zram benchmark

zram_combined_benchmark

~ # /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)

zram_write_benchmark

~ # /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)

zramtest3.sh

#!/sbin/sh

sys_zram="/sys/block/zram0"
zram="/dev/block/zram0"
disksize="$((50*1024*1024))"
mnt_point="zram0mnt"

TEST_1="cp -f $2 /${mnt_point}"

reset(){
echo 1 > ${sys_zram}/reset
sleep 2
}

init_disk(){
mkdir -p ${mnt_point}
echo ${disksize} > ${sys_zram}/disksize
mke2fs -t ext4 -m 0 -I 128 -O ^has_journal,^ext_attr ${zram} >& /dev/null
mount -o noatime,barrier=0,data=writeback,nobh,discard ${zram} ${mnt_point}
cd ${mnt_point}
}

case $1 in
test1)
  	TEST="time tar xJf $2"
  	;;
test2)
  	TEST="time tar xf $2"
	;;
test3)
	TEST="time cp $2 ."
	;;
test4)
	TEST="${TEST_1}"
	TEST_2="time cp -rf /${mnt_point}/ /tmp/"
	;;
test5)
	TEST="${TEST_1}"
	TEST_2="time tar -xf /${mnt_point}/*.tar -C /tmp/"
	;;
test6)
	TEST="time ${TEST_1}"
	TEST_2="time tar -xf /${mnt_point}/*.tar"
	;;
*)
	exit
	;;
esac


benchmark(){
init_disk
${TEST} && ${TEST_2}
	sync
	sleep 5
	echo 3 > /proc/sys/vm/drop_caches
	sleep 5
if [ "$1" \< "test3" ] | [ "$1" = "test6" ]; then
	echo -ne "orig_data_size\t" | cat - ${sys_zram}/orig_data_size
	echo -ne "compr_data_size\t" | cat - ${sys_zram}/compr_data_size
	echo -ne "mem_used_total\t" | cat - ${sys_zram}/mem_used_total
fi
cd ..
umount ${mnt_point}
reset
echo ""
}

streams_test(){
if [ -e ${sys_zram}/max_comp_streams ] && [ -n "$2" ] && [ "$2" != 0 ]; then
	for i in $(seq 1 $2)
	do
		echo $i > ${sys_zram}/max_comp_streams
		echo -ne "max_comp_streams\t" | cat - ${sys_zram}/max_comp_streams
		benchmark $1
	done
else
	benchmark $1
fi
}

comp_algorithm(){
for c in $(cat ${sys_zram}/comp_algorithm | sed -e s#'\['#''#g -e s#'\]'#''#g)
do
	echo $c > ${sys_zram}/comp_algorithm
	echo -ne "\ncomp_algorithm\t" | cat - ${sys_zram}/comp_algorithm
	streams_test $1 $2
done
}

echo -e "zram $1\t" $(date)
reset
if [ -e ${sys_zram}/comp_algorithm ]; then
	comp_algorithm $1 $3
else
	streams_test $1 $3
fi