decompression_benchmark.sh - Decompression Benchmark

decompression_bench.sh

#!/usr/bin/env bash

if (( $# != 2 )); then
  cat <<-EOD
	Usage: ${0##*/} <count> <file>
	  Decompression benchmark
	EOD
  exit
fi

if ! let n="$1"; then
  echo "Error: can't parse count: $1"
  exit 1
fi
ext=".${2##*.}"
if [ "$2" = "$ext" ]; then
  echo "Error: can not detect filename extension: $2"
  exit 1
fi
file="$2"

case "$ext" in
  .gz)  dec=( gzip  -dc );;
  .bz2) dec=( bzip2 -dc );;
  .xz)  dec=( xz    -dc );;
  .zst) dec=( zstd  -dc );;
  *)
    echo "Error: unsupported compression format: $ext"
    exit 1
    ;;
esac

let size=$(stat -c %s "$file")

ls -l --time-style="+%F %T" "$file"
{
  time for i in $(seq 1 $n); do
    "${dec[@]}" "$file" >/dev/null
  done
} |& gawk -vn=$n -vsize=$size '
  function tosec(s) {return match(s, /([0-9]+)m([.0-9]+)s/,m) ? m[1]*60+m[2] : 0}
  /^(real|user|sys)/ {$2=tosec($2); mb = size * n / 1000000.0; printf("\t%-4s %5.1fMB, %6.3fs, %6.1fMB/s, %6.3fs/MB\n", $1, mb, $2, mb / $2, $2 / mb);}
'