void BM_tbb_mostly_idle()

in benchmarks/simple_pool_benchmark.cpp [94:127]

• 30 lines of code
• 3 McCabe index (conditional complexity)

void BM_tbb_mostly_idle(benchmark::State& state) {
  const int num_threads = state.range(0);
  const int num_elements = state.range(1);

  struct Recurse {
    void operator()() const {
      work[tid() & 1023] += i;
      if (i < num_elements) {
        ++i;
        g->run(*this);
      }
    }

    mutable int i;
    mutable Work* work;
    mutable tbb::task_group* g;
    int num_elements;
  };

  startRusage();

  for (auto UNUSED_VAR : state) {
    tbb::task_scheduler_init initsched(num_threads);
    tbb::task_group g;
    Recurse rec;
    rec.i = 0;
    rec.work = g_work;
    rec.g = &g;
    rec.num_elements = num_elements;
    rec();
    g.wait();
  }
  endRusage(state);
}