From 345737d0fe0339831e79cadad9df47f1b398fea0 Mon Sep 17 00:00:00 2001
From: chengduoZH <zhaochengduo@163.com>
Date: Tue, 8 May 2018 13:37:31 +0800
Subject: [PATCH] add sync

---
 paddle/fluid/platform/cuda_device_function.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/paddle/fluid/platform/cuda_device_function.h b/paddle/fluid/platform/cuda_device_function.h
index e81c385727b..ecec4178f2d 100644
--- a/paddle/fluid/platform/cuda_device_function.h
+++ b/paddle/fluid/platform/cuda_device_function.h
@@ -63,6 +63,7 @@ __device__ T reduceSum(T val, int tid, int len) {
     val += platform::CudaShuffleDownSync(mask, val, offset);
 
   if (tid < warpSize) shm[tid] = 0;
+  __syncthreads();
 
   if (tid % warpSize == 0) {
     shm[tid / warpSize] = val;
-- 
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