01results.txt

Going to run:  find /usr -name "*c*" -type f -exec cat {} \; | wc -l
  0.23s user 0.91s system 17% cpu 6.468 total
  0.34s user 0.87s system 18% cpu 6.659 total
  0.27s user 0.87s system 17% cpu 6.527 total
  0.31s user 0.89s system 17% cpu 6.777 total
  0.29s user 0.96s system 17% cpu 6.928 total

Going to run:  find /usr -name "*c*" -type f -exec cat {} + | wc -l
  0.14s user 0.32s system 95% cpu 0.484 total
  0.14s user 0.20s system 94% cpu 0.360 total
  0.12s user 0.23s system 93% cpu 0.371 total
  0.10s user 0.22s system 86% cpu 0.361 total
  0.15s user 0.17s system 93% cpu 0.345 total

Going to run:  find /usr -name "*c*" -type f -print0 | xargs -0 cat | wc -l
  0.13s user 0.20s system 93% cpu 0.355 total
  0.13s user 0.19s system 92% cpu 0.346 total
  0.15s user 0.20s system 93% cpu 0.372 total
  0.14s user 0.19s system 94% cpu 0.355 total
  0.15s user 0.18s system 92% cpu 0.358 total

Going to run:  for i in /usr/**/*c*(.) ; do cat $i; done | wc -l
  0.12s user 0.06s system 1% cpu 9.121 total
  0.11s user 0.06s system 1% cpu 9.267 total
  0.08s user 0.10s system 1% cpu 9.554 total
  0.08s user 0.09s system 1% cpu 9.236 total
  0.10s user 0.08s system 1% cpu 9.692 total

perf.sh

#!/usr/bin/zsh

SHELL=/usr/bin/zsh


do_perf () {
    printf "Going to run:  %s\n" "$1"
    for i in {1..5}; do
        # To check that all versions do the same thing,
        # remove the '>/dev/null'.
        time $SHELL -c "$1" >/dev/null
    done
    printf "\n"
}

# cache stuff:
find /usr -name "*c*" -exec cat {} \; >/dev/null 2>&1

printf "\n"
do_perf 'find /usr -name "*c*" -type f -exec cat {} \; | wc -l'
do_perf 'find /usr -name "*c*" -type f -exec cat {} + | wc -l'
do_perf 'find /usr -name "*c*" -type f -print0 | xargs -0 cat | wc -l'
do_perf 'for i in /usr/**/*c*(.) ; do cat $i; done | wc -l'
printf "\n"