grpc/test/cpp/qps/qps_interarrival_test.cc

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#include <chrono>
#include <iostream>

// Use the C histogram rather than C++ to avoid depending on proto
#include <grpc/support/histogram.h>

#include "test/cpp/qps/interarrival.h"

using grpc::testing::RandomDistInterface;
using grpc::testing::InterarrivalTimer;

static void RunTest(RandomDistInterface &&r, int threads, std::string title) {
  InterarrivalTimer timer;
  timer.init(r, threads);
  gpr_histogram *h(gpr_histogram_create(0.01, 60e9));

  for (int i = 0; i < 10000000; i++) {
    for (int j = 0; j < threads; j++) {
      gpr_histogram_add(h, timer.next(j).count());
    }
  }

  std::cout << title << " Distribution" << std::endl;
  std::cout << "Value, Percentile" << std::endl;
  for (double pct = 0.0; pct < 100.0; pct += 1.0) {
    std::cout << gpr_histogram_percentile(h, pct) << "," << pct << std::endl;
  }

  gpr_histogram_destroy(h);
}

using grpc::testing::ExpDist;
using grpc::testing::DetDist;
using grpc::testing::UniformDist;
using grpc::testing::ParetoDist;

int main(int argc, char **argv) {
  RunTest(ExpDist(10.0), 5, std::string("Exponential(10)"));
  RunTest(DetDist(5.0), 5, std::string("Det(5)"));
  RunTest(UniformDist(0.0, 10.0), 5, std::string("Uniform(0,10)"));
  RunTest(ParetoDist(1.0, 1.0), 5, std::string("Pareto(1,1)"));
  return 0;
}