compression/README.md

compression ratio

	gzip	bzip2	xz	xz -e	lz4	lzma	snzip
0			80.73%	84.61%		84.92%
1	74.5%	81.05%	82.81%	85.59%	67.19%	86.46%	66.25%
2	75.7%	82.38%	83.66%	85.97%	67.19%
3	76.6%	82.98%	84.09%	86.25%	75.22%
4	78.3%	83.35%	84.86%	86.26%	75.65%
5	79.2%	83.62%	86.06%	86.47%	75.89%
6	79.6%	83.81%	86.38%	86.47%	76.01%
7	79.7%	83.97%	86.56%	86.67%	76.07%
8	79.8%	84.08%	86.74%	86.84%	76.10%
9	79.8%	84.19%	86.88%	86.99%	76.11%

compression time

	gzip	bzip2	xz	xz -e	lz4	lzma	snzip
0			50.60s	333.05s		288.73s
1	10.34s	74.76s	50.79s	360.19s	3.22s	455.00s	2.96s
2	11.39s	74.39s	64.31s	390.78s	3.37s
3	13.33s	75.44s	99.85s	398.39s	11.16s
4	16.14s	76.58s	178.79s	434.64s	13.04s
5	21.01s	77.44s	301.12s	437.66s	15.75s
6	28.47s	77.96s	370.80s	497.70s	18.74s
7	33.82s	77.96s	417.60s	561.10s	22.26s
8	45.66s	78.74s	473.67s	624.27s	25.93s
9	51.07s	79.18s	536.60s	694.36s	29.18s

decompression time

	gzip	bzip2	xz	xz -e	lz4	lzma	snzip
0			16.09s	13.22s		8.00s
1	4.76s		13.90s	12.05s	1.89s	7.90s	1.94s
2	4.52s		12.94s	11.65s	1.93s
3	4.55s		12.40s	11.54s	1.82s
4	4.44s		12.24s	11.80s	1.81s
5	4.38s		11.59s	11.37s	1.80s
6	4.28s		11.47s	11.27s	1.73s
7	4.17s		11.44s	11.28s	1.66s
8	4.26s		11.42s	11.36s	1.81s
9	4.26s		11.65s	11.38s	1.72s

Test Environment

Software used in this test (version strings):

• gzip :FreeBSD gzip 20150413
• bzip2: Version 1.0.6, 6-Sept-2010
• xz: xz (XZ Utils) 5.2.2 , liblzma 5.2.2
• lz4: v1.7.5
• lzma: 9.22 beta
• snzip: 1.0.4

Hardware:

# sysctl hw.model hw.machine_arch hw.realmem hw.clockrate
hw.model: Intel(R) Xeon(R) CPU E5-4620 0 @ 2.20GHz
hw.machine_arch: amd64
hw.realmem: 34359738368
hw.clockrate: 2200

OS:

# uname -rsmK
FreeBSD 11.0-STABLE amd64 1100506