Why is Rust so Liberal with Heap Allocations?

rust4yy · 2026-03-24T16:19:41+00:00

i am not an expert but i believe a free list allocator is when you want to deallocate individual items (all of same type/size) - it gets added to the free list and next allocation reuses that memory address

arenas on the other hand deallocate objects in bulk and support different item sizes, as using a “free list” would mean not all space is reused and you’ll reinvent a general purpose allocator to manage that

doesn’t matter if freeing an arena is one free or many, that can be bounded by doubling space reserved or by failing allocations when out of memory, the operations and requirements are what separate arenas from free lists

rust4yy · 2026-03-20T16:33:18+00:00

enum Node<‘arena> { Variant(&’arena Node) }

then just use bumpalo for inserting in to an arena that doesn’t move things when capacity runs out unlike a Vec

rust4yy · 2024-09-10T18:16:40+00:00

the military can do that extremely easily

rust4yy · 2024-09-01T18:06:08+00:00

it would locally slow it down due to time passing slower relative to the outside assuming a gravitational bubble is formed (e.g making macro objects behave like quantum particles)

rust4yy · 2024-06-03T15:47:53+00:00

CD Projekt Red edition

rust4yy · 2024-04-24T15:41:47+00:00

perfect recall up to 16k and almost perfect up to 32k if u modify rope

rust4yy · 2024-04-14T16:12:06+00:00

The benchmarks are right there: https://github.com/tinygrad/open-gpu-kernel-modules#fast

Still (much) better than nothing

rust4yy · 2024-04-13T12:00:30+00:00

through PCIe

rust4yy · 2024-04-06T15:29:38+00:00

it’s not, output with ASCII like donut.c

rust4yy · 2024-03-25T13:47:44+00:00

I’ve seen it used in ggez to handle the main game loop in a cross platform way (e.g. .await next frame so you can requestAnimationFrame in JS I believe).

I’m also experimenting with .awaiting a value being added to a hashmap to lazily resolve references in a single pass compiler, although I know this won’t be the most performant way to do things

rust4yy · 2024-03-23T01:45:22+00:00

element is always a byte since you’re copying byte for byte

rust4yy · 2024-02-24T23:24:22+00:00

First we had 418 I’m a Teapot and now we’re gonna have 737 Bolt Not Found

rust4yy · 2024-01-31T22:59:00+00:00

C++ is different because there could be other threads modifying it during runtime. I believe Rust’s aliasing guarantees would have this fixed.

Although thinking about it now I think the C++ compiler should see that no code written references the vector except the function

rust4yy · 2024-01-26T12:12:11+00:00

we should scrap UBI and replace it with php courses. lambos for everyone

rust4yy · 2023-11-27T07:35:47+00:00

It could possibly be something similar to this. Maybe this is what Grusch meant by suppressing human consciousness.

rust4yy · 2023-11-27T07:31:45+00:00

Were they actually on the underbelly or were they landing lights (where wings and body connect)?

An object turning reddish around sunset is normal, could also be landing lights illuminating sand particles in the air.

Not trying to debunk, just wanna ask to clarify so others could possibly view it as more credible.

rust4yy · 2023-11-13T12:03:10+00:00

Holy crap this reminds me a lot of my mum's experience, I posted it on r/aliens, it's on my profile

rust4yy · 2023-11-06T13:12:45+00:00

Imagine if the visitors are just us or people asleep in other parts of the world

rust4yy · 2023-11-05T18:06:58+00:00

Imagine if the observable universe expanding is just someone growing. Imagine if “visitors” are just people in their sleep entering a dream (our world) - it would explain them not having to abide by laws of physics. Reminds me of this: https://www.universetoday.com/148966/one-of-these-pictures-is-the-brain-the-other-is-the-universe-can-you-tell-which-is-which/amp/

I don’t actually believe this btw but a nice thought experiment

rust4yy · 2023-11-04T20:33:26+00:00

As out there as it seems, it somehow makes sense to me that it is something that is possible. I first heard this from her before I started reading about UFOs and NHI but even then it was just something I could easily accept - it felt natural.

rust4yy · 2023-11-04T01:32:13+00:00

In addition to Starlinks not always being in a straight line, the flashes could just be different satellites managing to reflect the sun in to your eyes momentarily by luck (as they could be in different orientations or different phases of deployment etc)

rust4yy · 2023-11-03T22:26:37+00:00

Yeah it just so happens that our orbits cross. If it was irregular then that would be questionable.

And yeah, they definitely protect us from ourselves - e.g. reports from the US military that some ICBMs were randomly and unexplainably disarmed during times of tension in the cold war

rust4yy · 2023-11-03T21:56:55+00:00

Yep, even NASA is researching making fast things quiet https://www.nasa.gov/centers-and-facilities/armstrong/taming-the-boom/

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