ENH: add memory unit test

paddle/memory/CMakeLists.txt

 add_subdirectory(detail)
 
-cc_library(memory
-    SRCS
-    memory.cc)
+cc_library(memory SRCS memory.cc)
 
 cc_library(paddle_memory
     DEPS
     memory meta_data
     meta_cache memory_block
     buddy_allocator system_allocator)
+
+cc_test(memory_test SRCS memory_test.cc DEPS place paddle_memory)

paddle/memory/detail/CMakeLists.txt

 if(${WITH_GPU})
-  nv_library(system_allocator SRCS system_allocator.cc DEPS gflags gpu_info)
+  nv_library(system_allocator SRCS system_allocator.cc DEPS gflags cpu_info gpu_info)
 else(${WITH_GPU})
-  cc_library(system_allocator SRCS system_allocator.cc DEPS gflags)
+  cc_library(system_allocator SRCS system_allocator.cc DEPS gflags cpu_info)
 endif(${WITH_GPU})
 
 cc_test(system_allocator_test SRCS system_allocator_test.cc DEPS system_allocator)

paddle/memory/detail/buddy_allocator.cc

@@ -24,10 +24,20 @@ BuddyAllocator::BuddyAllocator(SystemAllocator* system_allocator,
     : min_chunk_size_(min_chunk_size),
       max_chunk_size_(max_chunk_size),
       cache_(system_allocator->UseGpu()),
-      system_allocator_(std::move(system_allocator)) {
-  PADDLE_ASSERT(min_chunk_size > 0);
-  PADDLE_ASSERT(max_chunk_size > 0);
-  PADDLE_ASSERT(system_allocator != nullptr);
+      system_allocator_(std::move(system_allocator)) {}
+
+BuddyAllocator::~BuddyAllocator() {
+  DLOG(INFO) << "BuddyAllocator Disconstructor makes sure that all of these "
+                "have actually been freed";
+  while (!pool_.empty()) {
+    auto block = static_cast<MemoryBlock*>(std::get<2>(*pool_.begin()));
+    DLOG(INFO) << "Free from block (" << block << ", " << max_chunk_size_
+               << ")";
+
+    system_allocator_->Free(block, max_chunk_size_, block->index(cache_));
+    cache_.invalidate(block);
+    pool_.erase(pool_.begin());
+  }
 }
 
 inline size_t align(size_t size, size_t alignment) {
@@ -62,7 +72,7 @@ void* BuddyAllocator::Alloc(size_t unaligned_size) {
       return nullptr;
     }
   } else {
-    DLOG(INFO) << " Allocation from existing memory block " << std::get<2>(*it)
+    DLOG(INFO) << "Allocation from existing memory block " << std::get<2>(*it)
                << " at address "
                << reinterpret_cast<MemoryBlock*>(std::get<2>(*it))->data();
   }
@@ -142,6 +152,8 @@ void BuddyAllocator::Free(void* p) {
   // TODO(gangliao): Clean up if existing too much free memory
 }
 
+size_t BuddyAllocator::Used() { return total_used_; }
+
 void* BuddyAllocator::SystemAlloc(size_t size) {
   size_t index = 0;
   void* p = system_allocator_->Alloc(index, size);
@@ -172,7 +184,7 @@ BuddyAllocator::PoolSet::iterator BuddyAllocator::RefillPool() {
 
   if (p == nullptr) return pool_.end();
 
-  DLOG(INFO) << " Creating and inserting new block " << p
+  DLOG(INFO) << "Creating and inserting new block " << p
              << " from system allocator";
 
   static_cast<MemoryBlock*>(p)->init(cache_, MemoryBlock::FREE_CHUNK, index,
@@ -211,20 +223,19 @@ void* BuddyAllocator::SplitToAlloc(BuddyAllocator::PoolSet::iterator it,
   auto block = static_cast<MemoryBlock*>(std::get<2>(*it));
   pool_.erase(it);
 
-  DLOG(INFO) << " Split block (" << block << ", " << block->total_size(cache_)
+  DLOG(INFO) << "Split block (" << block << ", " << block->total_size(cache_)
              << ") into";
   block->split(cache_, size);
 
-  DLOG(INFO) << " Left block (" << block << ", " << block->total_size(cache_)
+  DLOG(INFO) << "Left block (" << block << ", " << block->total_size(cache_)
              << ")";
   block->set_type(cache_, MemoryBlock::ARENA_CHUNK);
 
   // the rest of memory if exist
   if (block->has_right_buddy(cache_)) {
     if (block->right_buddy(cache_)->type(cache_) == MemoryBlock::FREE_CHUNK) {
-      DLOG(INFO) << " Insert right block (" << block->right_buddy(cache_)
-                 << ", " << block->right_buddy(cache_)->total_size(cache_)
-                 << ")";
+      DLOG(INFO) << "Insert right block (" << block->right_buddy(cache_) << ", "
+                 << block->right_buddy(cache_)->total_size(cache_) << ")";
 
       pool_.insert({block->right_buddy(cache_)->index(cache_),
                     block->right_buddy(cache_)->total_size(cache_),

paddle/memory/detail/buddy_allocator.h

@@ -93,33 +93,6 @@ class BuddyAllocator {
   std::mutex mutex_;
 };
 
