1 files changed, 56 insertions, 0 deletions
diff --git a/src/channel.cc b/src/channel.cc
new file mode 100644
index 0000000..b053e5b
--- /dev/null
+++ b/src/channel.cc
@@ -0,0 +1,56 @@
+/*************************************************************************
+ * Copyright (c) 2015-2019, NVIDIA CORPORATION. All rights reserved.
+ *
+ * See LICENSE.txt for license information
+ ************************************************************************/
+
+#include "channel.h"
+#include "param.h"
+
+NCCL_PARAM(Buffsize, "BUFFSIZE", DEFAULT_BUFFER_SIZE_BYTES);
+
+ncclResult_t initChannel(struct ncclComm* comm, int channelid) {
+  struct ncclChannel* channel = comm->channels+channelid;
+  channel->id = channelid;
+
+  // Setup intermediate buffering
+  channel->buffSize = ncclParamBuffsize();
+
+  // Ring index to user rank table.
+  NCCLCHECK(ncclCudaCalloc(&channel->ring.devUserRanks, comm->nRanks));
+  NCCLCHECK(ncclCalloc(&channel->ring.userRanks, comm->nRanks));
+
+  // Communication structures with peers.
+  NCCLCHECK(ncclCudaCalloc(&channel->devPeers, comm->nRanks));
+  NCCLCHECK(ncclCalloc(&channel->peers, comm->nRanks));
+  for (size_t i=0; i<comm->nRanks; ++i) {
+    channel->peers[i].send.comm = comm;
+    channel->peers[i].recv.comm = comm;
+  }
+
+  // Per-channel operation list.
+  NCCLCHECK(ncclCudaHostAlloc((void**)&channel->collectives, (void**)&channel->devCollectives, sizeof(struct ncclColl)*NCCL_MAX_OPS));
+  return ncclSuccess;
+}
+
+ncclResult_t freeChannel(struct ncclChannel* channel, int nRanks) {
+  // Operation list
+  NCCLCHECK(ncclCudaHostFree(channel->collectives));
+
+  // Free Ring index to rank tables
+  free(channel->ring.userRanks);
+  CUDACHECK(cudaFree(channel->ring.devUserRanks));
+
+  // Free transport proxy resources
+  for (int r=0; r<nRanks; r++) {
+    struct ncclPeer* peer = channel->peers+r;
+    if (peer->send.transportResources) NCCLCHECK(peer->send.transportComm->free(peer->send.transportResources));
+    if (peer->recv.transportResources) NCCLCHECK(peer->recv.transportComm->free(peer->recv.transportResources));
+  }
+
+  // Free the peer structures.
+  CUDACHECK(cudaFree(channel->devPeers));
+  free(channel->peers);
+
+  return ncclSuccess;
+}