Benchmarks

Test System

• 15-inch Macbook Air M2, 2023 (my personal laptop)
• rust-parallel uses 8 parallel jobs by default on this machine
• MacOS 13.5

Test Setup

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

Summary

• rust-parallel is 1.43 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. Note that this use of xargs does not prevent output interleaving.
• rust-parallel is 13.41 times faster than GNU parallel

Versions

$ rust-parallel -V
rust-parallel 1.8.2

$ parallel -V
GNU parallel 20230822

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):     148.9 ms ±   0.7 ms    [User: 226.4 ms, System: 746.2 ms]
  Range (min … max):   147.6 ms … 150.4 ms    19 runs

Benchmark 2: seq 1 1000 | rust-parallel --disable-path-cache echo
  Time (mean ± σ):     212.7 ms ±   2.0 ms    [User: 254.1 ms, System: 991.4 ms]
  Range (min … max):   210.0 ms … 218.2 ms    14 runs

Benchmark 3: seq 1 1000 | xargs -P8 -L1 echo
  Time (mean ± σ):     245.5 ms ±   1.4 ms    [User: 145.8 ms, System: 550.2 ms]
  Range (min … max):   242.7 ms … 247.1 ms    12 runs

Benchmark 4: seq 1 1000 | parallel echo
  Time (mean ± σ):      1.998 s ±  0.007 s    [User: 2.443 s, System: 3.599 s]
  Range (min … max):    1.986 s …  2.009 s    10 runs

Summary
  seq 1 1000 | rust-parallel echo ran
    1.43 ± 0.01 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
   13.41 ± 0.08 times faster than seq 1 1000 | parallel echo