Linux/Compression tools

benchmark

• Compressing 6144MB kvm image (RAW, MB used)

Command	Arguments	compressed size [MB]	time [s]	additional size [MB]
pigz	--best	1526	259.65	533
pigz	--fast	1667	28.06	674
cat	> target	6144	60.80
copy		6144	59.36
7z	a -t7z -mx1 -si	1333	359.66	340
7z	a -t7z -mx9 -si	993	1360.15	0
7z	a -m0=lzma2 -si	1137	551.40	144
7z	a -mx9 -m0=lzma2 -si	1006	788	13

• benchmark script

#!/bin/bash
COMPRESSCMD="pigz -9"
DESC="pigz-best"

START=$(date +%s.%N)
cat image.img | $COMPRESSCMD > /backup/$DESC.img.gz
END=$(date +%s.%N)
DIFF=$(echo "$END - $START" | bc)
echo "$DIFF" > /backup/$DESC.log