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niklas-heer / speed-comparison

A repo which compares the speed of different programming languages.
https://niklas-heer.github.io/speed-comparison
MIT License
475 stars 76 forks source link

faster fortran code #58

Closed francescoalemanno closed 1 year ago

francescoalemanno commented 1 year ago

it still evaluates all the terms, one by one. But it does so in a way that should lead to vector assembly code

niklas-heer commented 1 year ago

@francescoalemanno thank you for your contribution! :)

francescoalemanno commented 1 year ago

@niklas-heer actually it was a bit too rush to close this pull-request before checking that it actually worked... On my laptop it made the code run ~ 3 times as fast:

(base) ➜  hyperfine ./leibniz_orig
Benchmark 1: ./leibniz_orig
  Time (mean ± σ):      95.9 ms ±   0.7 ms    [User: 95.0 ms, System: 0.6 ms]
  Range (min … max):    95.4 ms …  98.9 ms    30 runs

(base) ➜  hyperfine ./leibniz                                                               
Benchmark 1: ./leibniz
  Time (mean ± σ):      32.7 ms ±   0.4 ms    [User: 32.1 ms, System: 0.3 ms]
  Range (min … max):    32.3 ms …  34.7 ms    82 runs

but this does not show up in the CI runs... I wanted to investigate why... Okay I guess