RE: CPU WAIT I/O statistic

From: Pablo Rodriguez <p_rodri99_at_yahoo.es>
Date: Tue, 15 Oct 2002 11:18:57 -0800
Message-ID: <F001.004E9B35.20021015111857@fatcity.com>

Dennis,

    Thanks for your answers and your time.

    I was interested in how the OS (Sun, AIX, HP, etc) classifies the CPU time used by the processes.

    Taking a look at the WAIT I/O statistic taken with sar -u I started wondering what they really meant:

ie
%usr %sys %wio %idl
30 5 60 5

Does 60% (WIO column) mean that the processes actually used 60 percent of the CPU time (while they were waiting for I/O) ? If this is the correct answer, How did the consume this time?

OR

May be this means that the I/O primitives (kaio, pwrite, write..) used the 60% of the CPU time...

OR

it simple means that 60% of the processes that were executed have incurred in an I/O....

I Hope someone can shed some light on this. Thanks.     

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Author: =?iso-8859-1?q?Pablo=20Rodriguez?=   INET: p_rodri99_at_yahoo.es

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