89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
// Copyright (c) 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/hash/sha1.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <algorithm>
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#include <string>
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#include <vector>
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#include "base/rand_util.h"
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#include "base/strings/string_number_conversions.h"
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#include "base/time/time.h"
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#include "testing/gtest/include/gtest/gtest.h"
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#include "testing/perf/perf_result_reporter.h"
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namespace {
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constexpr int kBytesPerMegabyte = 1000000;
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constexpr char kMetricPrefixSHA1[] = "SHA1.";
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constexpr char kMetricRuntime[] = "runtime";
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constexpr char kMetricThroughput[] = "throughput";
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// Histograms automatically calculate mean, min, max, and standard deviation,
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// but not median, so have a separate metric for our manually calculated median.
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constexpr char kMetricMedianThroughput[] = "median_throughput";
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perf_test::PerfResultReporter SetUpReporter(const std::string& story_name) {
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perf_test::PerfResultReporter reporter(kMetricPrefixSHA1, story_name);
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reporter.RegisterImportantMetric(kMetricRuntime, "us");
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reporter.RegisterImportantMetric(kMetricThroughput, "bytesPerSecond");
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reporter.RegisterImportantMetric(kMetricMedianThroughput, "bytesPerSecond");
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return reporter;
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}
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} // namespace
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static void Timing(const size_t len) {
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std::vector<uint8_t> buf(len);
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base::RandBytes(buf.data(), len);
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const int runs = 111;
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std::vector<base::TimeDelta> utime(runs);
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unsigned char digest[base::kSHA1Length];
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memset(digest, 0, base::kSHA1Length);
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double total_test_time = 0.0;
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for (int i = 0; i < runs; ++i) {
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auto start = base::TimeTicks::Now();
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base::SHA1HashBytes(buf.data(), len, digest);
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auto end = base::TimeTicks::Now();
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utime[i] = end - start;
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total_test_time += utime[i].InMicroseconds();
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}
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std::sort(utime.begin(), utime.end());
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const int med = runs / 2;
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// Simply dividing len by utime gets us MB/s, but we need B/s.
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// MB/s = (len / (bytes/megabytes)) / (usecs / usecs/sec)
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// MB/s = (len / 1,000,000)/(usecs / 1,000,000)
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// MB/s = (len * 1,000,000)/(usecs * 1,000,000)
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// MB/s = len/utime
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double median_rate = kBytesPerMegabyte * len / utime[med].InMicroseconds();
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// Convert to a comma-separated string so we can report every data point.
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std::string rates;
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for (const auto& t : utime) {
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rates +=
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base::NumberToString(kBytesPerMegabyte * len / t.InMicroseconds()) +
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",";
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}
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// Strip off trailing comma.
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rates.pop_back();
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auto reporter = SetUpReporter(base::NumberToString(len) + "_bytes");
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reporter.AddResult(kMetricRuntime, total_test_time);
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reporter.AddResult(kMetricMedianThroughput, median_rate);
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reporter.AddResultList(kMetricThroughput, rates);
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}
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TEST(SHA1PerfTest, Speed) {
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Timing(1024 * 1024U >> 1);
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Timing(1024 * 1024U >> 5);
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Timing(1024 * 1024U >> 6);
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Timing(1024 * 1024U >> 7);
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}
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