Wenkai Du
58 sor
2.0 KiB
C++
58 sor
2.0 KiB
C++
/*************************************************************************
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* Copyright (c) 2015-2019, NVIDIA CORPORATION. All rights reserved.
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* Modifications Copyright (c) 2019 Advanced Micro Devices, Inc. All rights reserved.
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*
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* See LICENSE.txt for license information
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************************************************************************/
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#include "channel.h"
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#include "param.h"
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NCCL_PARAM(Buffsize, "BUFFSIZE", DEFAULT_BUFFER_SIZE_BYTES);
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ncclResult_t initChannel(struct ncclComm* comm, int channelid) {
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struct ncclChannel* channel = comm->channels+channelid;
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channel->id = channelid;
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// Setup intermediate buffering
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channel->buffSize = ncclParamBuffsize();
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// Ring index to user rank table.
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NCCLCHECK(ncclCudaCalloc(&channel->ring.devUserRanks, comm->nRanks));
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NCCLCHECK(ncclCalloc(&channel->ring.userRanks, comm->nRanks));
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// Communication structures with peers.
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NCCLCHECK(ncclCudaCalloc(&channel->devPeers, comm->nRanks));
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NCCLCHECK(ncclCalloc(&channel->peers, comm->nRanks));
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for (size_t i=0; i<comm->nRanks; ++i) {
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channel->peers[i].send.comm = comm;
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channel->peers[i].recv.comm = comm;
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}
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// Per-channel operation list.
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NCCLCHECK(ncclCudaHostAlloc((void**)&channel->collectives, (void**)&channel->devCollectives, sizeof(struct ncclColl)*NCCL_MAX_OPS));
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return ncclSuccess;
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}
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ncclResult_t freeChannel(struct ncclChannel* channel, int nRanks) {
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// Operation list
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NCCLCHECK(ncclCudaHostFree(channel->collectives));
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// Free Ring index to rank tables
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free(channel->ring.userRanks);
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CUDACHECK(hipFree(channel->ring.devUserRanks));
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// Free transport proxy resources
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for (int r=0; r<nRanks; r++) {
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struct ncclPeer* peer = channel->peers+r;
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if (peer->send.transportResources) NCCLCHECK(peer->send.transportComm->free(peer->send.transportResources));
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if (peer->recv.transportResources) NCCLCHECK(peer->recv.transportComm->free(peer->recv.transportResources));
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}
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// Free the peer structures.
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CUDACHECK(hipFree(channel->devPeers));
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free(channel->peers);
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return ncclSuccess;
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}
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