From 45e77154cf5a46f789bb89aeb30c6de769a18bfb Mon Sep 17 00:00:00 2001
From: QI JUN <qijun1994@hotmail.com>
Date: Tue, 9 Jan 2018 20:24:09 +0800
Subject: [PATCH] add general memory usage interface for both CPU/CUDA (#7352)

---
 paddle/memory/memory.cc      | 16 ++++++++++++++++
 paddle/memory/memory.h       |  7 +++++++
 paddle/memory/memory_test.cc |  6 ++++++
 3 files changed, 29 insertions(+)

diff --git a/paddle/memory/memory.cc b/paddle/memory/memory.cc
index c4bb6baee7..1a73a94567 100644
--- a/paddle/memory/memory.cc
+++ b/paddle/memory/memory.cc
@@ -114,5 +114,21 @@ void Free<platform::CUDAPlace>(platform::CUDAPlace place, void* p) {
 
 #endif
 
+size_t Usage::operator()(const platform::CPUPlace& cpu) const {
+  return Used(cpu);
+}
+
+size_t Usage::operator()(const platform::CUDAPlace& gpu) const {
+#ifdef PADDLE_WITH_CUDA
+  return Used(gpu);
+#else
+  PADDLE_THROW("'CUDAPlace' is not supported in CPU only device.");
+#endif
+}
+
+size_t memory_usage(const platform::Place& p) {
+  return boost::apply_visitor(Usage(), p);
+}
+
 }  // namespace memory
 }  // namespace paddle
diff --git a/paddle/memory/memory.h b/paddle/memory/memory.h
index 11bbb88187..7012b6d331 100644
--- a/paddle/memory/memory.h
+++ b/paddle/memory/memory.h
@@ -54,6 +54,13 @@ void Free(Place place, void* ptr);
 template <typename Place>
 size_t Used(Place place);
 
+struct Usage : public boost::static_visitor<size_t> {
+  size_t operator()(const platform::CPUPlace& cpu) const;
+  size_t operator()(const platform::CUDAPlace& gpu) const;
+};
+
+size_t memory_usage(const platform::Place& p);
+
 /**
  * \brief   Free memory block in one place.
  *
diff --git a/paddle/memory/memory_test.cc b/paddle/memory/memory_test.cc
index f476bf7126..b3f699f9b7 100644
--- a/paddle/memory/memory_test.cc
+++ b/paddle/memory/memory_test.cc
@@ -44,6 +44,9 @@ TEST(BuddyAllocator, CPUAllocation) {
 
   EXPECT_NE(p, nullptr);
 
+  paddle::platform::Place place = cpu;
+  EXPECT_EQ(paddle::memory::Used(cpu), paddle::memory::memory_usage(place));
+
   paddle::memory::Free(cpu, p);
 }
 
@@ -99,6 +102,9 @@ TEST(BuddyAllocator, GPUAllocation) {
 
   EXPECT_NE(p, nullptr);
 
+  paddle::platform::Place place = gpu;
+  EXPECT_EQ(paddle::memory::Used(gpu), paddle::memory::memory_usage(place));
+
   paddle::memory::Free(gpu, p);
 }
 
-- 
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