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2.8.3-1

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Optimization for Tree allreduce on A100.
Improve aggregation performance.
Use shared buffers for inter-node send/recv.
Add NVTX profiling hooks.
Accelerate alltoall connections by merging communication for all
channels.
Add support for one hop communication through NVLink, for faster
send/recv communication on cubemesh topologies like DGX-1.
Improve alltoall scheduling to better balance intra/inter node
communication.
Increase send/recv parallelism by 8x, each warp sending or
receiving to a different peer.
Net: move to v4.
Net: make flush operation asynchronous to accelerate alltoall.
Net: define maximum number of requests.
Fix hang when using LL128 protocol after 2^31 steps.
Fix #379 : topology injection failing when using less GPUs than
described in the XML.
Fix #394 : protocol mismatch causing hangs or crashes when using
one GPU per node.
This commit is contained in:
Sylvain Jeaugey
2020-09-04 14:35:05 -07:00
parent 084207e685
commit 920dbe5b35
90 changed files with 11172 additions and 3209 deletions
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src/debug.cc
+3 -3
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@@ -127,7 +127,7 @@ void ncclDebugInit() {
void ncclDebugLog(ncclDebugLogLevel level, unsigned long flags, const char *filefunc, int line, const char *fmt, ...) {
if (ncclDebugLevel == -1) ncclDebugInit();
if (ncclDebugNoWarn != 0 && level == NCCL_LOG_WARN) { level = NCCL_LOG_INFO; flags = ncclDebugNoWarn; }
if (ncclDebugLevel < level) return;
if (ncclDebugLevel < level || ((flags & ncclDebugMask) == 0)) return;
// Gather the rank information. This can take > 1us so we want to make sure
// we only do it when needed.
@@ -144,11 +144,11 @@ void ncclDebugLog(ncclDebugLogLevel level, unsigned long flags, const char *file
if (level == NCCL_LOG_WARN)
len = snprintf(buffer, sizeof(buffer),
"\n%s:%d:%d [%d] %s:%d NCCL WARN ", hostname, pid, tid, cudaDev, filefunc, line);
else if (level == NCCL_LOG_INFO && (flags & ncclDebugMask))
else if (level == NCCL_LOG_INFO)
len = snprintf(buffer, sizeof(buffer),
"%s:%d:%d [%d] NCCL INFO ", hostname, pid, tid, cudaDev);
#ifdef ENABLE_TRACE
else if (level == NCCL_LOG_TRACE && (flags & ncclDebugMask)) {
else if (level == NCCL_LOG_TRACE) {
auto delta = std::chrono::high_resolution_clock::now() - ncclEpoch;
double timestamp = std::chrono::duration_cast<std::chrono::duration<double>>(delta).count()*1000;
len = snprintf(buffer, sizeof(buffer),