The goal is to determine if the overhead of multiple setTimeout is heavier than a single setInterval.
Each test has 60 iterations of a function wait that takes 30ms to run, making the program time 60*30=1800ms, so running these files should capture the overhead by subtracting 1800ms from the total run time.
It took around 1816ms or around ~16ms of overhead.
It took around 3779ms or aorund ~1979ms of overhead.
It took around 3769ms or around ~1969ms of overhead.
| function wait (delay) { | |
| ++waitCalls | |
| if (typeof delay !== 'number') delay = 3 | |
| var start = new Date().getTime() | |
| while (new Date().getTime() < start + delay) continue | |
| } | |
| function run () { | |
| var id = setInterval(function () { | |
| if (waitCalls >= 60) { | |
| return clearInterval(id) | |
| } | |
| wait(30) | |
| }, 0) | |
| } | |
| var start = Date.now() | |
| var waitCalls = 0 | |
| run() | |
| process.on('exit', function () { | |
| console.log('count', waitCalls, Date.now() - start) | |
| }) |
| function wait (delay) { | |
| ++waitCalls | |
| if (typeof delay !== 'number') delay = 3 | |
| var start = new Date().getTime() | |
| while (new Date().getTime() < start + delay) continue | |
| } | |
| function run () { | |
| setTimeout(function foo () { | |
| wait(30) | |
| if (waitCalls < 60) { | |
| setTimeout(foo, 0) | |
| } | |
| }, 0) | |
| } | |
| var start = Date.now() | |
| var waitCalls = 0 | |
| run() | |
| process.on('exit', function () { | |
| console.log('count', waitCalls, Date.now() - start) | |
| }) |
| function wait (delay) { | |
| ++waitCalls | |
| if (typeof delay !== 'number') delay = 3 | |
| var start = new Date().getTime() | |
| while (new Date().getTime() < start + delay) continue | |
| } | |
| function run () { | |
| for (var i = 0; i < 60; i++) { | |
| setTimeout(function () { | |
| wait(30) | |
| }, 0) | |
| } | |
| } | |
| var start = Date.now() | |
| var waitCalls = 0 | |
| run() | |
| process.on('exit', function () { | |
| console.log('count', waitCalls, Date.now() - start) | |
| }) |