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skia2/bench/nanobench.cpp

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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 <ctype.h>
#include "Benchmark.h"
#include "CrashHandler.h"
#include "GMBench.h"
#include "ResultsWriter.h"
#include "Stats.h"
#include "Timer.h"
#include "SkCanvas.h"
#include "SkCommonFlags.h"
#include "SkForceLinking.h"
#include "SkGraphics.h"
#include "SkString.h"
#include "SkSurface.h"
#if SK_SUPPORT_GPU
#include "gl/GrGLDefines.h"
#include "GrContextFactory.h"
GrContextFactory gGrFactory;
#endif
__SK_FORCE_IMAGE_DECODER_LINKING;
#if SK_DEBUG
DEFINE_bool(runOnce, true, "Run each benchmark just once?");
#else
DEFINE_bool(runOnce, false, "Run each benchmark just once?");
#endif
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_double(gpuMs, 5, "Target bench time in millseconds for GPU.");
DEFINE_int32(gpuFrameLag, 5, "Overestimate of maximum number of frames GPU allows to lag.");
DEFINE_string(outResultsFile, "", "If given, write results here as JSON.");
DEFINE_int32(maxCalibrationAttempts, 3,
"Try up to this many times to guess loops for a bench, or skip the bench.");
DEFINE_int32(maxLoops, 1000000, "Never run a bench more times than this.");
DEFINE_string(key, "", "Space-separated key/value pairs to add to JSON.");
DEFINE_string(gitHash, "", "Git hash to add to JSON.");
static SkString humanize(double ms) {
if (ms > 1e+3) return SkStringPrintf("%.3gs", ms/1e3);
if (ms < 1e-3) return SkStringPrintf("%.3gns", ms*1e6);
#ifdef SK_BUILD_FOR_WIN
if (ms < 1) return SkStringPrintf("%.3gus", ms*1e3);
#else
if (ms < 1) return SkStringPrintf("%.3gµs", ms*1e3);
#endif
return SkStringPrintf("%.3gms", ms);
}
#define HUMANIZE(ms) humanize(ms).c_str()
static double time(int loops, Benchmark* bench, SkCanvas* canvas, SkGLContextHelper* gl) {
WallTimer timer;
timer.start();
if (bench) {
bench->draw(loops, canvas);
}
if (canvas) {
canvas->flush();
}
#if SK_SUPPORT_GPU
if (gl) {
SK_GL(*gl, Flush());
gl->swapBuffers();
}
#endif
timer.end();
return timer.fWall;
}
static double estimate_timer_overhead() {
double overhead = 0;
for (int i = 0; i < FLAGS_overheadLoops; i++) {
overhead += time(1, NULL, NULL, NULL);
}
return overhead / FLAGS_overheadLoops;
}
static int clamp_loops(int loops) {
if (loops < 1) {
SkDebugf("ERROR: clamping loops from %d to 1.\n", loops);
return 1;
}
if (loops > FLAGS_maxLoops) {
SkDebugf("WARNING: clamping loops from %d to FLAGS_maxLoops, %d.\n", loops, FLAGS_maxLoops);
return FLAGS_maxLoops;
}
return loops;
}
static int cpu_bench(const double overhead, Benchmark* bench, SkCanvas* canvas, double* samples) {
// First figure out approximately how many loops of bench it takes to make overhead negligible.
double bench_plus_overhead;
int round = 0;
do {
bench_plus_overhead = time(1, bench, canvas, NULL);
if (++round == FLAGS_maxCalibrationAttempts) {
SkDebugf("WARNING: Can't estimate loops for %s (%s vs. %s); skipping.\n",
bench->getName(), HUMANIZE(bench_plus_overhead), HUMANIZE(overhead));
return 0;
}
} while (bench_plus_overhead < overhead);
// Later we'll just start and stop the timer once but loop N times.
// We'll pick N to make timer overhead negligible:
//
// overhead
// ------------------------- < FLAGS_overheadGoal
// overhead + N * Bench Time
//
// where bench_plus_overhead ≈ overhead + Bench Time.