-BuddyAllocator* GetCPUBuddyAllocator() {
-  static BuddyAllocator* a = nullptr;
-  if (a == nullptr) {
-    a = new BuddyAllocator(new CPUAllocator, platform::CpuMinChunkSize(),
-                           platform::CpuMaxChunkSize());
-  }
-  return a;
-}
-
-#ifndef PADDLE_ONLY_CPU  // The following code are for CUDA.
-
-BuddyAllocator* GetGPUBuddyAllocator(int gpu_id) {
-  static BuddyAllocator** as = NULL;
-  if (as == NULL) {
-    int gpu_num = platform::GpuDeviceCount();
-    as = new BuddyAllocator*[gpu_num];
-    for (int gpu = 0; gpu < gpu_num; gpu++) {
-      as[gpu] =
-          new BuddyAllocator(new GPUAllocator, platform::GpuMinChunkSize(),
-                             platform::GpuMaxChunkSize());
-    }
-  }
-  return as[gpu_id];
-}
-
-#endif  // PADDLE_ONLY_CPU
-
 }  // namespace detail
 }  // namespace memory
 }  // namespace paddle

paddle/memory/memory.cc

@@ -22,37 +22,67 @@ limitations under the License. */
 namespace paddle {
 namespace memory {
 
+detail::BuddyAllocator* GetCPUBuddyAllocator() {
+  static detail::BuddyAllocator* a = nullptr;
+  if (a == nullptr) {
+    a = new detail::BuddyAllocator(new detail::CPUAllocator,
+                                   platform::CpuMinChunkSize(),
+                                   platform::CpuMaxChunkSize());
+  }
+   return a;
+}
+
+#ifndef PADDLE_ONLY_CPU  // The following code are for CUDA.
+
+detail::BuddyAllocator* GetGPUBuddyAllocator(int gpu_id) {
+  static detail::BuddyAllocator** as = NULL;
+  if (as == NULL) {
+    int gpu_num = platform::GpuDeviceCount();
+    as = new detail::BuddyAllocator*[gpu_num];
+    for (int gpu = 0; gpu < gpu_num; gpu++) {
+      platform::SetDeviceId(gpu);
+      as[gpu] = new detail::BuddyAllocator(new detail::GPUAllocator,
+                                           platform::GpuMinChunkSize(),
+                                           platform::GpuMaxChunkSize());
+    }
+  }
+  return as[gpu_id];
+}
+
+#endif  // PADDLE_ONLY_CPU
+
 void* Alloc(platform::Place pl, size_t size) {
 #ifndef PADDLE_ONLY_CPU
   if (paddle::platform::is_gpu_place(pl)) {
     size_t gpu_id = boost::get<platform::GPUPlace>(pl).device;
-    return detail::GetGPUBuddyAllocator(gpu_id)->Alloc(size);
+    return GetGPUBuddyAllocator(gpu_id)->Alloc(size);
   }
 #endif  // PADDLE_ONLY_CPU
   PADDLE_ASSERT(paddle::platform::is_cpu_place(pl));
-  return detail::GetCPUBuddyAllocator()->Alloc(size);
+  return GetCPUBuddyAllocator()->Alloc(size);
 }
 
 void Free(paddle::platform::Place pl, void* p) {
 #ifndef PADDLE_ONLY_CPU
   if (paddle::platform::is_gpu_place(pl)) {
     size_t gpu_id = boost::get<platform::GPUPlace>(pl).device;
-    detail::GetGPUBuddyAllocator(gpu_id)->Free(p);
+    GetGPUBuddyAllocator(gpu_id)->Free(p);
+    return;
   }
 #endif  // PADDLE_ONLY_CPU
   PADDLE_ASSERT(paddle::platform::is_cpu_place(pl));
-  detail::GetCPUBuddyAllocator()->Free(p);
+  GetCPUBuddyAllocator()->Free(p);
 }
 
 size_t Used(paddle::platform::Place pl) {
 #ifndef PADDLE_ONLY_CPU
   if (paddle::platform::is_gpu_place(pl)) {
     size_t gpu_id = boost::get<platform::GPUPlace>(pl).device;
-    return detail::GetGPUBuddyAllocator(gpu_id)->Used();
+    return GetGPUBuddyAllocator(gpu_id)->Used();
   }
 #endif  // PADDLE_ONLY_CPU
   PADDLE_ASSERT(paddle::platform::is_cpu_place(pl));
-  return detail::GetCPUBuddyAllocator()->Used();
+  return GetCPUBuddyAllocator()->Used();
 }
 
 }  // namespace memory

paddle/memory/memory_test.cc

+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/memory/memory.h"
+#include "paddle/platform/place.h"
+
+#include "gtest/gtest.h"
+
+TEST(BuddyAllocator, CPUAllocation) {
+  void *p = nullptr;
+
+  EXPECT_EQ(p, nullptr);
+
+  paddle::platform::CPUPlace cpu;
+  p = paddle::memory::Alloc(cpu, 4096);
+
+  EXPECT_NE(p, nullptr);
+
+  paddle::memory::Free(cpu, p);
+}
+
+#ifndef PADDLE_ONLY_CPU
+
+TEST(BuddyAllocator, GPUAllocation) {
+  void *p = nullptr;
+
+  EXPECT_EQ(p, nullptr);
+
+  paddle::platform::GPUPlace gpu(0);
+  p = paddle::memory::Alloc(gpu, 4096);
+
+  EXPECT_NE(p, nullptr);
+
+  paddle::memory::Free(gpu, p);
+}
+
+#endif  // PADDLE_ONLY_CPU

paddle/platform/gpu_info.cc

@@ -56,7 +56,7 @@ size_t GpuMaxAllocSize() {
   GpuMemoryUsage(available, total);
 
   // Reserve the rest for page tables, etc.
-  return total * FLAGS_fraction_of_gpu_memory_to_use;
+  return static_cast<size_t>(total * FLAGS_fraction_of_gpu_memory_to_use);
 }
 
 size_t GpuMinChunkSize() {