1 /* Copyright 2016 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 16 // Declares the "host" platform, which is a CPU-only implementation of the 17 // StreamExecutor. The host platform only supports memory operations and plugin 18 // routines, and is primarily used for testing. 19 #ifndef TENSORFLOW_STREAM_EXECUTOR_HOST_HOST_PLATFORM_H_ 20 #define TENSORFLOW_STREAM_EXECUTOR_HOST_HOST_PLATFORM_H_ 21 22 #include <memory> 23 #include <string> 24 #include <vector> 25 26 #include "tensorflow/core/platform/thread_annotations.h" 27 #include "tensorflow/stream_executor/executor_cache.h" 28 #include "tensorflow/stream_executor/lib/statusor.h" 29 #include "tensorflow/stream_executor/multi_platform_manager.h" 30 #include "tensorflow/stream_executor/platform.h" 31 #include "tensorflow/stream_executor/platform/port.h" 32 #include "tensorflow/stream_executor/stream_executor_pimpl.h" 33 #include "tensorflow/stream_executor/trace_listener.h" 34 35 namespace stream_executor { 36 namespace host { 37 38 // Host (CPU) platform plugin, registered as a singleton value via module 39 // initializer. 40 class HostPlatform : public Platform { 41 public: 42 HostPlatform(); 43 ~HostPlatform() override; 44 45 Platform::Id id() const override; 46 47 // Device count is less clear-cut for CPUs than accelerators. This call 48 // currently returns the number of thread units in the host, as reported by 49 // base::NumCPUs(). 50 int VisibleDeviceCount() const override; 51 52 const std::string& Name() const override; 53 54 port::StatusOr<std::unique_ptr<DeviceDescription>> DescriptionForDevice( 55 int ordinal) const override; 56 57 port::StatusOr<StreamExecutor*> ExecutorForDevice(int ordinal) override; 58 59 port::StatusOr<StreamExecutor*> ExecutorForDeviceWithPluginConfig( 60 int ordinal, const PluginConfig& config) override; 61 62 port::StatusOr<StreamExecutor*> GetExecutor( 63 const StreamExecutorConfig& config) override; 64 65 port::StatusOr<std::unique_ptr<StreamExecutor>> GetUncachedExecutor( 66 const StreamExecutorConfig& config) override; 67 68 void RegisterTraceListener(std::unique_ptr<TraceListener> listener) override; 69 70 void UnregisterTraceListener(TraceListener* listener) override; 71 72 private: 73 // This platform's name. 74 std::string name_; 75 76 // Cache of created StreamExecutors. 77 ExecutorCache executor_cache_; 78 79 SE_DISALLOW_COPY_AND_ASSIGN(HostPlatform); 80 }; 81 82 } // namespace host 83 } // namespace stream_executor 84 85 #endif // TENSORFLOW_STREAM_EXECUTOR_HOST_HOST_PLATFORM_H_ 86