base/rand_util_perftest.cc

   1 // Copyright 2021 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/rand_util.h"
   6 #include "base/time/time.h"
   7 #include "testing/gtest/include/gtest/gtest.h"
   8 #include "testing/perf/perf_result_reporter.h"
   9
  10 namespace base {
  11
  12 namespace {
  13
  14 constexpr char kMetricPrefix[] = "RandUtil.";
  15 constexpr char kThroughput[] = "throughput";
  16
  17 }  // namespace
  18
  19 TEST(RandUtilPerfTest, RandUint64) {
  20   uint64_t inclusive_or = 0;
  21   constexpr int kIterations = 1e7;
  22
  23   auto before = base::TimeTicks::Now();
  24   for (int iter = 0; iter < kIterations; iter++) {
  25     inclusive_or |= base::RandUint64();
  26   }
  27   auto after = base::TimeTicks::Now();
  28
  29   perf_test::PerfResultReporter reporter(kMetricPrefix, "RandUint64");
  30   reporter.RegisterImportantMetric(kThroughput, "ns / iteration");
  31
  32   uint64_t nanos_per_iteration = (after - before).InNanoseconds() / kIterations;
  33   reporter.AddResult("throughput", static_cast<size_t>(nanos_per_iteration));
  34   ASSERT_NE(inclusive_or, static_cast<uint64_t>(0));
  35 }
  36
  37 TEST(RandUtilPerfTest, InsecureRandomRandUint64) {
  38   base::InsecureRandomGenerator gen;
  39   gen.Seed();
  40
  41   uint64_t inclusive_or = 0;
  42   constexpr int kIterations = 1e7;
  43
  44   auto before = base::TimeTicks::Now();
  45   for (int iter = 0; iter < kIterations; iter++) {
  46     inclusive_or |= gen.RandUint64();
  47   }
  48   auto after = base::TimeTicks::Now();
  49
  50   perf_test::PerfResultReporter reporter(kMetricPrefix,
  51                                          "InsecureRandomRandUint64");
  52   reporter.RegisterImportantMetric(kThroughput, "ns / iteration");
  53
  54   uint64_t nanos_per_iteration = (after - before).InNanoseconds() / kIterations;
  55   reporter.AddResult("throughput", static_cast<size_t>(nanos_per_iteration));
  56   ASSERT_NE(inclusive_or, static_cast<uint64_t>(0));
  57 }
  58
  59 }  // namespace base