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zram 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)
~ # /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)
#!/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
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