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[fleet_executor] Fix overlap hang #38024

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Dec 10, 2021
Merged

[fleet_executor] Fix overlap hang #38024

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90e6af5
fix overlap hang
FeixLiu Dec 9, 2021
76a5b09
add annotation
FeixLiu Dec 9, 2021
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5 changes: 5 additions & 0 deletions paddle/fluid/distributed/fleet_executor/carrier.h
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,11 @@ class Carrier final {

bool IsInit() const;

// NOTE: This mutex will be used in interceptor's RunOps function.
// This mutex is used for avoiding forward ops and backward ops run
// simultaneously, which will lead to a random hang for some sync ops.
std::mutex run;

DISABLE_COPY_AND_ASSIGN(Carrier);

private:
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3 changes: 3 additions & 0 deletions paddle/fluid/distributed/fleet_executor/compute_interceptor.cc
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Expand Up @@ -13,6 +13,7 @@
// limitations under the License.

#include "paddle/fluid/distributed/fleet_executor/compute_interceptor.h"
#include "paddle/fluid/distributed/fleet_executor/carrier.h"

#include "paddle/fluid/distributed/fleet_executor/task_node.h"
#include "paddle/fluid/framework/executor_gc_helper.h"
Expand Down Expand Up @@ -169,6 +170,8 @@ void ComputeInterceptor::ReplyCompletedToUpStream() {
}

void ComputeInterceptor::RunOps() {
Carrier& carrier_instance = Carrier::Instance();
std::unique_lock<std::mutex> lock(carrier_instance.run);
VLOG(3) << "ComputeInterceptor " << interceptor_id_ << " running ops for the "
<< step_ + 1 << " time.";
for (auto op : node_->ops()) {
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