//
// Doing some math, we get:
//
// (overhead / FLAGS_overheadGoal) - overhead
// ------------------------------------------ < N
// bench_plus_overhead - overhead)
//
// Luckily, this also works well in practice. :)
const double numer = overhead / FLAGS_overheadGoal - overhead;
const double denom = bench_plus_overhead - overhead;
const int loops = clamp_loops(FLAGS_runOnce ? 1 : (int)ceil(numer / denom));
for (int i = 0; i < FLAGS_samples; i++) {
samples[i] = time(loops, bench, canvas, NULL) / loops;
}
return loops;
}
#if SK_SUPPORT_GPU
static int gpu_bench(SkGLContextHelper* gl,
Benchmark* bench,
SkCanvas* canvas,
double* samples) {
gl->makeCurrent();
// Make sure we're done with whatever came before.
SK_GL(*gl, Finish());
// First, figure out how many loops it'll take to get a frame up to FLAGS_gpuMs.
int loops = 1;
if (!FLAGS_runOnce) {
double elapsed = 0;
do {
loops *= 2;
// If the GPU lets frames lag at all, we need to make sure we're timing
// _this_ round, not still timing last round. We force this by looping
// more times than any reasonable GPU will allow frames to lag.
for (int i = 0; i < FLAGS_gpuFrameLag; i++) {
elapsed = time(loops, bench, canvas, gl);
}
} while (elapsed < FLAGS_gpuMs);
// We've overshot at least a little. Scale back linearly.
loops = (int)ceil(loops * FLAGS_gpuMs / elapsed);
// Might as well make sure we're not still timing our calibration.
SK_GL(*gl, Finish());
}
loops = clamp_loops(loops);
// Pretty much the same deal as the calibration: do some warmup to make
// sure we're timing steady-state pipelined frames.
for (int i = 0; i < FLAGS_gpuFrameLag; i++) {
time(loops, bench, canvas, gl);
}
// Now, actually do the timing!
for (int i = 0; i < FLAGS_samples; i++) {
samples[i] = time(loops, bench, canvas, gl) / loops;
}
return loops;
}
#endif
static SkString to_lower(const char* str) {
SkString lower(str);
for (size_t i = 0; i < lower.size(); i++) {
lower[i] = tolower(lower[i]);
}
return lower;
}
struct Config {
const char* name;
Benchmark::Backend backend;
SkColorType color;
SkAlphaType alpha;
int samples;
#if SK_SUPPORT_GPU
GrContextFactory::GLContextType ctxType;
#else
int bogusInt;
#endif
};
struct Target {
explicit Target(const Config& c) : config(c) {}
const Config config;
SkAutoTDelete<SkSurface> surface;
#if SK_SUPPORT_GPU
SkGLContextHelper* gl;
#endif
};
static bool is_cpu_config_allowed(const char* name) {
for (int i = 0; i < FLAGS_config.count(); i++) {
if (to_lower(FLAGS_config[i]).equals(name)) {
return true;
}
}
return false;
}
#if SK_SUPPORT_GPU
static bool is_gpu_config_allowed(const char* name, GrContextFactory::GLContextType ctxType,
int sampleCnt) {
if (!is_cpu_config_allowed(name)) {
return false;
}
if (const GrContext* ctx = gGrFactory.get(ctxType)) {
return sampleCnt <= ctx->getMaxSampleCount();
}
return false;
}
#endif
#if SK_SUPPORT_GPU
#define kBogusGLContextType GrContextFactory::kNative_GLContextType
#else
#define kBogusGLContextType 0
#endif
// Append all configs that are enabled and supported.
static void create_configs(SkTDArray<Config>* configs) {
#define CPU_CONFIG(name, backend, color, alpha) \
if (is_cpu_config_allowed(#name)) { \
Config config = { #name, Benchmark::backend, color, alpha, 0, kBogusGLContextType }; \
configs->push(config); \
}
if (FLAGS_cpu) {
CPU_CONFIG(nonrendering, kNonRendering_Backend, kUnknown_SkColorType, kUnpremul_SkAlphaType)
CPU_CONFIG(8888, kRaster_Backend, kN32_SkColorType, kPremul_SkAlphaType)
CPU_CONFIG(565, kRaster_Backend, kRGB_565_SkColorType, kOpaque_SkAlphaType)
}
#if SK_SUPPORT_GPU
#define GPU_CONFIG(name, ctxType, samples) \
if (is_gpu_config_allowed(#name, GrContextFactory::ctxType, samples)) { \
Config config = { \
#name, \
Benchmark::kGPU_Backend, \
kN32_SkColorType, \
kPremul_SkAlphaType, \
samples, \
GrContextFactory::ctxType }; \
configs->push(config); \
}
if (FLAGS_gpu) {
GPU_CONFIG(gpu, kNative_GLContextType, 0)
GPU_CONFIG(msaa4, kNative_GLContextType, 4)
GPU_CONFIG(msaa16, kNative_GLContextType, 16)
GPU_CONFIG(nvprmsaa4, kNVPR_GLContextType, 4)
GPU_CONFIG(nvprmsaa16, kNVPR_GLContextType, 16)
GPU_CONFIG(debug, kDebug_GLContextType, 0)
GPU_CONFIG(nullgpu, kNull_GLContextType, 0)
}
#endif
}
// If bench is enabled for config, returns a Target* for it, otherwise NULL.
