Benchmarks

Test System

• 15-inch Macbook Air M2, 2023 (my personal laptop)
• rust-parallel uses 8 parallel jobs by default on this machine
• MacOS 26.6.1

Test Setup

• Run 100 echo commands on strings 1 to 100
• Benchmarks use hyperfine testing tool
• Link to benchmark script

Summary

• rust-parallel is 11.68 times faster than GNU parallel
• rust-parallel is 1.73 times faster than xargs with 8 processes. Note that this use of xargs does not prevent output interleaving.

Versions

$ rust-parallel -V
rust-parallel 1.24.0

$ parallel -V
GNU parallel 20260722

Results

Benchmark 1: seq 1 100 | rust-parallel echo
  Time (mean ± σ):      28.4 ms ±   0.8 ms    [User: 68.4 ms, System: 94.2 ms]
  Range (min … max):    26.9 ms …  31.2 ms    91 runs

Benchmark 2: seq 1 100 | xargs -P8 -L1 echo
  Time (mean ± σ):      49.0 ms ±   1.0 ms    [User: 50.9 ms, System: 87.9 ms]
  Range (min … max):    47.1 ms …  52.3 ms    56 runs

Benchmark 3: seq 1 100 | parallel echo
  Time (mean ± σ):     331.6 ms ±   0.8 ms    [User: 376.7 ms, System: 429.0 ms]
  Range (min … max):   329.9 ms … 332.8 ms    10 runs

Summary
  seq 1 100 | rust-parallel echo ran
    1.73 ± 0.06 times faster than seq 1 100 | xargs -P8 -L1 echo
   11.68 ± 0.33 times faster than seq 1 100 | parallel echo