build/stress-disk

   1 #!/bin/bash
   2
   3 d=hda
   4 blocks_at_a_time=1000
   5 readers=2
   6
   7 set -x
   8 ds=`cat /sys/block/$d/size`
   9 ds=$((ds/blocks_at_a_time))
  10
  11 for i in `seq 0 $((readers-1))`; do
  12         ( while true; do dd if=/dev/$d of=/dev/null bs=$((512*blocks_at_a_time)) skip=$((ds/readers*i)) count=$((ds/readers)); done ) &
  13         pids="$pids $!"
  14 done
  15
  16 trap "kill $pids; killall dd" EXIT
  17
  18 wait