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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/hash/hash.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <string>
#include <vector>
#include "base/containers/span.h"
#include "base/hash/sha1.h"
#include "base/rand_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/perf/perf_result_reporter.h"
namespace base {
namespace {
void Sha1Hash(base::span<const uint8_t> data) {
SHA1Hash(data);
}
void FastHash(base::span<const uint8_t> data) {
base::FastHash(data);
}
void RunTest(const char* hash_name,
void (*hash)(base::span<const uint8_t>),
const size_t len) {
constexpr char kMetricRuntime[] = "runtime";
constexpr char kMetricThroughput[] = "throughput";
// Histograms automatically calculate mean, min, max, and standard deviation,
// but not median, so have a separate metric for a manually calculated median.
constexpr char kMetricMedianThroughput[] = "median_throughput";
perf_test::PerfResultReporter reporter(hash_name,
NumberToString(len) + "_bytes");
reporter.RegisterImportantMetric(kMetricRuntime, "us");
reporter.RegisterImportantMetric(kMetricThroughput, "bytesPerSecond");
reporter.RegisterImportantMetric(kMetricMedianThroughput, "bytesPerSecond");
constexpr int kNumRuns = 111;
std::vector<TimeDelta> utime(kNumRuns);
TimeDelta total_test_time;
{
std::vector<uint8_t> buf(len);
RandBytes(buf);
for (int i = 0; i < kNumRuns; ++i) {
const auto start = TimeTicks::Now();
hash(buf);
utime[i] = TimeTicks::Now() - start;
total_test_time += utime[i];
}
std::ranges::sort(utime);
}
reporter.AddResult(kMetricRuntime, total_test_time.InMicrosecondsF());
// Simply dividing len by utime gets us MB/s, but we need B/s.
// MB/s = (len / (bytes/megabytes)) / (usecs / usecs/sec)
// MB/s = (len / 1,000,000)/(usecs / 1,000,000)
// MB/s = (len * 1,000,000)/(usecs * 1,000,000)
// MB/s = len/utime
constexpr int kBytesPerMegabyte = 1'000'000;
const auto rate = [len](TimeDelta t) {
return kBytesPerMegabyte * (len / t.InMicrosecondsF());
};
reporter.AddResult(kMetricMedianThroughput, rate(utime[kNumRuns / 2]));
// Convert to a comma-separated string so we can report every data point.
std::vector<std::string> rate_strings(utime.size());
std::ranges::transform(utime, rate_strings.begin(), [rate](const auto& t) {
return NumberToString(rate(t));
});
reporter.AddResultList(kMetricThroughput, JoinString(rate_strings, ","));
}
} // namespace
TEST(SHA1PerfTest, Speed) {
for (int shift : {1, 5, 6, 7}) {
RunTest("SHA1.", Sha1Hash, 1024 * 1024U >> shift);
}
}
TEST(HashPerfTest, Speed) {
for (int shift : {1, 5, 6, 7}) {
RunTest("FastHash.", FastHash, 1024 * 1024U >> shift);
}
}
} // namespace base
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