I'm trying to measure the total amount of disk writing and reading that is done to a particular volume by a particular process over a specified duration.
I've found iotop, which can output IO every second for a particular process like this:
iotop --batch --pid $(pidof my_process)
Where you can specify x iterations with -n x
.
But then I have to filter out the actual number, and tally it up myself.
Is there an easier way to do this?
Best Answer
Don't know of an easier way off hand, but this bash snippet might help you with parsing out what you need from iotop:
Actually, Might be easier to read /proc/$PID/io every x seconds:
Actually, looks like the above script is wrong, because it seems like
/proc/<pid>/io
is just the total, so really, just grab it once, wait however long, grab it again, find the differnce and there is your answer. You might want to look at the source code and find out its data type to see if it eventually wraps around. Probably not a problem for a little tablet though.