Benchmarks

Test System

• 15-inch Macbook Air M2, 2023 (my personal laptop)
• rust-parallel uses 8 parallel jobs by default on this machine
• MacOS 14.2.1

Test Setup

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

Summary

• rust-parallel is 1.37 times faster when the path cache is enabled (this is enabled by default)
• rust-parallel is 2.10 times faster than xargs with 8 processes. Note that this use of xargs does not prevent output interleaving.
• rust-parallel is 11.95 times faster than GNU parallel

Versions

$ rust-parallel -V
rust-parallel 1.15.0

$ parallel -V
GNU parallel 20240122

Results

Benchmark 1: seq 1 1000 | rust-parallel echo
  Time (mean ± σ):     162.2 ms ±   0.7 ms    [User: 216.2 ms, System: 586.2 ms]
  Range (min … max):   160.4 ms … 163.7 ms    18 runs

Benchmark 2: seq 1 1000 | rust-parallel --disable-path-cache echo
  Time (mean ± σ):     222.1 ms ±   1.2 ms    [User: 257.1 ms, System: 849.6 ms]
  Range (min … max):   220.1 ms … 223.9 ms    13 runs

Benchmark 3: seq 1 1000 | xargs -P8 -L1 echo
  Time (mean ± σ):     340.7 ms ±   2.0 ms    [User: 153.6 ms, System: 511.8 ms]
  Range (min … max):   337.2 ms … 345.0 ms    10 runs

Benchmark 4: seq 1 1000 | parallel echo
  Time (mean ± σ):      1.938 s ±  0.007 s    [User: 2.535 s, System: 3.517 s]
  Range (min … max):    1.920 s …  1.946 s    10 runs

Summary
  seq 1 1000 | rust-parallel echo ran
    1.37 ± 0.01 times faster than seq 1 1000 | rust-parallel --disable-path-cache echo
    2.10 ± 0.02 times faster than seq 1 1000 | xargs -P8 -L1 echo
   11.95 ± 0.07 times faster than seq 1 1000 | parallel echo