Re: sar has the correct information or the vmstat?

The difference is one of accounting - vmstat will count I/O wait time as idle, while sar will break it out separately. They're both right - technically time spent waiting on I/O isn't cpu time, but on the other hand, its not what people think of when they think of "idle" time either.

Matt

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Matthew Zito
GridApp Systems
Email: mzito_at_gridapp.com
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On Mar 29, 2005, at 1:04 PM, arun chakrapani rao wrote:



> Hi unix gurus

> which tool for checking the cpu utilization is

> reliable,

> is sar better or vmstat better on an hp box

> Please let me know

> I am working on an HP itanium server out here and i am

> seeing that both these tools show lots of difference

> i understand that sar gives out the io stats along

> with the idle stats.

> I am seeing here that idle time based on vmstat shows

> it is 80 to 90% where as the sar shows the idle time

> is 50 to 60%

> But the top and the glance shows similar to what the

> vmstat shows.

> Hence i am not sure which is correct.

> A small output is being show here


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