comp-test.sh

#! /bin/bash
NBLOOP=3
COMPRESS_OBJECT=db/
 
memstats()
{
  (
  renice 19 $$ >/dev/null 2>&1
  while : ; do
    ps --no-headers -o rss -C $1 || break
    sleep 1
  done | tail -n 1
  )
}
bench()
{
  for i in $(seq 1 $NBLOOP) ; do
    trap "rm -f out.$2" EXIT
    /usr/bin/time -f "DONE: comp $1-$3 ($i) time: %e" tar cf out.$2 $COMPRESS_OBJECT --$1 2>&1 >/dev/null & sleep 1
    mem=$(memstats $1)
    size=$(stat -c '%s' out.$2)
    echo "... mem: $mem size: $size"
    echo
    mkdir tmp_extract_$$ || exit 1
    trap "rm -f out.$2 ; rm -Rf tmp_extract_$$" EXIT
    /usr/bin/time -f "DONE: decomp $1-$3 ($i) time: %e" tar xf out.$2 -C tmp_extract_$$ 2>&1 >/dev/null & sleep 1
    mem=$(memstats $1)
    echo "... mem: $mem"
    echo
    rm -f out.$2
    rm -Rf tmp_extract_$$
    trap - EXIT
  done
}
 
#for level in none ; do
#  echo "=== COMPRESS ==="
#  bench compress Z
#done
for level in 1 3 7 8 9 ; do
  echo "=== LZOP -$level ==="
  export LZOP="-$level"
  bench lzop lzo $level
done
for level in 1 2 3 4 5 6 7 8 9 ; do
  echo "=== GZIP -$level ==="
  export GZIP="-$level"
  bench gzip gz $level
done
for level in 1 2 3 4 5 6 7 8 9 ; do
  echo "=== BZIP2 -$level ==="
  export BZIP2="-$level"
  bench bzip2 bz2 $level
done
for level in 0 1 2 3 4 5 6 7 8 9 ; do
  echo "=== LZMA -$level ==="
  export XZ_OPT="-$level"
  bench lzma lzma $level
done
for level in 0 1 2 3 4 5 6 7 8 9 ; do
  echo "=== XZ (LZMA2) -$level ==="
  export XZ_OPT="-$level"
  bench xz xz $level
done