for this peer to connect to me */
ncclResult_t p2pSendSetup(struct ncclComm* comm, struct ncclTopoGraph* graph, struct ncclPeerInfo* myInfo, struct ncclPeerInfo* peerInfo,
struct ncclConnect* connectInfo, struct ncclConnector* send, int channelId, int connIndex) {
struct p2pResources* resources;
struct ncclP2pRequest req;
NCCLCHECK(ncclCalloc(&resources, 1));
send->transportResources = resources;
int useRead, intermediateRank;
NCCLCHECK(p2pGetInfo(comm, myInfo, peerInfo, &useRead, &intermediateRank));
if (useMemcpy) useRead = 0;
static_assert(sizeof(struct p2pConnectInfo) <= sizeof(struct ncclConnect), "p2p Connect Info is too big");
struct p2pConnectInfo* info = (struct p2pConnectInfo*)connectInfo;
info->read = useRead;
// For CollNet, use write for scatter-reduce (conn 1), read for broadcast-gather (conn 0)
if (graph && connIndex == 1) info->read = 0;
const char* useReadStr = info->read ? "/read" : "";
int sendSize = sizeof(struct ncclSendMem);
// For P2P Read the SIMPLE buffer is tagged on the end of the ncclSendMem structure
if (info->read) sendSize += comm->buffSizes[NCCL_PROTO_SIMPLE];
ALIGN_SIZE(sendSize, CUDA_IPC_MIN);
if (intermediateRank == -1) {
info->rank = myInfo->rank;
if (P2P_SAME_PID(myInfo, peerInfo) && ncclParamP2pDirectDisable() == 0 && useMemcpy == 0) {
resources->type = P2P_DIRECT;
INFO(NCCL_INIT|NCCL_P2P, "Channel %02d/%01d : %d[%d] -> %d[%d] via P2P/direct pointer%s",
channelId, connIndex, myInfo->rank, myInfo->nvmlDev, peerInfo->rank, peerInfo->nvmlDev, useReadStr);
} else {
// cuMem API support
if (ncclCuMemEnable()) {
resources->type = P2P_CUMEM;
const char *MNNVL = comm->MNNVL ? "MNNVL" : "CUMEM";
INFO(NCCL_INIT|NCCL_P2P,"Channel %02d/%01d : %d[%d] -> %d[%d] via P2P/%s%s%s",
channelId, connIndex, myInfo->rank, myInfo->nvmlDev, peerInfo->rank, peerInfo->nvmlDev, MNNVL, useReadStr, useMemcpy ? "/CE" : "");;
} else {
// Legacy CUDA IPC
resources->type = P2P_IPC;
INFO(NCCL_INIT|NCCL_P2P,"Channel %02d/%01d : %d[%d] -> %d[%d] via P2P/IPC%s%s",
channelId, connIndex, myInfo->rank, myInfo->nvmlDev, peerInfo->rank, peerInfo->nvmlDev, useReadStr, useMemcpy ? "/CE" : "");
}
}
send->conn.flags |= info->read ? NCCL_P2P_READ : NCCL_P2P_WRITE;
} else {
resources->type = P2P_INTERMEDIATE;
info->rank = intermediateRank;
INFO(NCCL_INIT|NCCL_P2P, "Channel %02d/%01d : %d[%d] -> %d[%d] via P2P/indirect/%d[%d]%s",
channelId, connIndex, myInfo->rank, myInfo->nvmlDev, peerInfo->rank, peerInfo->nvmlDev, intermediateRank,
comm->peerInfo[intermediateRank].nvmlDev, useReadStr);
}
req.size = sendSize;
req.refcount = 0;
if (P2P_SAME_PID((comm->peerInfo + info->rank), peerInfo) && (comm->peerInfo[info->rank].cudaDev != peerInfo->cudaDev)) req.refcount++;
if (P2P_SAME_PID((comm->peerInfo + info->rank), myInfo) && (comm->peerInfo[info->rank].cudaDev != myInfo->cudaDev)) req.refcount++;
NCCLCHECK(ncclProxyConnect(comm, TRANSPORT_P2P, 1, info->rank, &send->proxyConn));
if (useMemcpy) {
NCCLCHECK(ncclProxyCallBlocking(comm, &send->proxyConn, ncclProxyMsgSetup, NULL, 0, &resources->proxyInfo, sizeof(struct p2pShmProxyInfo)));
memcpy(&info->desc, &resources->proxyInfo.desc, sizeof(ncclShmIpcDesc_t));
} else {
NCCLCHECK(ncclProxyCallBlocking(comm, &send->proxyConn, ncclProxyMsgSetup, &req, sizeof(struct ncclP2pRequest), &info->p2pBuff, sizeof(struct ncclP2pBuff)));
