From 3238ce06727d1daadfd5c93c12b7e9073f75e695 Mon Sep 17 00:00:00 2001
From: Yu Yang <yuyang18@baidu.com>
Date: Tue, 20 Mar 2018 12:47:01 +0800
Subject: [PATCH] Add wait

---
 paddle/fluid/framework/parallel_executor.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/paddle/fluid/framework/parallel_executor.cc b/paddle/fluid/framework/parallel_executor.cc
index 409cb3fbb91..6408ecdd376 100644
--- a/paddle/fluid/framework/parallel_executor.cc
+++ b/paddle/fluid/framework/parallel_executor.cc
@@ -813,6 +813,16 @@ void ParallelExecutor::Run(const std::vector<std::string> &fetch_tensors,
   fetch_ops.clear();
   *member_->global_scope_->Var(fetched_var_name)->GetMutable<LoDTensorArray>() =
       fetched_data->tensors_;
+  // FIXME:
+  // It could be optimized by using multiple events in an operator.
+  // Manually sync computation during iter.
+  for (auto &s : member_->communication_streams_) {
+    s.second.ctx_->Wait();
+  }
+
+  for (auto &p : member_->places_) {
+    platform::DeviceContextPool::Instance().Get(p)->Wait();
+  }
 }
 
 void ParallelExecutor::RunOp(
-- 
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