jinhongyii commented on code in PR #15742:
URL: https://github.com/apache/tvm/pull/15742#discussion_r1326594671
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src/runtime/disco/nccl/nccl.cc:
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@@ -91,26 +90,34 @@ void AllReduce(NDArray send, ReduceKind reduce_kind,
NDArray recv) {
NCCLThreadLocalContext* ctx = NCCLThreadLocalContext::Get();
ShapeTuple shape = send.Shape();
int64_t numel = shape->Product();
+ Device device = ctx->worker->default_device;
+ DeviceAPI::Get(device)->SyncStreamFromTo(device, nullptr, ctx->stream);
Review Comment:
makes sense
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