NCCLCHECK(p2pMap(comm, &send->proxyConn, myInfo, comm->peerInfo+info->rank, &info->p2pBuff, (void**)&resources->sendDevMem, &resources->sendMemIpc));
resources->sendMemSameProc = P2P_SAME_PID(myInfo, (comm->peerInfo + info->rank));
}
return ncclSuccess;
}
/* Create and return connect structures for this peer to connect to me */
ncclResult_t p2pRecvSetup(struct ncclComm* comm, struct ncclTopoGraph* graph, struct ncclPeerInfo* myInfo, struct ncclPeerInfo* peerInfo,
struct ncclConnect* connectInfo, struct ncclConnector * recv, int channelId, int connIndex) {
struct p2pResources* resources;
struct ncclP2pRequest req;
NCCLCHECK(ncclCalloc(&resources, 1));
recv->transportResources = resources;
int useRead, intermediateRank;
NCCLCHECK(p2pGetInfo(comm, myInfo, peerInfo, &useRead, &intermediateRank));
static_assert(sizeof(struct p2pConnectInfo) <= sizeof(struct ncclConnect), "p2p Connect Info is too big");
struct p2pConnectInfo* info = (struct p2pConnectInfo*)connectInfo;
info->read = useRead;
// For CollNet, use write for scatter-reduce (conn 1), read for broadcast-gather (conn 0)
if (graph && connIndex == 1) info->read = 0;
int recvSize = sizeof(struct ncclRecvMem);
// For P2P Read the SIMPLE buffer is tagged on the end of the ncclSendMem structure
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) if (!(info->read && p == NCCL_PROTO_SIMPLE)) recvSize += comm->buffSizes[p];
ALIGN_SIZE(recvSize, CUDA_IPC_MIN);
if (intermediateRank == -1) {
info->rank = myInfo->rank;
if (P2P_SAME_PID(myInfo, peerInfo) && ncclParamP2pDirectDisable() == 0 && useMemcpy == 0) {
resources->type = P2P_DIRECT;
} else {
if (ncclCuMemEnable()) {
// cuMem API support
resources->type = P2P_CUMEM;
TRACE(NCCL_INIT|NCCL_P2P,"Ring %02d : %d[%d] <- %d[%d] via P2P/CUMEM",
channelId, myInfo->rank, myInfo->nvmlDev, peerInfo->rank, peerInfo->nvmlDev);
} else {
// Legacy CUDA IPC
resources->type = P2P_IPC;
}
}
recv->conn.flags |= info->read ? NCCL_P2P_READ : NCCL_P2P_WRITE;
} else {
resources->type = P2P_INTERMEDIATE;
info->rank = intermediateRank;
}
req.size = recvSize;
req.refcount = 0;
if (P2P_SAME_PID((comm->peerInfo + info->rank), peerInfo) && (comm->peerInfo[info->rank].cudaDev != peerInfo->cudaDev)) req.refcount++;
if (P2P_SAME_PID((comm->peerInfo + info->rank), myInfo) && (comm->peerInfo[info->rank].cudaDev != myInfo->cudaDev)) req.refcount++;
NCCLCHECK(ncclProxyConnect(comm, TRANSPORT_P2P, 0, info->rank, &recv->proxyConn));
NCCLCHECK(ncclProxyCallBlocking(comm, &recv->proxyConn, ncclProxyMsgSetup, &req, sizeof(struct ncclP2pRequest), &info->p2pBuff, sizeof(struct ncclP2pBuff)));
NCCLCHECK(p2pMap(comm, &recv->proxyConn, myInfo, comm->peerInfo+info->rank, &info->p2pBuff, (void**)&resources->recvDevMem, &resources->recvMemIpc));
resources->recvMemSameProc = P2P_SAME_PID(myInfo, (comm->peerInfo + info->rank));
return ncclSuccess;
}
/* Connect/Send to this peer */
static ncclResult_t p2pSendConnect(struct ncclComm* comm, struct ncclConnect* connectInfo, int nranks, int rank, struct ncclConnector* send) {
struct p2pResources* resources = (struct p2pResources*)send->transportResources;
struct ncclRecvMem* remDevMem = NULL;
struct p2pConnectInfo* info = (struct p2pConnectInfo*)connectInfo;
