Excessive memory usage

[visvk]

Hi, with simple code

const moment = require('moment')
require('moment-duration-format')

for(var i = 1; i < 10000; i++) {
   moment.duration(i, 'seconds').format('d [days] h [hours] m [mins]')
}

the process grown up to ~350MB. Is this an expected behavior?

moment 2.22.2 moment-duration-format 2.2.2 node v9.9.0

[carloscasalar]

I've run this script and I haven't observed that huge amount of memory usage:

const os = require('os');
const moment = require('moment')
require('moment-duration-format')

const showMemoryUsage = (when) => {
    const used = process.memoryUsage();

    console.log(`aprox memory usage ${when}:`);
    Object.keys(used).forEach(key => {
        const memory = Math.round(used[key] / 1024 / 1024 * 100 ) / 100;    
        console.log(`${key}: ${memory} MB`)
    });
    console.log('\n');
}

for(var i = 1; i < 10000; i++) {
   moment.duration(i, 'seconds').format('d [days] h [hours] m [mins]')
}

showMemoryUsage('at the end');

Output:

aprox memory usage at the end:
rss: 45.93 MB
heapTotal: 17.23 MB
heapUsed: 6.34 MB
external: 0.01 MB

[visvk]

This bug is related to node v9.9 With node v10 (v10.11.0) there is no memory leak.
I've re-run your code in node v9.9 :

aprox memory usage at the end:
rss: 332.03 MB
heapTotal: 49.33 MB
heapUsed: 21.21 MB
external: 0.01 MB

[carloscasalar]

Thanks for your reply @visvk

Then may this issue be closed.