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IDS Forum

Re: A question of load . . .

Posted By: Keith Simmons
Date: Friday, 1 September 2006, at 5:39 a.m.

In Response To: Re: A question of load . . . (Chris Salch)

Chris

90000 buffers on a 2K page size O/S means 180 Mb of buffer space! With
5Gb memory, even with what else is happening on the machine, I would
try 350000 buffers taking up 700 Mb. You will need to increase LRUs
(try 127) and CLEANERS (127 to match LRUs). Also watch checkpoint
times and be prepared to decrease the interval or LRU_MAX and LRU_MIN.
I also noticed your LOG_BUFF and PHYS_BUFF are still at default
values. There may be some milage in increasing these (even as far as
128 or 256) which can help as well.

Keith

On 31/08/06, Chris Salch <chrissalch@letu.edu> wrote:
>
> And the ratios script shows:
>
> pgsused/(ixda-RA+idx-RA+da-RA)*100
> Read-Ahead Util (RAU): 99.90% 23922139/(6713181+244596+16988224)*100
>
> bufwaits*100 / (pagreads+bufwrits)
> Bufwaits Ratio (BWR): 2.39% (4819402*100) / (30380617+171168299)
> Buffer Turnover(Max):2239.43 (pagreads+bufwrits)/(BUFFERS=90000)
> Buffer Turnover(Min): 349.92 (pagreads+(bufwrits*(1-%
> cached)))/(BUFFERS)
>
> BT Period-max: 19.90/hr every 3.01 minutes.
>
> BT Period-min: 3.11/hr every 19.29 minutes.
>
> Does this look as off as I think it does?
>
> On Thu, 2006-08-31 at 18:22 -0400, Chris Salch wrote:
> > Those stats are reset every sunday at 1:05 am. So that BTR is a
> > significantly higher number than what you have shown. That would be a
> > BTR of about 12 ouch! (by your info)
> >
> > On Thu, 2006-08-31 at 14:57 -0400, ART KAGEL, BLOOMBERG/ 731 LEXIN
> > wrote:
> > > OK, I've calculated the metrics from the onstat -p output below. It's not
> > > particularly useful unless you've zerod the stats more recently than
> server
> > > startup 13 days ago, but here they are:
> > >
> > > Pagreads: 7908428
> > > Bufwrits: 35477827
> > > Bufwaits: 1443280
> > > BUFFERS: 90000
> > > Time (hours) since reset: 321.33
> > > ixda-RA: 2346196
> > > idx-RA: 86301
> > > da-RA: 4646343
> > > RA-pgsused: 7071512
> > >
> > > BR = (1443280 / (35477827 + 7908428)) * 100.00 = 3.3200
> > > BTR = (((35477827 + 7908428) / 90000) / 321.33) = 1.5002
> > > RAU = (7071512/(2346196+86301+4646343)) * 100.00 = 99.8900
> > >
> > > These look fine, but a shorter accumulation period would give more
> reliable
> > > numbers. For best results you should be saving the underlying values at
> > least
> > > daily (some save them before and after peak load periods each day) and
> > > clearing
> > > the stats at least weekly. That will allow you to recalculate the metrics
> > over
> > > several time spans and during peak periods.
> > >
> > > Art S. Kagel
> > >
> > > ----- Original Message -----
> > > From: Chris Salch <ids@iiug.org>
> > > At: 8/31 14:42:38
> > >
> > > ( Unfortunatly, none of us thought to save any of that data when things
> > > started slowing down, so all we've got is what we can remember. )
<SNIPPED>

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