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Something wrong with the implementation of the "promise.then" #3414
Description
Win 7 x64 | Node.js v4.2.1
Code:
var t = 1000 * 1000 * 1;
function fCookie(x, z) {
return new Promise(resolve => resolve(x + z));
}
console.time("#1 | Promise");
while(t--) fCookie(1, 3).then(function(r) {});
console.timeEnd("#1 | Promise");Results:
//-] Without: ".then"
//> 1m - 400ms - 20Mb RAM (nodejs Promise)
//> 1m - 300ms - 15Mb RAM (bluebird Promise)
//-] With: ".then"
//> 1m - 4899ms - 1.1Gb RAM (nodejs Promise) ~ (4x | 3x)
//> 1m - 1255ms - 370Mb RAM (bluebird Promise)
So a lot of memory, so slow ...
Activity
thefourtheye commentedon Oct 17, 2015
Most likely a v8 thing, as Node.js uses underlying v8's
Promiseimplementation.benjamingr commentedon Oct 18, 2015
Yes, native promises are slower and consume more memory than bluebird promises, this is a well known fact. I think the issue can be closed.
Trott commentedon Oct 18, 2015
According to this from the v8 mailing list:
If you have further questions/concerns, I would recommend participating over there. (Promises aren't in Node core. They're supplied by v8.)