NCCLCHECK(p2pMap(comm, &send->proxyConn, comm->peerInfo+rank, comm->peerInfo+info->rank, &info->p2pBuff, (void**)&remDevMem, &resources->recvMemIpc));
resources->recvMemSameProc = P2P_SAME_PID((comm->peerInfo + rank), (comm->peerInfo + info->rank));
char* buff = (char*)(remDevMem+1);
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
if (info->read && p == NCCL_PROTO_SIMPLE) {
/* For P2P Read the SIMPLE buffer is local (ncclSendMem) */
if (resources->sendDevMem == NULL) return ncclInternalError; // We should not use read + memcpy
send->conn.buffs[p] = (char*)(resources->sendDevMem+1);
} else {
send->conn.buffs[p] = buff;
buff += comm->buffSizes[p];
}
}
send->conn.stepSize = comm->buffSizes[NCCL_PROTO_SIMPLE]/NCCL_STEPS;
if (useMemcpy) {
send->conn.tail = &resources->proxyInfo.ceRecvMem->tail;
send->conn.connFifo = resources->proxyInfo.ceRecvMem->connFifo;
send->conn.head = &resources->proxyInfo.devShm->sendMem.head;
// Send SIMPLE buff to proxy, and replace it by local buffer
NCCLCHECK(ncclProxyCallBlocking(comm, &send->proxyConn, ncclProxyMsgConnect, &send->conn.buffs[NCCL_PROTO_SIMPLE], sizeof(void*), NULL, 0));
send->conn.buffs[NCCL_PROTO_SIMPLE] = resources->proxyInfo.ceDevBuff;
} else {
send->conn.tail = &remDevMem->tail;
send->conn.head = &resources->sendDevMem->head;
send->conn.ptrExchange = &resources->sendDevMem->ptrExchange;
send->conn.redOpArgExchange = resources->sendDevMem->redOpArgExchange;
}
// We must assign the proxyConn's proxyProgress property for proper checking at enqueue-time
send->proxyConn.proxyProgress = p2pTransport.send.proxyProgress;
return ncclSuccess;
}
/* Connect/Recv from this peer */
ncclResult_t p2pRecvConnect(struct ncclComm* comm, struct ncclConnect* connectInfo, int nranks, int rank, struct ncclConnector* recv) {
struct p2pResources* resources = (struct p2pResources*)recv->transportResources;
struct p2pConnectInfo* info = (struct p2pConnectInfo*)connectInfo;
struct ncclSendMem* remDevMem = NULL;
if (useMemcpy) {
// Attach to peer's SHM segment
NCCLCHECK(ncclShmImportShareableBuffer(comm, &info->desc, (void**)&resources->shm, (void**)&resources->devShm, &resources->desc));
recv->conn.tail = &resources->devShm->recvMem.tail;
recv->conn.head = &resources->devShm->sendMem.head;
} else {
NCCLCHECK(p2pMap(comm, &recv->proxyConn, comm->peerInfo+rank, comm->peerInfo+info->rank, &info->p2pBuff, (void**)&remDevMem, &resources->sendMemIpc));
resources->sendMemSameProc = P2P_SAME_PID((comm->peerInfo + rank), (comm->peerInfo + info->rank));
struct ncclRecvMem* devMem = resources->recvDevMem;
recv->conn.tail = &devMem->tail;
recv->conn.head = &remDevMem->head;
recv->conn.ptrExchange = &remDevMem->ptrExchange;
recv->conn.redOpArgExchange = remDevMem->redOpArgExchange;
}
recv->conn.stepSize = comm->buffSizes[NCCL_PROTO_SIMPLE]/NCCL_STEPS;
char* buff = (char*)(resources->recvDevMem+1);
for (int p=0; p<NCCL_NUM_PROTOCOLS; p++) {
if (info->read && p == NCCL_PROTO_SIMPLE) {
if (remDevMem == NULL) return ncclInternalError; // We should not use read + memcpy
/* For P2P Read the SIMPLE buffer is remote (ncclSendMem) */
recv->conn.buffs[p] = (char*)(remDevMem+1);
} else {
recv->conn.buffs[p] = buff;
buff += comm->buffSizes[p];
}
}
return ncclSuccess;
}
ncclResult_t p2pSendFree(struct ncclConnector* send) {
struct p2pResources* resources = (struct p2pResources*)send->transportResources;
