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Sam Schlinkert @schlink@octodon.social

I wrote a #Rust script that is, as expected, taking some time and CPU resources. However I see that it's only using one of my 8 cores(?) (see screenshot).

If I were to use threads in Rust could I use more than one CPU? octodon.social/media/YxBLdEj5e

Patrick Marchand @mathuin

@schlink doc.rust-lang.org/book/second-

I do believe you have to make the program parallel by yourself, though there are probably wrappers over these lower-level constructs.

Sam Schlinkert @schlink@octodon.social

@mathuin right, yeah, for sure I knew I'd need to implement something code-wise. Just wanted to make sure Rust threads would be able to use more than one of my cores.

and re-wrapper, @carey sent me link to : github.com/rayon-rs/rayon

Haven't tried it yet though, but it looks really lightweight

Patrick Marchand @mathuin

@schlink @carey Yeah that's what I was actually looking for. I believe it's pretty efficient, I mean that's one of rust's main goals, zero-cost abstractions.

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Sam Schlinkert @schlink@octodon.social

@mathuin @carey

right -- my issue is that I wrote my big loop as a `for` loop (like `for word in word_list { do things }`). Can I just do

word_list.par_iter( |word|
do things
)

my code: github.com/sts10/half-entropy-

Sam Schlinkert @schlink@octodon.social

@carey @mathuin

ah, sorry. bet it's

words.par_iter().for_each(|word|
println!("Word is {}", word)
);

Patrick Marchand @mathuin

@schlink @carey My initial thought is that there would be no issue, but I've yet to do enough rust to be sure.

Carey @carey@mastodon.social

@mathuin @schlink That’s what I understand should work, too. Maybe even

for word in words.par_iter() {
println!(...)
}

noting that println! uses a mutex lock, so that specific example will probably get slower.

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