Comment by bee_rider

Comment by bee_rider 10 months ago

7 replies

View on Hacker News

Out of curiosity, how do Spice/Chili/Rayon compare against the boring answer, OpenMP?

I guess they must have some really neat capabilities.

marmaduke 10 months ago

That’s what I was wondering. Iiuc openmp uses work stealing and the spice readme talks about the inefficiency of that:

https://github.com/judofyr/spice?tab=readme-ov-file#work-ste...

so I’d be interested in seeing a benchmark.

Reply View 3 replies

jgtrosh 10 months ago

Does OpenMP support work stealing? https://stackoverflow.com/a/36407220
Answer: it's just an interface.
Other implementations go as far as targetting GPU https://www.openmp.org/updates/openmp-accelerator-support-gp...
Could you implement OpenMP using Spice/Chili? Good question?

Reply View | 0 replies
marmaduke 10 months ago

Reading the implementation details kinda got me wanting to do a c11 threads based port.

Reply View | 0 replies
bee_rider 10 months ago

Thanks. That’s some pretty clever stuff, with a nice intuitive description.

Reply View | 0 replies

nestorD 10 months ago

Rayon is known to have a higher overhead for the simple, and arguably most common case in numerical codes, static block size scheduling. Things get better, and you start to benefit from rayon, as work gets less balanced.

Reply View 0 replies

thayne 10 months ago

Well, for one thing OpenMP is a c/c++ library, and chili and rayon are rust libraries.

It's probably possible to use openmp from rust, but the interface probably isn't as nice, you would need some kind of translation layer from rust closures and iterators to the OpenMP API

Reply View 1 reply

bee_rider 10 months ago

Plus Fortran!
There’d definitely be some work translating Rust concepts over. It might be impossible/not worth it. But maybe it would be nice to have Rust, C, and Fortran all talking to the same runtime?

Reply View | 0 replies