if (resources) {
if (ncclCuMemEnable()) {
// cuMem API support
if (resources->sendMemIpc) {
if (resources->sendMemSameProc) {
NCCLCHECK(ncclCuMemFreeAddr(resources->sendMemIpc));
} else {
NCCLCHECK(ncclCudaFree(resources->sendMemIpc));
}
}
if (resources->recvMemIpc) {
if (resources->recvMemSameProc) {
NCCLCHECK(ncclCuMemFreeAddr(resources->recvMemIpc));
} else {
NCCLCHECK(ncclCudaFree(resources->recvMemIpc));
}
}
}
else {
if (resources->sendMemIpc) CUDACHECK(cudaIpcCloseMemHandle(resources->sendMemIpc));
if (resources->recvMemIpc) CUDACHECK(cudaIpcCloseMemHandle(resources->recvMemIpc));
}
free(resources);
}
return ncclSuccess;
}
ncclResult_t p2pRecvFree(struct ncclConnector* recv) {
struct p2pResources* resources = (struct p2pResources*)recv->transportResources;
if (resources) {
if (ncclCuMemEnable()) {
// cuMem API support
if (resources->sendMemIpc) {
if (resources->sendMemSameProc) {
NCCLCHECK(ncclCuMemFreeAddr(resources->sendMemIpc));
} else {
NCCLCHECK(ncclCudaFree(resources->sendMemIpc));
}
}
if (resources->recvMemIpc) {
if (resources->recvMemSameProc) {
NCCLCHECK(ncclCuMemFreeAddr(resources->recvMemIpc));
} else {
NCCLCHECK(ncclCudaFree(resources->recvMemIpc));
}
}
}
else {
if (resources->sendMemIpc) CUDACHECK(cudaIpcCloseMemHandle(resources->sendMemIpc));
if (resources->recvMemIpc) CUDACHECK(cudaIpcCloseMemHandle(resources->recvMemIpc));
if (useMemcpy) {
NCCLCHECK(ncclShmIpcClose(&resources->desc));
}
}
free(resources);
}
return ncclSuccess;
}
static ncclResult_t p2pSendProxySetup(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState, void* reqBuff, int reqSize, void* respBuff, int respSize, int* done) {
if (useMemcpy) {
// CE memcpy support
struct p2pShmProxyInfo* proxyInfo;
size_t shmSize;
if (respSize != sizeof(struct p2pShmProxyInfo)) return ncclInternalError;
NCCLCHECK(ncclCalloc(&proxyInfo, 1));
connection->transportResources = proxyInfo;
NCCLCHECK(ncclCudaCalloc(&proxyInfo->ceDevBuff, proxyState->buffSizes[NCCL_PROTO_SIMPLE]));
// Create a SHM segment for the peer to attach to
shmSize = sizeof(struct ncclSendMem) + sizeof(struct ncclRecvMem);
NCCLCHECK(ncclShmAllocateShareableBuffer(proxyState->tpRank, shmSize, false, &proxyInfo->desc, (void**)&proxyInfo->shm, (void**)&proxyInfo->devShm));
NCCLCHECK(ncclCudaHostCalloc(&proxyInfo->ceRecvMem, 1));
memcpy(respBuff, proxyInfo, sizeof(struct p2pShmProxyInfo));
} else {
struct ncclP2pRequest* req = (struct ncclP2pRequest*)reqBuff;
if (reqSize != sizeof(struct ncclP2pRequest)) return ncclInternalError;
int size = req->size;
if (respSize != sizeof(struct ncclP2pBuff)) return ncclInternalError;
struct ncclP2pBuff* p2pBuff = (struct ncclP2pBuff*)respBuff;
NCCLCHECK(ncclP2pAllocateShareableBuffer(size, req->refcount, &p2pBuff->ipcDesc, &p2pBuff->directPtr));
p2pBuff->size = size;
if (ncclCuMemEnable()) {
// cuMem API support
struct p2pCuMemProxyInfo* proxyInfo;
NCCLCHECK(ncclCalloc(&proxyInfo, 1));
memcpy(&proxyInfo->p2pBuff, p2pBuff, sizeof(*p2pBuff));
connection->transportResources = proxyInfo;
} else {
connection->transportResources = p2pBuff->directPtr;
}
}
*done = 1;
return ncclSuccess;
}
static ncclResult_t p2pRecvProxySetup(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState, void* reqBuff, int reqSize, void* respBuff, int respSize, int* done) {