static Target* is_enabled(Benchmark* bench, const Config& config) {
if (!bench->isSuitableFor(config.backend)) {
return NULL;
}
SkImageInfo info;
info.fAlphaType = config.alpha;
info.fColorType = config.color;
info.fWidth = bench->getSize().fX;
info.fHeight = bench->getSize().fY;
Target* target = new Target(config);
if (Benchmark::kRaster_Backend == config.backend) {
target->surface.reset(SkSurface::NewRaster(info));
}
#if SK_SUPPORT_GPU
else if (Benchmark::kGPU_Backend == config.backend) {
target->surface.reset(SkSurface::NewRenderTarget(gGrFactory.get(config.ctxType), info,
config.samples));
target->gl = gGrFactory.getGLContext(config.ctxType);
}
#endif
if (Benchmark::kNonRendering_Backend != config.backend && !target->surface.get()) {
delete target;
return NULL;
}
return target;
}
// Creates targets for a benchmark and a set of configs.
static void create_targets(SkTDArray<Target*>* targets, Benchmark* b,
const SkTDArray<Config>& configs) {
for (int i = 0; i < configs.count(); ++i) {
if (Target* t = is_enabled(b, configs[i])) {
targets->push(t);
}
}
}
static void fill_static_options(ResultsWriter* log) {
#if defined(SK_BUILD_FOR_WIN32)
log->option("system", "WIN32");
#elif defined(SK_BUILD_FOR_MAC)
log->option("system", "MAC");
#elif defined(SK_BUILD_FOR_ANDROID)
log->option("system", "ANDROID");
#elif defined(SK_BUILD_FOR_UNIX)
log->option("system", "UNIX");
#else
log->option("system", "other");
#endif
}
#if SK_SUPPORT_GPU
static void fill_gpu_options(ResultsWriter* log, SkGLContextHelper* ctx) {
const GrGLubyte* version;
SK_GL_RET(*ctx, version, GetString(GR_GL_VERSION));
log->configOption("GL_VERSION", (const char*)(version));
SK_GL_RET(*ctx, version, GetString(GR_GL_RENDERER));
log->configOption("GL_RENDERER", (const char*) version);
SK_GL_RET(*ctx, version, GetString(GR_GL_VENDOR));
log->configOption("GL_VENDOR", (const char*) version);
SK_GL_RET(*ctx, version, GetString(GR_GL_SHADING_LANGUAGE_VERSION));
log->configOption("GL_SHADING_LANGUAGE_VERSION", (const char*) version);
}
#endif
class BenchmarkStream {
public:
BenchmarkStream() : fBenches(BenchRegistry::Head()) , fGMs(skiagm::GMRegistry::Head()) {}
Benchmark* next(const char** sourceType) {
if (fBenches) {
Benchmark* bench = fBenches->factory()(NULL);
fBenches = fBenches->next();
*sourceType = "bench";
return bench;
}
while (fGMs) {
SkAutoTDelete<skiagm::GM> gm(fGMs->factory()(NULL));
fGMs = fGMs->next();
if (gm->getFlags() & skiagm::GM::kAsBench_Flag) {
*sourceType = "gm";
return SkNEW_ARGS(GMBench, (gm.detach()));
}
}
return NULL;
}
private:
const BenchRegistry* fBenches;
const skiagm::GMRegistry* fGMs;
};
int nanobench_main();
int nanobench_main() {
SetupCrashHandler();
SkAutoGraphics ag;
if (FLAGS_runOnce) {
FLAGS_samples = 1;
FLAGS_gpuFrameLag = 0;
}
MultiResultsWriter log;
SkAutoTDelete<NanoJSONResultsWriter> json;
if (!FLAGS_outResultsFile.isEmpty()) {
const char* gitHash = FLAGS_gitHash.isEmpty() ? "unknown-revision" : FLAGS_gitHash[0];
json.reset(SkNEW(NanoJSONResultsWriter(FLAGS_outResultsFile[0], gitHash)));
log.add(json.get());
}
CallEnd<MultiResultsWriter> ender(log);
if (1 == FLAGS_key.count() % 2) {
SkDebugf("ERROR: --key must be passed with an even number of arguments.\n");
return 1;
}
for (int i = 1; i < FLAGS_key.count(); i += 2) {
log.key(FLAGS_key[i-1], FLAGS_key[i]);
}
fill_static_options(&log);
const double overhead = estimate_timer_overhead();
SkDebugf("Timer overhead: %s\n", HUMANIZE(overhead));
SkAutoTMalloc<double> samples(FLAGS_samples);
if (FLAGS_runOnce) {
SkDebugf("--runOnce is true; times would only be misleading so we won't print them.\n");
} else if (FLAGS_verbose) {
// No header.
