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COSMIC Alpha 4 Released For System76's Rust-Based Desktop

2 years ago by Karna to c/linux

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OsrsNeedsF2P 2 points 2 years ago

memory leak fixes,

But muh Rust??

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naonintendois 37 points 2 years ago

Rust doesn't prevent memory leaks. You can do that in every language

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OsrsNeedsF2P 25 points 2 years ago

Back when I was a wee bit Java noob, I was trying to write a RuneScape bot to play Soul Wars. I had a basic recursive pathfinding algo for figuring out how to walk around the map, but it blew out of memory very quickly (each tile has 4 options, do that recursively, etc). So I added caching. Anyways, I never cleared the caching. So after 20 minutes of running the script, you had like 2GB of allocated RAM calculating the best path from any 2 tiles in the minigame.

Great times. No amount of language safety features would have saved me from that stupidity.

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ryannathans 2 points 2 years ago

Oops, banned for botting

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flashgnash 4 points 2 years ago

Thought the whole point was that it forced you to handle memory properly and automatically released things when they go out of scope

What kind of situation can cause a memory leak in rust

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naonintendois 4 points 2 years ago

You can have a memory leak when items are still in scope in some loop or when you have a reference count cycle. The latter happens with the Rc/Arc types in rust.

An example for the former can be a web server that keeps track of every request it's ever received in memory. You will eventually run out of memory. But you did not violate any memory rules (dangling pointer, etc.). Memory leaks can be caused by design issues.

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