struct ncclP2pRequest* req = (struct ncclP2pRequest*)reqBuff;
if (reqSize != sizeof(struct ncclP2pRequest)) return ncclInternalError;
int size = req->size;
if (respSize != sizeof(struct ncclP2pBuff)) return ncclInternalError;
struct ncclP2pBuff* p2pBuff = (struct ncclP2pBuff*)respBuff;
NCCLCHECK(ncclP2pAllocateShareableBuffer(size, req->refcount, &p2pBuff->ipcDesc, &p2pBuff->directPtr));
p2pBuff->size = size;
if (ncclCuMemEnable()) {
// cuMem API support
struct p2pCuMemProxyInfo* proxyInfo;
NCCLCHECK(ncclCalloc(&proxyInfo, 1));
memcpy(&proxyInfo->p2pBuff, p2pBuff, sizeof(*p2pBuff));
connection->transportResources = proxyInfo;
} else {
connection->transportResources = p2pBuff->directPtr;
}
*done = 1;
return ncclSuccess;
}
static ncclResult_t p2pSendProxyConnect(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState, void* reqBuff, int reqSize, void* respBuff, int respSize, int* done) {
struct p2pShmProxyInfo* proxyInfo = (struct p2pShmProxyInfo*)connection->transportResources;
if (reqSize != sizeof(void*)) return ncclInternalError;
proxyInfo->recvFifo = *((char**)reqBuff);
CUDACHECK(cudaStreamCreateWithFlags(&proxyInfo->stream, cudaStreamNonBlocking));
for (int i=0; i<NCCL_STEPS; i++) {
CUDACHECK(cudaEventCreate(proxyInfo->events+i));
}
connection->proxyAppendPtr = &connection->proxyAppend;
return ncclSuccess;
}
static ncclResult_t p2pSendProxyFree(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState) {
// CE memcpy support
if (useMemcpy) {
struct p2pShmProxyInfo* proxyInfo = (struct p2pShmProxyInfo*)connection->transportResources;
if (proxyInfo) {
NCCLCHECK(ncclShmIpcClose(&proxyInfo->desc));
NCCLCHECK(ncclCudaHostFree(proxyInfo->ceRecvMem));
NCCLCHECK(ncclCudaFree(proxyInfo->ceDevBuff));
CUDACHECK(cudaStreamDestroy(proxyInfo->stream));
for (int i=0; i<NCCL_STEPS; i++) {
CUDACHECK(cudaEventDestroy(proxyInfo->events[i]));
}
free(proxyInfo);
}
} else {
if (ncclCuMemEnable()) {
// cuMem API support
struct p2pCuMemProxyInfo *proxyInfo = (struct p2pCuMemProxyInfo *) connection->transportResources;
if (proxyInfo) {
struct ncclP2pBuff *p2pBuff = &proxyInfo->p2pBuff;
ncclP2pFreeShareableBuffer(&p2pBuff->ipcDesc);
ncclCudaFree(p2pBuff->directPtr);
free(proxyInfo);
}
} else {
// Do not check return code as CUDA may have already shut down
ncclCudaFree(connection->transportResources);
}
}
return ncclSuccess;
}
static ncclResult_t p2pRecvProxyFree(struct ncclProxyConnection* connection, struct ncclProxyState* proxyState) {
if (ncclCuMemEnable()) {
struct p2pCuMemProxyInfo *proxyInfo = (struct p2pCuMemProxyInfo *) connection->transportResources;
if (proxyInfo) {
struct ncclP2pBuff *p2pBuff = &proxyInfo->p2pBuff;
ncclP2pFreeShareableBuffer(&p2pBuff->ipcDesc);
ncclCudaFree(p2pBuff->directPtr);
free(proxyInfo);
}
} else {
// Do not check return code as CUDA may have already shut down
ncclCudaFree(connection->transportResources);
}
return ncclSuccess;
}
// CE memcpy support
static ncclResult_t p2pSendProxyProgress(struct ncclProxyState* proxyState, struct ncclProxyArgs* args) {
if (args->state == ncclProxyOpReady) {
for (int s=0; s<args->nsubs; s++) {
struct ncclProxySubArgs* sub = args->subs+s;
struct p2pShmProxyInfo* resources = (struct p2pShmProxyInfo*) (sub->connection->transportResources);
// Round to next multiple of sliceSteps
