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 1.65 times faster than xargs with 8 processes
• rust-parallel is 13.36 times faster than GNU parallel

Versions

$ rust-parallel -V
rust-parallel 1.5.1

$ 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):     149.9 ms ±   1.0 ms    [User: 226.4 ms, System: 742.1 ms]
  Range (min … max):   148.3 ms … 151.6 ms    19 runs

Benchmark 2: seq 1 1000 | rust-parallel --disable-path-cache echo
  Time (mean ± σ):     212.3 ms ±   1.9 ms    [User: 255.1 ms, System: 977.1 ms]
  Range (min … max):   208.8 ms … 215.5 ms    14 runs

Benchmark 3: seq 1 1000 | xargs -P8 -L1 echo
  Time (mean ± σ):     247.1 ms ±   1.3 ms    [User: 146.6 ms, System: 548.2 ms]
  Range (min … max):   245.1 ms … 249.5 ms    12 runs

Benchmark 4: seq 1 1000 | parallel echo
  Time (mean ± σ):      2.003 s ±  0.011 s    [User: 2.450 s, System: 3.591 s]
  Range (min … max):    1.987 s …  2.018 s    10 runs

Summary
  seq 1 1000 | rust-parallel echo ran
    1.42 ± 0.02 times faster than seq 1 1000 | rust-parallel --disable-path-cache echo
    1.65 ± 0.01 times faster than seq 1 1000 | xargs -P8 -L1 echo
   13.36 ± 0.12 times faster than seq 1 1000 | parallel echo