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 1.45 times faster when the path cache is enabled (this is enabled by default)
• rust-parallel is 1.60 times faster than xargs with 8 processes. Note that this use of xargs does not prevent output interleaving.
• rust-parallel is 12.87 times faster than GNU parallel

Versions

$ rust-parallel -V
rust-parallel 1.9.0

$ 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):     154.3 ms ±   0.9 ms    [User: 225.9 ms, System: 773.6 ms]
  Range (min … max):   152.9 ms … 155.8 ms    19 runs

Benchmark 2: seq 1 1000 | rust-parallel --disable-path-cache echo
  Time (mean ± σ):     224.3 ms ±   1.5 ms    [User: 254.4 ms, System: 1061.7 ms]
  Range (min … max):   222.3 ms … 227.8 ms    13 runs

Benchmark 3: seq 1 1000 | xargs -P8 -L1 echo
  Time (mean ± σ):     246.9 ms ±   1.5 ms    [User: 146.4 ms, System: 548.1 ms]
  Range (min … max):   243.7 ms … 248.5 ms    12 runs

Benchmark 4: seq 1 1000 | parallel echo
  Time (mean ± σ):      1.987 s ±  0.012 s    [User: 2.444 s, System: 3.582 s]
  Range (min … max):    1.968 s …  2.016 s    10 runs

Summary
  seq 1 1000 | rust-parallel echo ran
    1.45 ± 0.01 times faster than seq 1 1000 | rust-parallel --disable-path-cache echo
    1.60 ± 0.01 times faster than seq 1 1000 | xargs -P8 -L1 echo
   12.87 ± 0.11 times faster than seq 1 1000 | parallel echo