sub->base = ROUNDUP(resources->step, args->chunkSteps);
sub->posted = sub->transmitted = sub->done = 0;
}
args->state = ncclProxyOpProgress;
}
args->idle = 1;
if (args->state == ncclProxyOpProgress) {
int p = args->protocol;
int stepSize = proxyState->buffSizes[p] / NCCL_STEPS;
for (int s=0; s<args->nsubs; s++) {
struct ncclProxySubArgs* sub = args->subs+s;
struct p2pShmProxyInfo* resources = (struct p2pShmProxyInfo*) (sub->connection->transportResources);
if (p != NCCL_PROTO_SIMPLE) { // Only Simple uses cudaMemcpy
resources->step = sub->base + sub->nsteps;
args->done++;
continue;
}
if (sub->transmitted < sub->done + NCCL_STEPS && sub->transmitted < sub->nsteps) {
int buffSlot = (sub->base+sub->transmitted)%NCCL_STEPS;
volatile struct ncclConnFifo* connFifo = resources->ceRecvMem->connFifo;
volatile uint64_t* recvTail = &resources->ceRecvMem->tail;
// Check GPU has sent everything
if ((*recvTail > sub->base+sub->transmitted)) {
int size = connFifo[buffSlot].size;
CUDACHECK(cudaMemcpyAsync(resources->recvFifo+buffSlot*stepSize, resources->ceDevBuff+buffSlot*stepSize, size, cudaMemcpyDeviceToDevice, 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 SHM
resources->shm->recvMem.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;
}
static ncclResult_t ipcRegisterBuffer(ncclComm* comm, const void* userbuff, size_t buffSize, int* peerRanks, int nPeers, ncclIpcRegType type, struct ncclReg* regRecord, int* regBufFlag, uintptr_t* offsetOut, uintptr_t** peerRmtAddrsOut, bool* isLegacyIpc) {
ncclResult_t ret = ncclSuccess;
struct ncclIpcRegInfo* newInfo = NULL;
uintptr_t* peerRmtAddrs = NULL;
bool legacyIpcCap = false;
size_t baseSize = 0;
void* baseAddr = NULL;
bool needUpdate = false;
*regBufFlag = 0;
*offsetOut = 0;
*peerRmtAddrsOut = NULL;
if (isLegacyIpc) *isLegacyIpc = false;
if (regRecord) {
// buffer was registered by by users, we need to start to register or reuse it
int peerLocalRank = -1;
for (int p = 0; p < nPeers; p++) {
int peerRank = peerRanks[p];
peerLocalRank = comm->rankToLocalRank[peerRank];
if (regRecord->ipcInfos[peerLocalRank]) {
// We already have IPC info for peerLocalRank, no need to register it, we can reuse it
*regBufFlag = 1;
if (isLegacyIpc) *isLegacyIpc = regRecord->ipcInfos[peerLocalRank]->impInfo.legacyIpcCap;
INFO(NCCL_REG, "rank %d - IPC reuse buffer %p size %ld (baseAddr %p size %ld) to peer %d regAddr %p", comm->rank, userbuff, buffSize, (void*)regRecord->addr, regRecord->pages * comm->regCache.pageSize, peerRank, regRecord->ipcInfos[peerLocalRank]->impInfo.rmtRegAddr);
} else {
// Register buffer with peerLocalRank
struct ncclProxyConnector* proxyConn = NULL;
struct p2pIpcExpInfo ipcInfo;
if (baseAddr == NULL) {
CUCHECKGOTO(cuMemGetAddressRange((CUdeviceptr*)&baseAddr, &baseSize, (CUdeviceptr)userbuff), ret, fail);
CUCHECKGOTO(cuPointerGetAttribute((void*)&legacyIpcCap, CU_POINTER_ATTRIBUTE_IS_LEGACY_CUDA_IPC_CAPABLE, (CUdeviceptr)baseAddr), ret, fail);
}
if (comm->gproxyConn[peerRank].initialized == false)
NCCLCHECKGOTO(ncclProxyConnect(comm, TRANSPORT_P2P, 1, peerRank, &comm->gproxyConn[peerRank]), ret, fail);
proxyConn = &comm->gproxyConn[peerRank];
// Get the mem handle for that buffer. It may have been allocated through cudaMalloc in which case we'll
// get the CUDA legacy mem handle, or through cuMem*.
