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 1.64 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 1.7.1

$ 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):     150.3 ms ±   1.2 ms    [User: 226.3 ms, System: 748.3 ms]
  Range (min … max):   148.4 ms … 152.3 ms    19 runs

Benchmark 2: seq 1 1000 | rust-parallel --disable-path-cache echo
  Time (mean ± σ):     213.2 ms ±   1.0 ms    [User: 254.2 ms, System: 995.0 ms]
  Range (min … max):   212.0 ms … 215.1 ms    13 runs

Benchmark 3: seq 1 1000 | xargs -P8 -L1 echo
  Time (mean ± σ):     246.7 ms ±   1.6 ms    [User: 146.4 ms, System: 550.2 ms]
  Range (min … max):   244.5 ms … 249.2 ms    12 runs

Benchmark 4: seq 1 1000 | parallel echo
  Time (mean ± σ):      1.991 s ±  0.014 s    [User: 2.441 s, System: 3.589 s]
  Range (min … max):    1.968 s …  2.011 s    10 runs

Summary
  seq 1 1000 | rust-parallel echo ran
    1.42 ± 0.01 times faster than seq 1 1000 | rust-parallel --disable-path-cache echo
    1.64 ± 0.02 times faster than seq 1 1000 | xargs -P8 -L1 echo
   13.24 ± 0.14 times faster than seq 1 1000 | parallel echo