ThreadLocal.cpp 1.9 KB
Newer Older
1
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
2 3 4 5 6 7 8 9 10 11 12 13 14 15

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 "ThreadLocal.h"
16 17 18

#include <gflags/gflags.h>

Y
Yu Yang 已提交
19
#include "Util.h"
20

21 22 23
DEFINE_bool(thread_local_rand_use_global_seed,
            false,
            "Whether to use global seed in thread local rand.");
24 25 26 27 28 29 30 31 32 33 34

namespace paddle {

unsigned int ThreadLocalRand::defaultSeed_ = 1;
ThreadLocal<unsigned int> ThreadLocalRand::seed_;

unsigned int* ThreadLocalRand::getSeed() {
  unsigned int* p = seed_.get(false /*createLocal*/);
  if (!p) {  // init seed
    if (FLAGS_thread_local_rand_use_global_seed) {
      p = new unsigned int(defaultSeed_);
L
liaogang 已提交
35
    } else if (getpid() == getTID()) {  // main thread
36 37 38
      // deterministic, but differs from global srand()
      p = new unsigned int(defaultSeed_ - 1);
    } else {
L
liaogang 已提交
39
      p = new unsigned int(defaultSeed_ + getTID());
L
Luo Tao 已提交
40
      VLOG(3) << "thread use undeterministic rand seed:" << *p;
41 42 43 44 45 46 47 48 49 50 51 52 53 54
    }
    seed_.set(p);
  }
  return p;
}

ThreadLocal<std::default_random_engine> ThreadLocalRandomEngine::engine_;
std::default_random_engine& ThreadLocalRandomEngine::get() {
  auto engine = engine_.get(false);
  if (!engine) {
    engine = new std::default_random_engine;
    int defaultSeed = ThreadLocalRand::getDefaultSeed();
    engine->seed(FLAGS_thread_local_rand_use_global_seed
                     ? defaultSeed
L
liaogang 已提交
55
                     : defaultSeed + getTID());
56 57 58 59 60 61
    engine_.set(engine);
  }
  return *engine;
}

}  // namespace paddle
反馈
建议
客服 返回
顶部