src/base/cpu_stats_main.cc

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#include "base/cpu_stats.h"

#include <string>
#include <iostream>
#include "base/flags.h"
#include "base/thread.h"
#include "base/port.h"
#include "base/util.h"

DEFINE_int32(iterations, 1000, "number of iterations");
DEFINE_int32(polling_duration, 1000, "duration period in msec");
DEFINE_int32(dummy_threads_size, 0, "number of dummy threads");

namespace {
class DummyThread : public mozc::Thread {
 public:
  DummyThread() {}
  void Run() {
    volatile uint64 n = 0;
    while (true) {
      ++n;
      --n;
    }
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(DummyThread);
};
}  // namespace

int main(int argc, char **argv) {
  InitGoogle(argv[0], &argc, &argv, false);

  scoped_ptr<DummyThread[]> threads;

  if (FLAGS_dummy_threads_size > 0) {
    threads.reset(new DummyThread[FLAGS_dummy_threads_size]);
    for (int i = 0; i < FLAGS_dummy_threads_size; ++i) {
      threads[i].Start();
    }
  }

  mozc::CPUStats stats;
  cout << "NumberOfProcessors: "
       << stats.GetNumberOfProcessors() << endl;
  for (int i = 0; i < FLAGS_iterations; ++i) {
    cout << "CPUStats: "
         << stats.GetSystemCPULoad() << " "
         << stats.GetCurrentProcessCPULoad() << endl;
    mozc::Util::Sleep(FLAGS_polling_duration);
  }

  return 0;
}