if (ncclCuMemEnable()) {
CUmemGenericAllocationHandle handle;
if (CUPFN(cuMemRetainAllocationHandle(&handle, baseAddr)) != CUDA_SUCCESS) {
// if cuMem* export fails, retry legacy export
if (comm->directMode || !ncclParamLegacyCudaRegister()) goto fail;
CUDACHECKGOTO(cudaIpcGetMemHandle(&ipcInfo.ipcDesc.devIpc, baseAddr), ret, fail);
ipcInfo.legacyIpcCap = true;
if (isLegacyIpc) *isLegacyIpc = true;
} else {
ipcInfo.legacyIpcCap = false;
if (isLegacyIpc) *isLegacyIpc = false;
// cuMem* export to file descriptor or fabric handle
if (proxyConn->sameProcess) {
memcpy(&ipcInfo.ipcDesc.memHandle, &handle, sizeof(CUmemGenericAllocationHandle));
} else {
if (ncclCuMemHandleType == CU_MEM_HANDLE_TYPE_POSIX_FILE_DESCRIPTOR) {
int expFd = -1;
CUCHECKGOTO(cuMemExportToShareableHandle(&expFd, handle, ncclCuMemHandleType, 0), ret, fail);
NCCLCHECKGOTO(ncclProxyClientQueryFdBlocking(comm, proxyConn, expFd, &ipcInfo.impFd), ret, fail);
SYSCHECKGOTO(close(expFd), "close", ret, fail);
} else {
// Allow this to silently fail for cases where the user buff cannot be registered
if (CUPFN(cuMemExportToShareableHandle(&ipcInfo.ipcDesc.cuDesc.handle, handle, ncclCuMemHandleType, 0)) != CUDA_SUCCESS) {
CUCHECKGOTO(cuMemRelease(handle), ret, fail);
goto fail;
}
}
}
CUCHECKGOTO(cuMemRelease(handle), ret, fail);
}
} else if (legacyIpcCap) {
// legacy export
if (comm->directMode || !ncclParamLegacyCudaRegister()) goto fail;
CUDACHECKGOTO(cudaIpcGetMemHandle(&ipcInfo.ipcDesc.devIpc, baseAddr), ret, fail);
ipcInfo.legacyIpcCap = true;
if (isLegacyIpc) *isLegacyIpc = true;
} else {
// nothing works, just return
goto fail;
}
void* rmtRegAddr = NULL;
ipcInfo.size = baseSize;
ipcInfo.offset = regRecord->addr - (uintptr_t)baseAddr;
// Now ipcInfo contains all necessary registration info. Start to register buffer on proxy side
// and get the remote register address back.
if (proxyConn) {
INFO(NCCL_REG, "rank %d - IPC registering buffer %p size %ld (baseAddr %p size %ld) to peer %d", comm->rank, userbuff, buffSize, (void*)regRecord->addr, ipcInfo.size, peerRank);
NCCLCHECKGOTO(ncclProxyCallBlocking(comm, proxyConn, ncclProxyMsgRegister, &ipcInfo, sizeof(p2pIpcExpInfo), &rmtRegAddr, sizeof(void*)), ret, fail);
}
if (rmtRegAddr) {
NCCLCHECKGOTO(ncclCalloc(&newInfo, 1), ret, fail);
assert(regRecord->ipcInfos[peerLocalRank] == NULL);
regRecord->state |= IPC_REG_COMPLETE;
newInfo->peerRank = peerRank;
newInfo->baseAddr = baseAddr;
newInfo->impInfo.rmtRegAddr = rmtRegAddr;
newInfo->impInfo.offset = ipcInfo.offset;
newInfo->impInfo.legacyIpcCap = ipcInfo.legacyIpcCap;
newInfo->ipcProxyconn = proxyConn;
regRecord->ipcInfos[peerLocalRank] = newInfo;
if (regRecord->regIpcAddrs.hostPeerRmtAddrs == NULL) {
NCCLCHECKGOTO(ncclCalloc(®Record->regIpcAddrs.hostPeerRmtAddrs, comm->localRanks), ret, fail);
}
regRecord->regIpcAddrs.hostPeerRmtAddrs[peerLocalRank] = (uintptr_t)rmtRegAddr;
needUpdate = true;
*regBufFlag = 1;
INFO(NCCL_REG, "rank %d - IPC registered buffer %p size %ld (baseAddr %p size %ld) to peer %d regAddr %p offsetOut %ld", comm->rank, userbuff, buffSize, (void*)regRecord->addr, ipcInfo.size, peerRank, rmtRegAddr, (uintptr_t)userbuff - regRecord->addr);
}
}
}
if (*regBufFlag) {
if (type == NCCL_IPC_COLLECTIVE) {
// for collective, store registered remote buffers into dev memory for future reference
if (regRecord->regIpcAddrs.devPeerRmtAddrs == NULL || needUpdate) {
NCCLCHECKGOTO(ncclStrongStreamAcquireUncaptured(&comm->sharedRes->hostStream), ret, fail);
