Benchmarks

Test System

• 15-inch Macbook Air M2, 2023 (my personal laptop)
• rust-parallel uses 8 parallel jobs by default on this machine
• MacOS 13.4.1

Test Setup

• Run echo on 1000 strings 1 to 1000
• Benchmarks run using hyperfine testing tool
• Link to benchmark script

Summary

• rust-parallel is 1.42 times faster when the path cache is enabled (this is enabled by default)
• rust-parallel is 1.64 times faster than xargs with 8 processes
• rust-parallel is 13.30 times faster than GNU parallel

Versions

$ rust-parallel -V
rust-parallel 1.5.0

$ parallel -V
GNU parallel 20230622

Results

$ hyperfine --warmup 3 \
  'seq 1 1000 | rust-parallel echo' \
  'seq 1 1000 | rust-parallel --disable-path-cache echo' \
  'seq 1 1000 | xargs -P8 -L1 echo' \
  'seq 1 1000 | parallel echo'

Benchmark 1: seq 1 1000 | rust-parallel echo
  Time (mean ± σ):     148.5 ms ±   0.6 ms    [User: 225.4 ms, System: 736.6 ms]
  Range (min … max):   146.9 ms … 149.5 ms    19 runs

Benchmark 2: seq 1 1000 | rust-parallel --disable-path-cache echo
  Time (mean ± σ):     210.5 ms ±   1.0 ms    [User: 252.7 ms, System: 978.4 ms]
  Range (min … max):   209.2 ms … 212.3 ms    14 runs

Benchmark 3: seq 1 1000 | xargs -P8 -L1 echo
  Time (mean ± σ):     244.2 ms ±   0.8 ms    [User: 146.7 ms, System: 543.2 ms]
  Range (min … max):   243.1 ms … 245.6 ms    12 runs

Benchmark 4: seq 1 1000 | parallel echo
  Time (mean ± σ):      1.975 s ±  0.018 s    [User: 2.441 s, System: 3.567 s]
  Range (min … max):    1.956 s …  2.018 s    10 runs

Summary
  seq 1 1000 | rust-parallel echo ran
    1.42 ± 0.01 times faster than seq 1 1000 | rust-parallel --disable-path-cache echo
    1.64 ± 0.01 times faster than seq 1 1000 | xargs -P8 -L1 echo
   13.30 ± 0.13 times faster than seq 1 1000 | parallel echo