How to monitor memory consumption by nodejs

Question

My nodejs script fails with following error,

<--- Last few GCs --->

[78:0x29f56b0]    31470 ms: Scavenge 2041.7 (2050.3) -> 2041.9 (2051.5) MB, 9.3 / 0.0 ms  (average mu = 0.231, current mu = 0.213) allocation failure 
[78:0x29f56b0]    31547 ms: Scavenge 2042.8 (2051.5) -> 2042.5 (2047.8) MB, 14.9 / 0.0 ms  (average mu = 0.231, current mu = 0.213) allocation failure 


<--- JS stacktrace --->

==== JS stack trace =========================================

    0: ExitFrame [pc: 0x134e879]
Security context: 0x01e8352c0919 <JSObject>
...

Now, I want to know the memory consumption by nodejs's V8 engine in runtime while my script is being executed. How can I do that ?

Does this answer your question? How to monitor the memory usage of Node.js? — Kael Watts-Deuchar
– Kael Watts-Deuchar, Commented Jan 3, 2020 at 8:13

Goran · Accepted Answer · 2020-01-03 09:19:14Z

1

If you want to go with native nodejs solution you can use process.memoryUsage() function.

You can read more about it here.

I have written a small helper script for myself that returns formatted memory consumption that is easy to read (values are calculated to MBs):

function getMemory() {
    return Object.entries(process.memoryUsage()).reduce((carry, [key, value]) => {
        return `${carry}${key}:${Math.round(value / 1024 / 1024 * 100) / 100}MB;`;
    }, "");
};

The output of this function looks like this:

rss:282.61MB;heapTotal:239.46MB;heapUsed:129.36MB;external:22.13MB;

answered Jan 3, 2020 at 9:19

Goran

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Comments

abhinavsinghvirsen · Accepted Answer · 2020-01-03 08:28:42Z

0

if you want to check for global memeory go for

var os = require('os');

os.freemem();
os.totalmem();

or you want node specific then go for

memwatch-next

for tutorial click

answered Jan 3, 2020 at 8:28

abhinavsinghvirsen

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