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 1.41 times faster when the path cache is enabled (this is enabled by default)
• rust-parallel is 1.63 times faster than xargs with 8 processes. Note that this use of xargs does not prevent output interleaving.
• rust-parallel is 13.24 times faster than GNU parallel

Versions

$ rust-parallel -V
rust-parallel 1.8.0

$ parallel -V
GNU parallel 20230722

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):     149.6 ms ±   0.8 ms    [User: 224.8 ms, System: 742.9 ms]
  Range (min … max):   148.2 ms … 151.4 ms    19 runs

Benchmark 2: seq 1 1000 | rust-parallel --disable-path-cache echo
  Time (mean ± σ):     211.2 ms ±   1.0 ms    [User: 253.3 ms, System: 988.8 ms]
  Range (min … max):   209.8 ms … 213.0 ms    14 runs

Benchmark 3: seq 1 1000 | xargs -P8 -L1 echo
  Time (mean ± σ):     243.5 ms ±   0.9 ms    [User: 145.9 ms, System: 543.7 ms]
  Range (min … max):   242.0 ms … 245.2 ms    12 runs

Benchmark 4: seq 1 1000 | parallel echo
  Time (mean ± σ):      1.981 s ±  0.014 s    [User: 2.440 s, System: 3.571 s]
  Range (min … max):    1.961 s …  2.009 s    10 runs

Summary
  seq 1 1000 | rust-parallel echo ran
    1.41 ± 0.01 times faster than seq 1 1000 | rust-parallel --disable-path-cache echo
    1.63 ± 0.01 times faster than seq 1 1000 | xargs -P8 -L1 echo
   13.24 ± 0.12 times faster than seq 1 1000 | parallel echo