Hacker News Reader

Comment by makapuf | Hacker News Reader

Interested by your rust speed approaches, care to share a link ?

Same. I am doing rust + clojure this year. Very interested in performance hax, esp around SIMD. I know absolutely nothing at all about rust, this is my first time working with it.

My day 1 rust solution:

    cargo solve 1 --
    release
        Finished `release` profile [optimized] target(s) in 0.05s
        Running `target/release/01`
    Part 1: 1189304 (95.8µs)
    Part 2: 24349736 (120.4µs)

Day 1 clojure solution:

      lein run 1
      running all tasks for day 1
      reading input from resources/day01.txt
      running day 1 part 1
         part-fn: #'aoc.day-01/part-1
         took: 5.511375 ms
         result: 1189304
      reading input from resources/day01.txt
      running day 1 part 2
         part-fn: #'aoc.day-01/part-2
         took: 1.822334 ms
         result: 243497365

Code here: https://github.com/whalesalad/aoc

There's a Rust solution posted in the Reddit Day 1 answers mega thread which claims 22 microseconds part 1 and 10 microseconds part 2. (I haven't tried to verify):

https://old.reddit.com/r/adventofcode/comments/1h3vp6n/2024_...

Sure but how long did it take to compile

I 'git clone' and 'cargo run' and it downloaded 16 crates and compiled all the crates and built a debug version in 29.7 seconds.

Then 'cargo build --release' took 23.3 seconds.

Commenting out one of the sort_unstable lines and rebuilding gave me a warning, recompiled in 1.8 seconds.

Can't edit my comment, here's another claiming 12.7 μs and 7 μs:

https://old.reddit.com/r/adventofcode/comments/1h3vp6n/2024_...

Another claiming 30μs and 32μs:

https://old.reddit.com/r/adventofcode/comments/1h3vp6n/2024_...

For an interesting comparison, here's BQN, an array language, at 25.5μs (on an i3-4160) for both parts, including input parsing:

https://github.com/dzaima/aoc/blob/master/2024/BQN/1_fast.bq...

That's very impressive.

Are the timings with language runtime startup, or only the procedure calls of the actual code?

Just the individual part1 and part2 functions. At least on the Clojure side, I made the runner. For the rust side I’m not sure I’m using a template project that does that containment.

I do AoC first time and use it to try a functional LISP like language (Clojure).

Though it is just a beginning and maybe it is a matter of habit,but I should say, that reading LISP family language is so difficult for my brain.

It takes a while. But if you continue to practice, it will eventually click.

Reply on news.ycombinator.com