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temporarily fix the performance drop of recurrent op #36052

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Sep 25, 2021
Merged

temporarily fix the performance drop of recurrent op #36052

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11 changes: 5 additions & 6 deletions paddle/fluid/operators/recurrent_op.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -215,13 +215,7 @@ void RecurrentOp::RunImpl(const framework::Scope &scope,
kSkipEagerDeletionVars), /*skip_ref_cnt_vars*/
true);

static std::mutex mutex;
std::lock_guard<std::mutex> lock(mutex);
StepScopes scopes = CreateStepScopes(dev_ctx, scope, seq_len);
// TODO(gfwm2013) Function CreateStepScopes would make segmentation fault in
// multithreading in eval process, so we use a mutex before function
// CreateStepScopes to make sure that the computing process is correct. This
// problem will fix in next pull request.
for (size_t i = 0; i < seq_len; ++i) {
size_t seq_offset = reverse ? seq_len - i - 1 : i;
VLOG(3) << "Recurrent operate at the time step " << seq_offset;
Expand Down Expand Up @@ -292,6 +286,11 @@ void RecurrentOp::RunImpl(const framework::Scope &scope,
StepScopes RecurrentOp::CreateStepScopes(const platform::DeviceContext &dev_ctx,
const framework::Scope &scope,
size_t seq_len) const {
static std::mutex mutex;
std::lock_guard<std::mutex> lock(mutex);
// TODO(baoachun) Function CreateStepScopes may lead to segmentation
// fault in multithreading in eval process. The performance drop of
// adding mutex need to be fixed.
auto *var = scope.FindVar(Output(kStepScopes));
PADDLE_ENFORCE_NOT_NULL(var, platform::errors::InvalidArgument(
"RecurrentOp gets empty StepScopes var"));
Expand Down