1 /* Copyright 2020 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 #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_GPU_NCCL_TEST_UTILS_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_GPU_NCCL_TEST_UTILS_H_ 18 19 #include "absl/container/flat_hash_set.h" 20 #include "tensorflow/compiler/xla/service/global_device_id.h" 21 22 namespace xla { 23 namespace gpu { 24 25 // Gets the set of devices that have a NCCL channel open. This is primarily 26 // for testing. 27 // 28 // (Indeed, because the NCCL channels are a global variable, in the real 29 // world, the value returned here is stale as soon as you read it, so it's not 30 // clear how you *could* use it for anything other than tests.) 31 absl::flat_hash_set<GlobalDeviceId> DevicesWithOpenNcclChannels(); 32 33 } // namespace gpu 34 } // namespace xla 35 36 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_GPU_NCCL_TEST_UTILS_H_ 37