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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Benchmark.h"
#include "CrashHandler.h"
#include "Stats.h"
#include "Timer.h"
#include "SkCanvas.h"
#include "SkCommandLineFlags.h"
#include "SkForceLinking.h"
#include "SkGraphics.h"
#include "SkString.h"
#include "SkSurface.h"
__SK_FORCE_IMAGE_DECODER_LINKING;
DEFINE_int32(samples, 10, "Number of samples to measure for each bench.");
DEFINE_int32(overheadLoops, 100000, "Loops to estimate timer overhead.");
DEFINE_double(overheadGoal, 0.0001,
"Loop until timer overhead is at most this fraction of our measurments.");
DEFINE_string(match, "", "The usual filters on file names of benchmarks to measure.");
DEFINE_bool2(quiet, q, false, "Print only bench name and minimum sample.");
DEFINE_bool2(verbose, v, false, "Print all samples.");
DEFINE_string(config, "8888 nonrendering",
"Configs to measure. Options: 565 8888 nonrendering");
// TODO: GPU benches
static SkString humanize(double ms) {
if (ms > 1e+3) return SkStringPrintf("%.3gs", ms/1e3);
if (ms < 1e-3) return SkStringPrintf("%.3gns", ms*1e6);
if (ms < 1) return SkStringPrintf("%.3gµs", ms*1e3);
return SkStringPrintf("%.3gms", ms);
}
static double estimate_timer_overhead() {
double overhead = 0;
WallTimer timer;
for (int i = 0; i < FLAGS_overheadLoops; i++) {
timer.start();
timer.end();
overhead += timer.fWall;
}
return overhead / FLAGS_overheadLoops;
}
static void safe_flush(SkCanvas* canvas) {
if (canvas) {
canvas->flush();
}
}
static int guess_loops(double overhead, Benchmark* bench, SkCanvas* canvas) {
WallTimer timer;
// Measure timer overhead and bench time together.
do {
timer.start();
bench->draw(1, canvas);
safe_flush(canvas);
timer.end();
} while (timer.fWall < overhead); // Shouldn't normally happen.
// Later we'll just start and stop the timer once, but loop N times.
// We'll pick N to make timer overhead negligible:
//
// Timer Overhead
// ------------------------------- < FLAGS_overheadGoal
// Timer Overhead + N * Bench Time
//
// where timer.fWall ≈ Timer Overhead + Bench Time.
//
// Doing some math, we get:
//
// (Timer Overhead / FLAGS_overheadGoal) - Timer Overhead
// ----------------------------------------------------- < N
// (timer.fWall - Timer Overhead)
//
// Luckily, this also works well in practice. :)
const double numer = overhead / FLAGS_overheadGoal - overhead;
const double denom = timer.fWall - overhead;
return (int)ceil(numer / denom);
}
static bool push_config_if_enabled(const char* config, SkTDArray<const char*>* configs) {
if (FLAGS_config.contains(config)) {
configs->push(config);
return true;
}
return false;
}
static void create_surfaces(Benchmark* bench,
SkTDArray<SkSurface*>* surfaces,
SkTDArray<const char*>* configs) {
if (bench->isSuitableFor(Benchmark::kNonRendering_Backend)
&& push_config_if_enabled("nonrendering", configs)) {
surfaces->push(NULL);
}
if (bench->isSuitableFor(Benchmark::kRaster_Backend)) {
const int w = bench->getSize().fX,
h = bench->getSize().fY;
if (push_config_if_enabled("8888", configs)) {
const SkImageInfo info = { w, h, kN32_SkColorType, kPremul_SkAlphaType };
surfaces->push(SkSurface::NewRaster(info));
}
if (push_config_if_enabled("565", configs)) {
const SkImageInfo info = { w, h, kRGB_565_SkColorType, kOpaque_SkAlphaType };
surfaces->push(SkSurface::NewRaster(info));
}
}
}
int tool_main(int argc, char** argv);
int tool_main(int argc, char** argv) {
SetupCrashHandler();
SkAutoGraphics ag;
SkCommandLineFlags::Parse(argc, argv);
const double overhead = estimate_timer_overhead();
if (FLAGS_verbose) {
// No header.
} else if (FLAGS_quiet) {
SkDebugf("min\tbench\tconfig\n");
} else {
SkDebugf("loops\tmin\tmean\tmax\tstddev\tbench\tconfig\n");
}
for (const BenchRegistry* r = BenchRegistry::Head(); r != NULL; r = r->next()) {
SkAutoTDelete<Benchmark> bench(r->factory()(NULL));
if (SkCommandLineFlags::ShouldSkip(FLAGS_match, bench->getName())) {
continue;
}
SkTDArray<SkSurface*> surfaces;
SkTDArray<const char*> configs;
create_surfaces(bench.get(), &surfaces, &configs);
bench->preDraw();
for (int j = 0; j < surfaces.count(); j++) {
SkCanvas* canvas = surfaces[j] ? surfaces[j]->getCanvas() : NULL;
const char* config = configs[j];
bench->draw(1, canvas); // Just paranoid warmup.
safe_flush(canvas);
const int loops = guess_loops(overhead, bench.get(), canvas);
SkAutoTMalloc<double> samples(FLAGS_samples);
WallTimer timer;
for (int i = 0; i < FLAGS_samples; i++) {
timer.start();
bench->draw(loops, canvas);
safe_flush(canvas);
timer.end();
samples[i] = timer.fWall / loops;
}
Stats stats(samples.get(), FLAGS_samples);
if (FLAGS_verbose) {
for (int i = 0; i < FLAGS_samples; i++) {
SkDebugf("%s ", humanize(samples[i]).c_str());
}
SkDebugf("%s\n", bench->getName());
} else if (FLAGS_quiet) {
if (configs.count() == 1) {
config = ""; // Only print the config if we run the same bench on more than one.
}
SkDebugf("%s\t%s\t%s\n", humanize(stats.min).c_str(), bench->getName(), config);
} else {
const double stddev_percent = 100 * sqrt(stats.var) / stats.mean;
SkDebugf("%d\t%s\t%s\t%s\t%.0f%%\t%s\t%s\n"
, loops
, humanize(stats.min).c_str()
, humanize(stats.mean).c_str()
, humanize(stats.max).c_str()
, stddev_percent
, bench->getName()
, config
);
}
}
surfaces.deleteAll();
}
return 0;
}
#if !defined SK_BUILD_FOR_IOS
int main(int argc, char * const argv[]) {
return tool_main(argc, (char**) argv);
}
#endif
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