grpc/test/cpp/qps/qps_interarrival_test.cc

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#include "test/cpp/qps/interarrival.h"
#include <chrono>
#include <iostream>

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

using grpc::testing::ExpDist;
using grpc::testing::InterarrivalTimer;

void RunTest(InterarrivalTimer&& timer, std::string title) {
  gpr_histogram *h(gpr_histogram_create(0.01,60e9));
  
  for (int i=0; i<10000000; i++) {
    for (int j=0; j<5; j++) {
      gpr_histogram_add(h, timer(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(InterarrivalTimer(ExpDist(10.0), 5), std::string("Exponential(10)"));
  RunTest(InterarrivalTimer(DetDist(5.0), 5), std::string("Det(5)"));
  RunTest(InterarrivalTimer(UniformDist(0.0,10.0), 5),
          std::string("Uniform(1,10)"));
  RunTest(InterarrivalTimer(ParetoDist(1.0,1.0), 5),
          std::string("Pareto(1,1)"));

  return 0;
}