RE: sar has the correct information or the vmstat?

From: Hollis, Les <Les.Hollis_at_ps.net>
Date: Tue, 29 Mar 2005 18:18:31 -0600
Message-ID: <D44DCE7BBC084E4C9E2DA87EC75E8DE33E7A8D@pscdalpexch02.perotsystems.net>

In sar, it considers wio and idle separately. =20

Vmstat considers wio as idle time (because the CPU's are not working as they 'wait' for I/O)......and is rolled up in the id column

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Connor McDonald Sent: Tuesday, March 29, 2005 5:20 PM
To: oracle-l_at_freelists.org
Subject: Re: sar has the correct information or the vmstat?

I remember at a Sun presentation once the presenter remarked that "vmstat was the official tool
and 'sar' started life as a student project and should be treated as such".

I dunno if thats truth or fiction.

Cheers
Connor

• arun chakrapani rao <arunrao_oradba_at_yahoo.co.in> 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=20
  > 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
  > Sar 2 5000
  > 15:58:18 %usr %sys %wio %idle
  > 15:58:30 19 4 32 44
  > 15:58:32 14 4 22 61
  > 15:58:34 13 3 18 66
  > 15:58:36 14 4 26 56
  > 15:58:38 21 5 33 42
  >=20
  > Vmstat 2
  > us sy id
  > 12 4 84
  > 13 2 85
  > 18 4 78
  > 16 4 81
  > 13 3 84
  > 13 3 84
  > 20 5 74
  > 13 6 81
  >=20
  > Any help would be greatly appreciated.
  >=20
  > Thanks in advance
  >=20
  > Arun
  >=20
  >
  

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  >=20
  

Connor McDonald
Co-author: "Mastering Oracle PL/SQL - Practical Solutions" Co-author: "Oracle Insight - Tales of the OakTable"

web: http://www.oracledba.co.uk
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email: connor_mcdonald_at_yahoo.com

"GIVE a man a fish and he will eat for a day. But TEACH him how to fish, and...he will sit in a boat and drink beer all day"

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Received on Tue Mar 29 2005 - 19:19:48 CST