f27f08b76d
The same timer with a simpler interface. BUG=skia: Review URL: https://codereview.chromium.org/1427033003
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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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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*/
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#include "TimingStateMachine.h"
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#include "SkCanvas.h"
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#include "SkCommandLineFlags.h"
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DEFINE_int32(gpuFrameLag, 5, "Overestimate of maximum number of frames GPU is allowed to lag.");
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DEFINE_int32(frames, 5, "Number of frames of each skp to render per sample.");
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DEFINE_double(loopMs, 5, "Each benchmark will be tuned until it takes loopsMs millseconds.");
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static double now_ms() { return SkTime::GetNSecs() * 1e-6; }
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TimingStateMachine::TimingStateMachine()
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: fCurrentFrame(0)
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, fLoops(1)
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, fLastMeasurement(0.)
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, fState(kPreWarm_State)
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, fInnerState(kTuning_InnerState) {
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}
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TimingStateMachine::ParentEvents TimingStateMachine::nextFrame(bool preWarmBetweenSamples) {
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ParentEvents parentEvent = kTiming_ParentEvents;
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switch (fState) {
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case kPreWarm_State: {
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if (fCurrentFrame >= FLAGS_gpuFrameLag) {
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fCurrentFrame = 0;
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fStartTime = now_ms();
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fState = kTiming_State;
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} else {
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fCurrentFrame++;
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}
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break;
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}
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case kTiming_State: {
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switch (fInnerState) {
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case kTuning_InnerState: {
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if (1 << 30 == fLoops) {
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// We're about to wrap. Something's wrong with the bench.
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SkDebugf("InnerLoops wrapped\n");
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fLoops = 1;
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} else {
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double elapsedMs = this->elapsed();
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if (elapsedMs < FLAGS_loopMs) {
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fLoops *= 2;
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} else {
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fInnerState = kTiming_InnerState;
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}
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fState = kPreWarm_State;
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this->resetTimingState();
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parentEvent = kReset_ParentEvents;
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}
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break;
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}
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case kTiming_InnerState: {
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if (fCurrentFrame >= FLAGS_frames) {
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this->recordMeasurement();
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this->resetTimingState();
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parentEvent = kTimingFinished_ParentEvents;
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if (preWarmBetweenSamples) {
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fState = kPreWarm_State;
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} else {
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fStartTime = now_ms();
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}
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} else {
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fCurrentFrame++;
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}
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break;
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}
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}
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}
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break;
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}
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return parentEvent;
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}
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inline double TimingStateMachine::elapsed() {
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return now_ms() - fStartTime;
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}
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void TimingStateMachine::resetTimingState() {
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fCurrentFrame = 0;
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}
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void TimingStateMachine::recordMeasurement() {
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fLastMeasurement = this->elapsed() / (FLAGS_frames * fLoops);
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}
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void TimingStateMachine::nextBenchmark() {
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fLoops = 1;
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fInnerState = kTuning_InnerState;
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fState = kPreWarm_State;
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}
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