measuring the memory usage, execution time, and performance of a JavaScript function

Question

Iv looked around for a existing lib/solution for what I want but can't find anything, so Im looking to do it myself, and looking for some pointers.

Im looking to create a javascript testing suite, to do a/b testing on two function, so lets just say I have

function foo(){ var x = new Object();}

and

function bar(){var x = {};}

I want to be able to measure the execution time, the memory usage and any other useful stats (like how benchmark can show operations per second)

What ways are there, using javascript, to measure the above

I know a few, but It would be nice to start from fresh and see what else is out there, so all suggestions are very much welcome

thanks

N.B Im not asking for browser plugins or chrome dev tools, the measuring needs to be done in js

Seimen · Accepted Answer · 2012-07-12 15:20:05Z

2

var start = new Date().getTime();
*Your Code*
var end = new Date().getTime(),
    time = end - start,
    execs = 1000 / time;

console.log('time in ms: '+time);
console.log('operations per second: '+execs);

No idea how you would get the memory usage of the execution...

answered Jul 12, 2012 at 15:20

Seimen

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3 Comments

atmd Over a year ago

great stuff. I wonder if this is more accurate then using console.time()? Anyone know?

Seimen Over a year ago

It's pretty hard to say whether console.time() with console.timeEnd() or my approach is more accurate, in my test they always have a maximum of 1ms difference

atmd Over a year ago

just looked at some of the benchmark.js stuff and they seem to use the new Date() method

Guard · Accepted Answer · 2012-07-12 15:12:45Z

1

performance / time: jsperf.com

other profiling - try Chrome's Inspector

answered Jul 12, 2012 at 15:12

Guard

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3 Comments

alestanis Over a year ago

This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post.

Guard Over a year ago

jsperf.com doesn't help comparing 2 JS functions performance? funny

alestanis Over a year ago

The comment below is an automatic comment left when reviewing a "low quality" post. Yours looks like a comment, so it should be transformed into one. If you don't want your answers to be flagged as low quality the next time you can try adding some more explanations or example code.

Steve Ingram · Accepted Answer · 2019-08-16 14:43:46Z

0

Another option (for execution timing), if you are using/can use Node.js is process.hrtime()

See this link for details/example:

Measurement with process.hrtime()

And for memory usage:

Sizeof.js

answered Aug 16, 2019 at 14:43

Steve Ingram

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Comments

mehrdad · Accepted Answer · 2020-09-08 12:46:40Z

0

For memory usage maybe you can use something like window.performance.memory like this:

console.log(performance.memory.usedJSHeapSize);

The result is in bytes.

answered Sep 8, 2020 at 12:46

mehrdad

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