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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Tests manifest parser performance. Expects to be run in ninja's root
// directory.
#include <numeric>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
#include "getopt.h"
#include <direct.h>
#else
#include <getopt.h>
#include <unistd.h>
#endif
#include "disk_interface.h"
#include "graph.h"
#include "manifest_parser.h"
#include "metrics.h"
#include "state.h"
#include "util.h"
struct RealFileReader : public ManifestParser::FileReader {
virtual bool ReadFile(const string& path, string* content, string* err) {
return ::ReadFile(path, content, err) == 0;
}
};
bool WriteFakeManifests(const string& dir, string* err) {
RealDiskInterface disk_interface;
TimeStamp mtime = disk_interface.Stat(dir + "/build.ninja", err);
if (mtime != 0) // 0 means that the file doesn't exist yet.
return mtime != -1;
string command = "python misc/write_fake_manifests.py " + dir;
printf("Creating manifest data..."); fflush(stdout);
int exit_code = system(command.c_str());
printf("done.\n");
if (exit_code != 0)
*err = "Failed to run " + command;
return exit_code == 0;
}
int LoadManifests(bool measure_command_evaluation) {
string err;
RealFileReader file_reader;
State state;
ManifestParser parser(&state, &file_reader);
if (!parser.Load("build.ninja", &err)) {
fprintf(stderr, "Failed to read test data: %s\n", err.c_str());
exit(1);
}
// Doing an empty build involves reading the manifest and evaluating all
// commands required for the requested targets. So include command
// evaluation in the perftest by default.
int optimization_guard = 0;
if (measure_command_evaluation)
for (size_t i = 0; i < state.edges_.size(); ++i)
optimization_guard += state.edges_[i]->EvaluateCommand().size();
return optimization_guard;
}
int main(int argc, char* argv[]) {
bool measure_command_evaluation = true;
int opt;
while ((opt = getopt(argc, argv, const_cast<char*>("fh"))) != -1) {
switch (opt) {
case 'f':
measure_command_evaluation = false;
break;
case 'h':
default:
printf("usage: manifest_parser_perftest\n"
"\n"
"options:\n"
" -f only measure manifest load time, not command evaluation time\n"
);
return 1;
}
}
const char kManifestDir[] = "build/manifest_perftest";
string err;
if (!WriteFakeManifests(kManifestDir, &err)) {
fprintf(stderr, "Failed to write test data: %s\n", err.c_str());
return 1;
}
if (chdir(kManifestDir) < 0)
Fatal("chdir: %s", strerror(errno));
const int kNumRepetitions = 5;
vector<int> times;
for (int i = 0; i < kNumRepetitions; ++i) {
int64_t start = GetTimeMillis();
int optimization_guard = LoadManifests(measure_command_evaluation);
int delta = (int)(GetTimeMillis() - start);
printf("%dms (hash: %x)\n", delta, optimization_guard);
times.push_back(delta);
}
int min = *min_element(times.begin(), times.end());
int max = *max_element(times.begin(), times.end());
float total = accumulate(times.begin(), times.end(), 0.0f);
printf("min %dms max %dms avg %.1fms\n", min, max, total / times.size());
}
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