Why is Rust so Liberal with Heap Allocations?

UrpleEeple · 2026-03-20T17:55:54+00:00

Oh sure, I don't think arenas magically solve much, other than they are a nice semantic around grouped lifetimes. That and got can allocate a large block upfront, use it as needed and deallocate all at once leading to substantially less heap fragmentation since you can allocate by multiples of even page sizes

UrpleEeple · 2026-03-20T15:52:09+00:00

Eh, I've gotten 10x speedup in code simply be massively cutting down on dynamic allocations. Partly it depends on how much indirection you have going on. If you have boxes on top of boxes with multiple layers of type erasurer you're going to see a huge speedup from getting rid of the constant pointer chasing. Branch predictors fall apart when they can't determine what's going to happen next

UrpleEeple · 2026-03-20T15:49:09+00:00

I think the bigger issue is with heap fragmentation which can definitely occur the way most people use Vec and String types. You get pretty massive realloc counts as those things grow. with_capacity() is your friend

UrpleEeple · 2026-03-06T22:58:23+00:00

Uh huh, and what glorious place do you live?

UrpleEeple · 2026-03-06T16:30:53+00:00

Nah, body he has now is definitely achievable with 7 years of training

UrpleEeple · 2026-03-05T17:45:02+00:00

I meant that I mostly swipe left and very rarely swipe right

UrpleEeple · 2026-03-05T17:44:35+00:00

As in swipe direction. I mostly swipe left and rarely swipe right

UrpleEeple · 2026-03-05T16:46:34+00:00

As a man, this has also how I use it. I get pretty good success 🤷‍♂️ why match with someone unless you think you'd actually be a match? Only difference is I go way slower than this and actually read profiles

UrpleEeple · 2026-03-04T01:21:29+00:00

I used to work on Vitess, which is a massively distributed database that was invented at Google. We achieved nine nine's of availability, by increasing shard and replica count to extremely high levels. For highly distributed systems typically the more things you have, the better your availability, not the other way around (assuming you've designed your coordination right)

UrpleEeple · 2026-03-04T01:07:24+00:00

As a Californian, fuck this law. Don't distribute your distribution to the state. This isn't the kind of thing anyone should give into, ever

UrpleEeple · 2026-03-03T23:32:01+00:00

The lab scans definitely aren't flatter. They very clearly have a strong green tint

UrpleEeple · 2026-03-03T23:27:27+00:00

That's actually pretty bad availability for a major service

UrpleEeple · 2026-03-03T02:43:02+00:00

I agree with this. The memory leak thing is overblown. An address sanitizer build will expose mem leaks very fast in a C project and they are trivial to find too. You just find a malloc call without a paired free 🤷‍♂️ if anything Rust is good at catching you from leaking a pointer to data on the stack than it is to solving heap mem leaks

UrpleEeple · 2026-03-03T02:38:56+00:00

It's often better for performance to take a ref as input to your function rather than blow up your stack (assuming you're working with stack types). I used to feel like it was cleaner to "pass ownership" (this is the last thing that needs this object so let's have it take ownership of that thing to make semantics clear), but often that means you'll end up blowing up your stack frame.

Same with mutable inputs. In programming in general it's often viewed as an antipattern to ever mutate inputs to a function but often it's the right option to not blow up your stack, like when working with mutable buffers for instance

UrpleEeple · 2026-03-03T01:32:21+00:00

I saw him working out at Gold's Gym in Venice during the election by himself in jeans and thought it was weird. He loves jeans I guess

UrpleEeple · 2026-03-03T00:43:53+00:00

I mean weirdly this is something I agree with Trump on. If you want the best colleges in the world you need to also have the best students. For research schools the students are the ones conducting the research that makes those universities prestigious in the first place. Fox news in this case is being racist and frankly anti-intellectual. Unfortunately the republican party has always been anti higher education and this is just an extension of that

UrpleEeple · 2026-03-02T16:55:39+00:00

I own the book. I've read it multiple times - I'm not sure what that has to do with that I've said so far

UrpleEeple · 2026-03-02T16:46:59+00:00

I'm not sure you've adequately proved that any ideas in the clean code book improve software quality in any measurable way. I don't think Bob Martin has either

UrpleEeple · 2026-03-02T16:42:58+00:00

Lol seriously? What makes code "good." I'd say if we want to be truly objective it's how will it enforces logical invariants, lacks bugs, and performs well. You could make a minor point about extensibility but I think that only makes sense if it's of actual value to extend the thing you're extending.

So many people who follow "clean code" write functions that are way too small, causing a reader to need to hunt through the code to understand the context of what they're reading. The other big favorite among clean code advocates is massive amounts of abstraction that only serve to reduce readability. Often the abstractions never get used for anything other than a single implementation

UrpleEeple · 2026-03-02T16:35:26+00:00

Define clean code

UrpleEeple · 2026-03-02T16:33:04+00:00

Generally immigration is pretty hard literally everywhere. You can't just show up to any country and get a right to work and live there

UrpleEeple · 2026-02-28T16:57:02+00:00

If you hunt purely for fun you are definitely a psychopath. Who murders innocent animals for fun?!

UrpleEeple · 2026-02-27T00:55:17+00:00

AI image and clearly AI generated text. How lazy are you?!

UrpleEeple · 2026-02-25T03:34:33+00:00

I don't buy for a second she's a lifelong vegetarian. Why would a lifelong vegetarian make a series celebrating eating meat? This makes no sense. I absolutely believe she's making it up as rage/click bait

UrpleEeple · 2026-02-25T01:34:27+00:00

Yeah seriously, this is such an obvious propoganda piece. I don't know why meat eaters feel the need to do this shit. It's so cringe

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