How can I debug the memory usage of my code? | Bun | Page 1

zenith cloud Apr 13, 2024, 2:38 PM

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I have a program that seems to have a memory leak, but I'm not sure how to debug it

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I'm running my program in a docker container in production. I would like to debug memory usage in prod.

restive crag Apr 13, 2024, 2:54 PM

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require(“bun:jsc”).heapStats() will give you an object with a bunch of data about what’s in the heap

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You can also use the —smol flag to use a smaller heap

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You can use process.memoryUsage() to get the current memory usage

zenith cloud Apr 13, 2024, 2:54 PM

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restive crag require(“bun:jsc”).heapStats() will give you an object with a bunch of data abou...

I have seen this, but it's unclear to me how to associate this data with a problem in my code

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apart from the object type count which can lead me in the right direction

restive crag Apr 13, 2024, 2:55 PM

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You can use bun —inspect and then get a heap profile

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And then it will show you a graph of why various objects exist in memory

zenith cloud Apr 13, 2024, 2:55 PM

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i'll try that locally then, as it's pretty janky to do in prod

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thanks!

restive crag Apr 13, 2024, 2:55 PM

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To be clear I think it’s kind of not great right now

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We really need some kind of monitoring thing

zenith cloud Apr 13, 2024, 5:43 PM

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okay looking into this a bit more, it seems to be that intentionally unhandled promises are staying in memory including their context. seems like a bun issue as i can't reproduce with the exact same code in node

restive crag Apr 14, 2024, 1:29 AM

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If you call .then on them

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But leave the catch callback

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Does it change anything

#How can I debug the memory usage of my code?