Suggest me best way to list io bounded process. I know iotop is best way to get list but want any alternate option since my system showing a large number of D state process.

2 Answers 2


Duplicated of: Linux - How can I see what's waiting for disk IO see that URL for a simple solution.

And you can enable disk I/O logging putting 1 into /proc/sys/vm/block_dump. then tail -f /var/log/syslog will give you reads and writes (process, pid, operation, blocks and device). Do not forget to return /proc/sys/vm/block_dump to zero when you're done.

  • It's the kern.log and/or debug file on Debian based distributions.
    – fab
    Commented Apr 18, 2011 at 8:48

You can check the IO usage of any process by looking at the /proc/[pid]/io file. Example:

$ cat /proc/1775/io
read_bytes: 4366336
write_bytes: 45056
cancelled_write_bytes: 229376
  • 2
    iotop now requires NET_ADMIN capability (or sudo/root) to be run, so this is a great alternative than using setcap cap_net_admin+ep /usr/sbin/iotop I guess.. thx!! Commented Jul 4, 2013 at 22:16
  • 4
    You must actually set the cap_net_admin on python for this to work. setcap cap_net_admin+ep /usr/bin/python2.7 for example.
    – gam3
    Commented Aug 22, 2014 at 11:42

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