~ # /tmp/zramtest3.sh test6 /tmp/ffmpeg-1\:2.6.1-1-x86_64.pkg.tar
zram test6	 Sat Apr 4 09:50:06 GMT 2015

comp_algorithm	[lzo] lz4 snappy 
real		0m 0.20s	   0.20s	   0.24s        avg: 0.214s
real		0m 1.45s	   1.42s	   1.42s	avg: 1.430s
compr_data_size	30504972	30504968	30504947	   30504962


comp_algorithm	lzo [lz4] snappy 
real		0m 0.21s	   0.21s	   0.23s	avg: 0.217s
real		0m 1.36s	   1.36s	   1.33s	avg: 1.350s
compr_data_size	31234729	31234719	31234736	   31234728


comp_algorithm	lzo lz4 [snappy] 
real		0m 0.22s	   0.21s	   0.21s	avg: 0.214s
real		0m 1.56s	   1.59s	   1.56s	avg: 1.570s
compr_data_size	30931116	30931087	30931076	   30931093

Summary

Total average time
lzo:	1.644s
lz4:	1.567s
snappy:	1.784s

Average compr_data_size
lzo:	30504962
lz4:	31234728
snappy:	30931093


Gain
time= 4.7 % (lz4 vs lzo)
compression= 2.3% (lzo vs lz4)