Measure io versus blkio.weight

#!/bin/bash
set -e
set -x

runs=$(seq 100 200 1000)
dir=/var/vcap/data

echo cfq > /sys/block/sda/queue/scheduler

#create files, need different files not to share cached one
for i in $runs; do
        echo $i > /sys/fs/cgroup/blkio/test$i/blkio.weight
        cat  /sys/fs/cgroup/blkio/test$i/blkio.weight
done

#create cgroups blkio directories
for i in $runs; do
        mkdir -p /sys/fs/cgroup/blkio/test$i
done

#write part
for i in $runs; do
        dd if=/dev/zero of=$dir/file$i bs=512M count=1
        #dd if=/dev/zero of=$dir/file$i bs=512M count=1 >>/tmp/write-output 2>&1 &
        #echo $! > /sys/fs/cgroup/blkio/test$i/tasks
        #cat /sys/fs/cgroup/blkio/test$i/tasks
done
#exit


#clean files from caches
sync
echo 3 > /proc/sys/vm/drop_caches


#read part
for i in $runs; do
        dd if=$dir/file$i of=/dev/null >>/tmp/read-output 2>&1 &
        echo $! > /sys/fs/cgroup/blkio/test$i/tasks
        cat /sys/fs/cgroup/blkio/test$i/tasks
done