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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This program measures the time taken to decode the given JSON files (the
// command line arguments). It is for manual benchmarking.
//
// Usage:
// $ ninja -C out/foobar json_perftest_decodebench
// $ out/foobar/json_perftest_decodebench -a -n=10 the/path/to/your/*.json
//
// The -n=10 switch controls the number of iterations. It defaults to 1.
//
// The -a switch means to print 1 non-comment line per input file (the average
// iteration time). Without this switch (the default), it prints n non-comment
// lines per input file (individual iteration times). For a single input file,
// building and running this program before and after a particular commit can
// work well with the 'ministat' tool: https://github.com/thorduri/ministat
#include <inttypes.h>
#include <iomanip>
#include <iostream>
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/time/time.h"
int main(int argc, char* argv[]) {
if (!base::ThreadTicks::IsSupported()) {
std::cout << "# base::ThreadTicks is not supported\n";
return EXIT_FAILURE;
}
base::ThreadTicks::WaitUntilInitialized();
base::CommandLine::Init(argc, argv);
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
bool average = command_line->HasSwitch("a");
int iterations = 1;
std::string iterations_str = command_line->GetSwitchValueASCII("n");
if (!iterations_str.empty()) {
iterations = atoi(iterations_str.c_str());
if (iterations < 1) {
std::cout << "# invalid -n command line switch\n";
return EXIT_FAILURE;
}
}
if (average) {
std::cout << "# Microseconds (μs), n=" << iterations << ", averaged"
<< std::endl;
} else {
std::cout << "# Microseconds (μs), n=" << iterations << std::endl;
}
for (const auto& filename : command_line->GetArgs()) {
std::string src;
if (!base::ReadFileToString(base::FilePath(filename), &src)) {
std::cout << "# could not read " << filename << std::endl;
return EXIT_FAILURE;
}
int64_t total_time = 0;
std::string error_message;
for (int i = 0; i < iterations; ++i) {
auto start = base::ThreadTicks::Now();
auto v = base::JSONReader::ReadAndReturnValueWithError(src);
auto end = base::ThreadTicks::Now();
int64_t iteration_time = (end - start).InMicroseconds();
total_time += iteration_time;
if (i == 0) {
if (average) {
error_message =
!v.has_value() ? std::move(v.error().message) : std::string();
} else {
std::cout << "# " << filename;
if (!v.has_value() && !v.error().message.empty()) {
std::cout << ": " << v.error().message;
}
std::cout << std::endl;
}
}
if (!average) {
std::cout << iteration_time << std::endl;
}
}
if (average) {
int64_t average_time = total_time / iterations;
std::cout << std::setw(12) << average_time << "\t# " << filename;
if (!error_message.empty()) {
std::cout << ": " << error_message;
}
std::cout << std::endl;
}
}
return EXIT_SUCCESS;
}
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