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IDS Forum

Re: optimum usage of resources

Posted By: Art Kagel
Date: Sunday, 8 August 2010, at 10:26 a.m.

In Response To: Re: optimum usage of resources (VINEET AGARWAL)

Try these settings and see how it goes. Separate from your CPU utilization
issue, do you have enough buffers? Calculate the Buffer Turnrover Rate
(BTR). The data you need are:

numbuf - number of buffers
stat_time - number of fractional hours since the last time the stats were
zero'd with onstat -z (or since startup if that's not been run since).

- Fractional hours: 6 minutes is 0.1 hour
pagread - from onstat -p
bufwrite - from onstat -p

The formula:

BTR = ((pagread + bufwrite) / numbuf) / stat_time = turnovers per hour

Ideally BTR should be less than 10 and is best maintained between 6 and 8.
If it is higher the indicates that you may need more buffers.

How many more? Hard to say. If you know the size of your working set of
data, use that value calculated into pages. Otherwise, there are two quick
and dirty methods I use:

1. Calculate the ratio between your calculated BTR and the desired one and
increase the number of buffers by that ratio.
2. Run onstat -P every 1-5 minutes for an hour or so saving the results into
separate files each time. Diff the files and identify partnums who's buffer
contents have increased or decreased by a significant amount (say more than
2% of the number of buffers). Add up the changes between each pair of files
and use the largest of these pair-wise diffs as the number of new buffers to
add.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
IIUG Board of Directors (art@iiug.org)

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
organization with which I am associated either explicitly, implicitly, or by
inference. Neither do those opinions reflect those of other individuals
affiliated with any entity with which I am affiliated nor those of the
entities themselves.

On Sat, Aug 7, 2010 at 1:03 AM, VINEET AGARWAL <
vineet.agarwal@samsonite.co.in> wrote:

> Does it mean that I need to increase NUMCPUVPS instead of NUMAIOVPS ?
>
> I have made the following changes in the ONCONFIG file to begin with :
>
> NUMAIOVPS (changed from 1 to 20)
> NUMCPUVPS (changed from 12 to 24)
> BUFFERS (changed from 52428 to 60000)
> CLEANERS ( changed from 1 to 40)
>
> I have other queries : like how to make IDS use more memory. (I have 16 GB)
>
> I have observed that it only uses 1 GB of memory. I does not add new memory
> segments ?
>
> Is the temp dbspace being utilized optimally ? how can i check it ?
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--e0cb4e887d1f09724f048d50b0fc

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