From e53a48b46a143217a39b5f1c9125c4a7d507d2b5 Mon Sep 17 00:00:00 2001
From: liaogang <liaogang@baidu.com>
Date: Wed, 19 Jul 2017 22:27:41 +0800
Subject: [PATCH] Add memcpy

---
 paddle/memory/memory.cc | 46 +++++++++++++++++++++++++++++------------
 paddle/memory/memory.h  | 17 ++++++++++-----
 2 files changed, 45 insertions(+), 18 deletions(-)

diff --git a/paddle/memory/memory.cc b/paddle/memory/memory.cc
index 5be9bef3ac3..5c7b3bb15ea 100644
--- a/paddle/memory/memory.cc
+++ b/paddle/memory/memory.cc
@@ -15,9 +15,6 @@ limitations under the License. */
 #include "paddle/memory/memory.h"
 #include "paddle/memory/detail/buddy_allocator.h"
 #include "paddle/memory/detail/system_allocator.h"
-#include "paddle/platform/assert.h"
-
-#include <boost/variant.hpp>
 
 namespace paddle {
 namespace memory {
@@ -49,16 +46,9 @@ size_t Used<platform::CPUPlace>(platform::CPUPlace place) {
 
 template <>
 void Copy<platform::CPUPlace, platform::CPUPlace>(platform::CPUPlace, void* dst,
-                                                  platform::CPUPlace, void* src,
-                                                  size_t size) {
-  memcpy(dst, src, size);
-}
-
-template <>
-void Copy<platform::CPUPlace, platform::GPUPlace>(platform::CPUPlace, void* dst,
-                                                  platform::CPUPlace, void* src,
-                                                  size_t size) {
-  memcpy(dst, src, size);
+                                                  platform::CPUPlace,
+                                                  const void* src, size_t num) {
+  memcpy(dst, src, num);
 }
 
 #ifndef PADDLE_ONLY_CPU
@@ -93,6 +83,36 @@ size_t Used<platform::GPUPlace>(platform::GPUPlace place) {
   return GetGPUBuddyAllocator(place.device)->Used();
 }
 
+template <>
+void Copy<platform::CPUPlace, platform::GPUPlace>(platform::CPUPlace, void* dst,
+                                                  platform::GPUPlace,
+                                                  const void* src, size_t num,
+                                                  cudaStream_t stream) {
+  platform::GpuMemcpyAsync(dst, src, num, cudaMemcpyHostToDevice, stream);
+}
+
+template <>
+void Copy<platform::GPUPlace, platform::CPUPlace>(platform::GPUPlace, void* dst,
+                                                  platform::CPUPlace,
+                                                  const void* src, size_t num,
+                                                  cudaStream_t stream) {
+  platform::GpuMemcpyAsync(dst, src, num, cudaMemcpyDeviceToHost, stream);
+}
+
+template <>
+void Copy<platform::GPUPlace, platform::GPUPlace>(platform::GPUPlace dst_place,
+                                                  void* dst,
+                                                  platform::GPUPlace src_place,
+                                                  const void* src, size_t num,
+                                                  cudaStream_t stream) {
+  if (dst_place == src_place) {
+    platform::GpuMemcpyAsync(dst, src, num, cudaMemcpyDeviceToDevice, stream);
+  } else {
+    platform::GpuMemcpyPeer(dst, dst_place.device, src, src_place.device, num,
+                            stream);
+  }
+}
+
 #endif  // PADDLE_ONLY_CPU
 
 }  // namespace memory
diff --git a/paddle/memory/memory.h b/paddle/memory/memory.h
index 96c00cb106b..3ac359e1746 100644
--- a/paddle/memory/memory.h
+++ b/paddle/memory/memory.h
@@ -14,22 +14,29 @@ limitations under the License. */
 
 #pragma once
 
+#include "paddle/platform/gpu_info.h"
 #include "paddle/platform/place.h"
 
 namespace paddle {
 namespace memory {
 
-template <class Place>
+template <typename Place>
 void* Alloc(Place, size_t);
 
-template <class Place>
+template <typename Place>
 void Free(Place, void*);
 
-template <class Place>
+template <typename Place>
 size_t Used(Place);
 
-template <class Place1, class Place2>
-void Copy(Place1, void* dst, Place2, void* src, size_t size);
+template <typename DstPlace, typename SrcPlace>
+void Copy(DstPlace, void* dst, SrcPlace, const void* src, size_t num);
+
+#ifndef PADDLE_ONLY_CPU
+template <typename DstPlace, typename SrcPlace>
+void Copy(DstPlace, void* dst, SrcPlace, const void* src, size_t num,
+          cudaStream_t stream);
+#endif  // PADDLE_ONLY_CPU
 
 }  // namespace memory
 }  // namespace paddle
-- 
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