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#include <cstdint>
#include <iostream>
#include <memory>
#include <string>

#include "base/cpu_stats.h"
#include "base/init_mozc.h"
#include "base/port.h"
#include "base/thread.h"
#include "base/util.h"
#include "absl/flags/flag.h"
#include "absl/memory/memory.h"

ABSL_FLAG(int32_t, iterations, 1000, "number of iterations");
ABSL_FLAG(int32_t, polling_duration, 1000, "duration period in msec");
ABSL_FLAG(int32_t, dummy_threads_size, 0, "number of dummy threads");

namespace {
class DummyThread : public mozc::Thread {
 public:
  DummyThread() {}
  void Run() override {
    volatile uint64_t n = 0;
    while (true) {
      ++n;
      --n;
    }
  }

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

int main(int argc, char **argv) {
  mozc::InitMozc(argv[0], &argc, &argv);

  std::unique_ptr<DummyThread[]> threads;

  if (absl::GetFlag(FLAGS_dummy_threads_size) > 0) {
    threads = absl::make_unique<DummyThread[]>(
        absl::GetFlag(FLAGS_dummy_threads_size));
    for (int i = 0; i < absl::GetFlag(FLAGS_dummy_threads_size); ++i) {
      threads[i].Start("CpuStatsMain");
    }
  }

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

  return 0;
}
