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Accepted
Anthony Miller
Asked: 2014-07-31 02:20:31 +0800 CST

Find process causing IO wait time

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mpstat -P ALL shows high %wa time on a single core from an 8 core CPU and I'm trying to figure out what's writing to disk. So how can I figure out what is running on that CPU core?

linux

2 Answers

  1. PSR column in output of :

    ps -eLF

    will show you PIDs on each core.

    • 11
  2. Best Answer
    • Run iotop and will show processes writing on disk.

    Press a in it to top the most greedy process.

    enter image description here

    • lsof The following will return a list of all files that are open for writing:**

    lsof | grep -e "[[:digit:]]\+w"

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