if (regRecord->regIpcAddrs.devPeerRmtAddrs == NULL)
NCCLCHECKGOTO(ncclCudaCallocAsync(®Record->regIpcAddrs.devPeerRmtAddrs, comm->localRanks, comm->sharedRes->hostStream.cudaStream), ret, fail);
if (needUpdate)
NCCLCHECKGOTO(ncclCudaMemcpyAsync(regRecord->regIpcAddrs.devPeerRmtAddrs, regRecord->regIpcAddrs.hostPeerRmtAddrs, comm->localRanks, comm->sharedRes->hostStream.cudaStream), ret, fail);
NCCLCHECKGOTO(ncclStrongStreamWaitStream(ncclCudaGraphNone(), &comm->sharedRes->deviceStream, &comm->sharedRes->hostStream), ret, fail);
NCCLCHECKGOTO(ncclStrongStreamRelease(ncclCudaGraphNone(), &comm->sharedRes->hostStream), ret, fail);
}
peerRmtAddrs = regRecord->regIpcAddrs.devPeerRmtAddrs;
} else {
assert(nPeers == 1);
// p2p always returns remote addr here since remote buffer addr is passed in ncclDevWorkP2p struct
peerRmtAddrs = (uintptr_t*)regRecord->regIpcAddrs.hostPeerRmtAddrs[peerLocalRank];
}
*offsetOut = (uintptr_t)userbuff - regRecord->addr;
*peerRmtAddrsOut = peerRmtAddrs;
}
}
exit:
return ret;
fail:
*regBufFlag = 0;
*offsetOut = 0;
*peerRmtAddrsOut = NULL;
if (newInfo) free(newInfo);
WARN("rank %d failed to IPC register userbuff %p buffSize %ld nPeers %d isLegacyIpc %p", comm->rank, userbuff, buffSize, nPeers, isLegacyIpc);
goto exit;
}
ncclResult_t ncclIpcLocalRegisterBuffer(ncclComm* comm, const void* userbuff, size_t buffSize, int* peerRanks, int nPeers, ncclIpcRegType type, int* regBufFlag, uintptr_t* offsetOut, uintptr_t** peerRmtAddrsOut) {
ncclResult_t ret = ncclSuccess;
struct ncclReg *regRecord = NULL;
bool isValid = false;
*regBufFlag = 0;
*offsetOut = 0;
*peerRmtAddrsOut = NULL;
if (comm && userbuff && buffSize > 0 && nPeers > 0) {
NCCLCHECKGOTO(ncclRegFind(comm, userbuff, buffSize, ®Record), ret, fail);
NCCLCHECKGOTO(ncclRegLocalIsValid(regRecord, &isValid), ret, fail);
if (isValid)
NCCLCHECKGOTO(ipcRegisterBuffer(comm, userbuff, buffSize, peerRanks, nPeers, type, regRecord, regBufFlag, offsetOut, peerRmtAddrsOut, NULL), ret, fail);
}
exit:
return ret;
fail:
*regBufFlag = 0;
*offsetOut = 0;
*peerRmtAddrsOut = NULL;
goto exit;
}
struct ncclIpcCleanupCallback {
struct ncclCommCallback base;
struct ncclComm *comm;
struct ncclReg *reg;
};
static ncclResult_t cleanupIpc(struct ncclComm* comm, struct ncclCommCallback* cb) {
struct ncclIpcCleanupCallback* obj = (struct ncclIpcCleanupCallback*)cb;
NCCLCHECK(ncclCommGraphDeregister(obj->comm, obj->reg));
free(obj);
return ncclSuccess;
}
ncclResult_t ncclIpcGraphRegisterBuffer(ncclComm* comm, const void* userbuff, size_t buffSize, int* peerRanks, int nPeers, ncclIpcRegType type, int* regBufFlag, uintptr_t* offsetOut, uintptr_t** peerRmtAddrsOut, void* cleanupQueuePtr, int* nCleanupQueueElts) {
ncclResult_t ret = ncclSuccess;
void* baseAddr;
size_t baseSize;
struct ncclIntruQueue<struct ncclCommCallback, &ncclCommCallback::next>* cleanupQueue = reinterpret_cast<struct ncclIntruQueue<struct ncclCommCallback, &ncclCommCallback::next>*>(cleanupQueuePtr);
bool isLegacyIpc = false;
struct ncclReg *regRecord = NULL;
*regBufFlag = 0;
*offsetOut = 0;
*peerRmtAddrsOut = NULL;
if (comm && userbuff && buffSize > 0 && nPeers > 0) {
CUCHECKGOTO(cuMemGetAddressRange((CUdeviceptr*)&baseAddr, &baseSize, (CUdeviceptr)userbuff), ret, fail);
NCCLCHECKGOTO(ncclCommGraphRegister(comm, baseAddr, baseSize, (void**)®Record), ret, fail);
NCCLCHECKGOTO(ipcRegisterBuffer(comm, userbuff, buffSize, peerRanks, nPeers, type, regRecord, regBufFlag, offsetOut, peerRmtAddrsOut, &isLegacyIpc), ret, fail);
if (*regBufFlag) {