Re: Page faults with physical i/o

From: Alex Rousskov (rousskov@measurement-factory.com)
Date: Thu Apr 25 2002 - 13:36:15 MDT


On Thu, 25 Apr 2002, Nguyen Thi Le Chau wrote:

> Can anyone explain me what it is about and why it happens when
> using polygraph ? I got it while running almost of the tests
> (sample tests provided with polygraph).

Page faults with physical I/O mean different things on different
operating systems. On some, it is an indication of process swapping
from or to disk. On others, it is an indication of virtually any disk
I/O (e.g., logging) taking place. You may want to consult your OS
documentation to find out what it means in your environment.

You can ignore this OS-level statistics unless you have other problems
that may indicate that your Polygraph processes are running out of
memory and swapping out.

Alex.



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