szha commented on a change in pull request #20331:
URL: https://github.com/apache/incubator-mxnet/pull/20331#discussion_r664135001
##########
File path: src/engine/threaded_engine.cc
##########
@@ -523,5 +543,206 @@ void ThreadedEngine::OnCompleteStatic(Engine *engine,
void *opr_block_,
OprBlock::Delete(opr_block);
}
+void ThreadedEngine::OnStartStatic(Engine *engine, void *opr_block,
+ const dmlc::Error* error) {
+ // no-op
+}
+
+#if MXNET_USE_CUDA
+static inline void AddEventHelper(
+ std::unordered_map<cudaStream_t, EventInfo>* events_per_stream,
+ const EventInfo& cuda_event) {
+ auto event_stream = cuda_event.stream;
+ if (events_per_stream->count(event_stream) > 0) {
+ if ((*events_per_stream)[event_stream].pool_index < cuda_event.pool_index)
{
+ (*events_per_stream)[event_stream] = cuda_event;
+ }
+ } else {
+ (*events_per_stream).emplace(event_stream, cuda_event);
+ }
+}
+
+void ThreadedEngine::OnStartCPU(Engine *engine, void *opr_block,
+ const dmlc::Error* error) {
+ static bool use_new_dep_engine = dmlc::GetEnv("MXNET_ASYNC_GPU_ENGINE",
false);
Review comment:
We already have `MXNET_ENGINE_TYPE` which decides whether `NaiveEngine`
(i.e. synchronous scheduler) is used, so unless there's a strong reason I'd
prefer not to introduce new environment variables here.
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