} else if (FLAGS_quiet) {
SkDebugf("median\tbench\tconfig\n");
} else {
SkDebugf("loops\tmin\tmedian\tmean\tmax\tstddev\tsamples\tconfig\tbench\n");
}
SkTDArray<Config> configs;
create_configs(&configs);
BenchmarkStream benches;
const char* sourceType;
while (Benchmark* b = benches.next(&sourceType)) {
SkAutoTDelete<Benchmark> bench(b);
if (SkCommandLineFlags::ShouldSkip(FLAGS_match, bench->getName())) {
continue;
}
SkTDArray<Target*> targets;
create_targets(&targets, bench.get(), configs);
if (!targets.isEmpty()) {
log.bench(bench->getName(), bench->getSize().fX, bench->getSize().fY);
bench->preDraw();
}
for (int j = 0; j < targets.count(); j++) {
SkCanvas* canvas = targets[j]->surface.get() ? targets[j]->surface->getCanvas() : NULL;
const char* config = targets[j]->config.name;
const int loops =
#if SK_SUPPORT_GPU
Benchmark::kGPU_Backend == targets[j]->config.backend
? gpu_bench(targets[j]->gl, bench.get(), canvas, samples.get())
:
#endif
cpu_bench( overhead, bench.get(), canvas, samples.get());
if (loops == 0) {
SkDebugf("Unable to time %s\t%s (overhead %s)\n",
bench->getName(), config, HUMANIZE(overhead));
continue;
}
Stats stats(samples.get(), FLAGS_samples);
log.config(config);
log.configOption("source_type", sourceType);
#if SK_SUPPORT_GPU
if (Benchmark::kGPU_Backend == targets[j]->config.backend) {
fill_gpu_options(&log, targets[j]->gl);
}
#endif
log.timer("min_ms", stats.min);
log.timer("median_ms", stats.median);
log.timer("mean_ms", stats.mean);
log.timer("max_ms", stats.max);
log.timer("stddev_ms", sqrt(stats.var));
if (FLAGS_runOnce) {
if (targets.count() == 1) {
config = ""; // Only print the config if we run the same bench on more than one.
}
SkDebugf("%s\t%s\n", bench->getName(), config);
} else if (FLAGS_verbose) {
for (int i = 0; i < FLAGS_samples; i++) {
SkDebugf("%s ", HUMANIZE(samples[i]));
}
SkDebugf("%s\n", bench->getName());
} else if (FLAGS_quiet) {
if (targets.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.median), bench->getName(), config);
} else {
const double stddev_percent = 100 * sqrt(stats.var) / stats.mean;
SkDebugf("%d\t%s\t%s\t%s\t%s\t%.0f%%\t%s\t%s\t%s\n"
, loops
, HUMANIZE(stats.min)
, HUMANIZE(stats.median)
, HUMANIZE(stats.mean)
, HUMANIZE(stats.max)
, stddev_percent
, stats.plot.c_str()
, config
, bench->getName()
);
}
}
targets.deleteAll();
#if SK_SUPPORT_GPU
if (FLAGS_abandonGpuContext) {
gGrFactory.abandonContexts();
}
if (FLAGS_resetGpuContext || FLAGS_abandonGpuContext) {
gGrFactory.destroyContexts();
}
#endif
}
return 0;
}
#if !defined SK_BUILD_FOR_IOS
int main(int argc, char** argv) {
SkCommandLineFlags::Parse(argc, argv);
return nanobench_main();
}
#endif
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