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I have a process of I would like to monitor the i/o with some precision. I know the PID, but I can't really control the way it is started (so I can't really put a pv-like command in between). What I would like to get is this list (or something that can be parsed as it):

filename bytes_read bytes_write

bla.dat 332244 342344223

bli.dat 22222 20498377


What I found out is that I can get the file handles and the total number of read/written bytes from the /rpoc folder (/proc/1234/fd/ and /proc/1234/io respectively) so the only thing I would need is the coupling of the file descriptor to the amount of data written/read from/to that file.

Is there a way to get this?

share|improve this question
Consider iotop for per-process IO. It has an accumulating mode, and a batch mode, so it's flexible for interactive use and logging. I do not believe it will break down IO per file being accessed by a process, however. – Chris Betti Oct 3 '13 at 19:45
I'll def try iotop anyway. I have seen many people being enthousiastic about it. – Hazkan Oct 4 '13 at 7:28

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