Change Device::Sync to explicitly sync with all GPU streams

And not do a cuda context sync.

This helps when we have virtual GPUs -- with virtual GPUs doing a context
synchronize blocks on work on all virtual GPUs sharing the same physical GPU,
which we don't want.

PiperOrigin-RevId: 339053908
Change-Id: Ieae0cb48aa3c4dae3efc57775c30941b6bdcb3db

tensorflow/core/common_runtime/gpu/gpu_device.cc

@@ -601,11 +601,7 @@ void BaseGPUDevice::Compute(OpKernel* op_kernel, OpKernelContext* context) {
 
 // Based on the semantics of Device::Sync this call should wait for
 // all streams not just the current one.
-Status BaseGPUDevice::Sync() {
+Status BaseGPUDevice::Sync() { return GPUUtil::SyncAll(this); }
-  return tensorflow_gpu_device_info()
-      ->stream->parent()
-      ->BlockHostUntilAllStreamsAreDone();
-}
 
 void BaseGPUDevice::ComputeAsync(AsyncOpKernel* op_kernel,
                                  OpKernelContext* context,

tensorflow/stream_executor/stream_executor_pimpl.cc

@@ -768,7 +768,6 @@ bool StreamExecutor::AllocateStream(Stream *stream) {
     return false;
   }
 
-  RegisterStream(stream);
   return true;
 }
 
@@ -776,7 +775,6 @@ void StreamExecutor::DeallocateStream(Stream *stream) {
   implementation_->DeallocateStream(stream);
   CHECK_GE(live_stream_count_.fetch_sub(1), 0)
       << "live stream count should not dip below zero";
-  UnregisterStream(stream);
 }
 
 bool StreamExecutor::CreateStreamDependency(Stream *dependent, Stream *other) {

tensorflow/stream_executor/stream_executor_pimpl.h

@@ -528,24 +528,6 @@ class StreamExecutor {
   // allocation.
   StreamExecutorMemoryAllocator *GetAllocator() { return &allocator_; }
 
-  // Block host until all streams associated with this stream executor have
-  // finished all of enqueued work.
-  port::Status BlockHostUntilAllStreamsAreDone() {
-    std::vector<Stream *> streams;
-    {
-      absl::MutexLock lock(&mu_);
-      for (Stream *stream : streams_) {
-        streams.push_back(stream);
-      }
-    }
-
-    for (Stream *stream : streams) {
-      TF_RETURN_IF_ERROR(BlockHostUntilDone(stream));
-    }
-
-    return port::Status::OK();
-  }
-
  private:
   template <typename BeginCallT, typename CompleteCallT, typename ReturnT,
             typename... BeginArgsT>
@@ -675,16 +657,6 @@ class StreamExecutor {
   template <typename TraceCallT, typename... ArgsT>
   void SubmitTrace(TraceCallT trace_call, ArgsT &&...args);
 
-  void RegisterStream(Stream *stream) {
-    absl::MutexLock lock(&mu_);
-    streams_.insert(stream);
-  }
-
-  void UnregisterStream(Stream *stream) {
-    absl::MutexLock lock(&mu_);
-    streams_.erase(stream);
-  }
-
   // Reader/writer lock for class-static StreamExecutor members.
   static absl::Mutex static_mu_;
 
@@ -775,9 +747,6 @@ class StreamExecutor {
 
   StreamExecutorMemoryAllocator allocator_;
 
-  // Set of streams associated with this stream executor.
-  std::set<Stream *> streams_ TF_GUARDED_BY(mu_);
-
   SE_DISALLOW_COPY_AND_ASSIGN(StreamExecutor);
 };