CODEWITHSUNDEEP
node.jsmemory-managementmemory-leakssharp
anix
anix

Reputation: 345

Node JS memory management on ARM single board

I am using sharp image processing module to resize the image and render it on UI.

app.get('/api/preview-small/:filename',(req,res)=>{
    let filename = req.params.filename;


    sharp('files/' + filename)
        .resize(200, 200, {
            fit: sharp.fit.inside,
            withoutEnlargement: true
        })
        .toFormat('jpeg')
        .toBuffer()
        .then(function(outputBuffer) {
            res.writeHead('200',{"Content-Type":"image/jpeg"});
            res.write(outputBuffer);
            res.end();
        });

});

I am running above code on a single board computer Rock64 with 1 GB ram. When I run a Linux htop command and monitor the memory utilization, I could see the memory usage is adding up exponentially from 10% to 60% after every call to the nodejs app and it never comes down.

CPU USAGE enter image description here

CPU Usage

Though it does not give any issue running the application, my only concern is memory usage does not come down, even when the app is not running and I am not sure if this will crash the application eventually if this application runs continuously.

or if I move a similar code snippet to the cloud will it keep occupying memory even when it's not running?

Anyone who is using sharp module facing the similar issue or is this a known issue with node.js. Do we have a way to flush out/clear out the memory or will node do garbage collection?

Any help is appreciated. Thanks

Upvotes: 0

Views: 378

Answers (1)

jcupitt
jcupitt

Reputation: 11179

sharp has some memory debugging stuff built in:

http://sharp.dimens.io/en/stable/api-utility/#cache

You can control the libvips cache, and get stats about resource usage.

The node version has a very strong effect on memory behaviour. This has been discussed a lot on the sharp issue tracker, see for example:

https://github.com/lovell/sharp/issues/429

Or perhaps:

https://github.com/lovell/sharp/issues/778

Upvotes: 1

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