| /* Copyright 2015 The TensorFlow Authors. All Rights Reserved. |
| |
| 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 "tensorflow/core/common_runtime/gpu/gpu_id_manager.h" |
| |
| #include <unordered_map> |
| |
| #include "tensorflow/core/common_runtime/gpu/gpu_id.h" |
| #include "tensorflow/core/lib/core/errors.h" |
| #include "tensorflow/core/lib/core/status.h" |
| #include "tensorflow/core/platform/logging.h" |
| #include "tensorflow/core/platform/macros.h" |
| #include "tensorflow/core/platform/mutex.h" |
| |
| namespace tensorflow { |
| namespace { |
| // Manages the map between TfGpuId and CUDA GPU id. |
| class TfToCudaGpuIdMap { |
| public: |
| static TfToCudaGpuIdMap* singleton() { |
| static auto* id_map = new TfToCudaGpuIdMap; |
| return id_map; |
| } |
| |
| Status Insert(TfGpuId tf_gpu_id, CudaGpuId cuda_gpu_id) LOCKS_EXCLUDED(mu_) { |
| std::pair<IdMapType::iterator, bool> result; |
| { |
| mutex_lock lock(mu_); |
| result = id_map_.insert({tf_gpu_id.value(), cuda_gpu_id.value()}); |
| } |
| if (!result.second && cuda_gpu_id.value() != result.first->second) { |
| return errors::AlreadyExists( |
| "TensorFlow device (GPU:", tf_gpu_id.value(), |
| ") is being mapped to " |
| "multiple CUDA devices (", |
| cuda_gpu_id.value(), " now, and ", result.first->second, |
| " previously), which is not supported. " |
| "This may be the result of providing different GPU configurations " |
| "(ConfigProto.gpu_options, for example different visible_device_list)" |
| " when creating multiple Sessions in the same process. This is not " |
| " currently supported, see " |
| "https://github.com/tensorflow/tensorflow/issues/19083"); |
| } |
| return Status::OK(); |
| } |
| |
| bool Find(TfGpuId tf_gpu_id, CudaGpuId* cuda_gpu_id) const |
| LOCKS_EXCLUDED(mu_) { |
| mutex_lock lock(mu_); |
| auto result = id_map_.find(tf_gpu_id.value()); |
| if (result == id_map_.end()) return false; |
| *cuda_gpu_id = result->second; |
| return true; |
| } |
| |
| private: |
| TfToCudaGpuIdMap() = default; |
| |
| void TestOnlyReset() LOCKS_EXCLUDED(mu_) { |
| mutex_lock lock(mu_); |
| id_map_.clear(); |
| } |
| |
| using IdMapType = std::unordered_map<int32, int32>; |
| mutable mutex mu_; |
| IdMapType id_map_ GUARDED_BY(mu_); |
| |
| friend class ::tensorflow::GpuIdManager; |
| TF_DISALLOW_COPY_AND_ASSIGN(TfToCudaGpuIdMap); |
| }; |
| } // namespace |
| |
| Status GpuIdManager::InsertTfCudaGpuIdPair(TfGpuId tf_gpu_id, |
| CudaGpuId cuda_gpu_id) { |
| return TfToCudaGpuIdMap::singleton()->Insert(tf_gpu_id, cuda_gpu_id); |
| } |
| |
| Status GpuIdManager::TfToCudaGpuId(TfGpuId tf_gpu_id, CudaGpuId* cuda_gpu_id) { |
| if (TfToCudaGpuIdMap::singleton()->Find(tf_gpu_id, cuda_gpu_id)) { |
| return Status::OK(); |
| } |
| return errors::NotFound("TensorFlow device GPU:", tf_gpu_id.value(), |
| " was not registered"); |
| } |
| |
| void GpuIdManager::TestOnlyReset() { |
| TfToCudaGpuIdMap::singleton()->TestOnlyReset(); |
| } |
| |
| } // namespace tensorflow |