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/**
* MIT License
*
* Copyright (c) 2019 Miško Hevery
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Source: https://github.com/mhevery/AngularConnect-2019
*/
// tslint:disable
import { performance } from 'perf_hooks';
const MIN_SAMPLE_COUNT_NO_IMPROVEMENT = 100;
const MIN_SAMPLE_DURATION = 2;
const UNITS = ['ms', 'us', 'ns', 'ps'];
export interface Benchmark {
(versionName: string): Profile;
report(fn?: (report: string) => void): void;
}
export interface Profile {
(): boolean;
profileName: string;
bestTime: number;
iterationCount: number;
sampleCount: number;
noImprovementCount: number;
}
export function createBenchmark(benchmarkName: string): Benchmark {
const profiles: Profile[] = [];
const benchmark = function Benchmark(profileName: string): Profile {
let iterationCounter: number = 0;
let timestamp: number = 0;
const profile: Profile = function Profile(): boolean {
if (iterationCounter === 0) {
let runAgain = false;
// if we reached the end of the iteration count than we should decide what to do next.
if (timestamp === 0) {
// this is the first time we are executing
iterationCounter = profile.iterationCount;
runAgain = true;
// console.log('profiling', profileName, '...');
} else {
profile.sampleCount++;
// we came to an end of a sample, compute the time.
const durationMs = performance.now() - timestamp;
const iterationTimeMs = Math.max(durationMs / profile.iterationCount, 0);
if (profile.bestTime > iterationTimeMs) {
profile.bestTime = iterationTimeMs;
profile.noImprovementCount = 0;
runAgain = true;
} else {
runAgain = profile.noImprovementCount++ < MIN_SAMPLE_COUNT_NO_IMPROVEMENT;
}
if (durationMs < MIN_SAMPLE_DURATION) {
// we have not ran for long enough so increase the iteration count.
profile.iterationCount = Math.max(
// As a sanity if duration_ms is 0 just double the count.
profile.iterationCount << 1,
// Otherwise try to guess how many iterations we have to do to get the right time.
Math.round((MIN_SAMPLE_DURATION / durationMs) * profile.iterationCount)
);
profile.noImprovementCount = 0;
runAgain = true;
}
}
iterationCounter = profile.iterationCount;
timestamp = performance.now();
return runAgain;
} else {
// this is the common path and it needs te be quick!
iterationCounter--;
return true;
}
} as Profile;
profile.profileName = profileName;
profile.bestTime = Number.MAX_SAFE_INTEGER;
profile.iterationCount = 1;
profile.noImprovementCount = 0;
profile.sampleCount = 0;
profiles.push(profile);
return profile;
} as Benchmark;
benchmark.report = function(fn?: (report: string) => void) {
const fastest = profiles.reduce((previous: Profile, current: Profile) => {
return previous.bestTime < current.bestTime ? previous : current;
});
let unitOffset = 0;
let time = fastest.bestTime;
while (time < 1 && time !== 0) {
time = time * 1000;
unitOffset++;
}
const unit: string = UNITS[unitOffset];
(fn || console.log)(
`Benchmark: ${benchmarkName}\n${profiles
.map((profile: Profile) => {
const time = (profile.bestTime * Math.pow(1000, unitOffset)).toFixed(3);
const percent = (100 - (profile.bestTime / fastest.bestTime) * 100).toFixed(0);
return ' ' + profile.profileName + ': ' + time + ' ' + unit + '(' + percent + '%)';
})
.join('\n')}`
);
};
return benchmark;
}
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