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IDS Forum

RE: onstat -g glo: cpu efficiency

Posted By: Habichtsberg, Reinhard
Date: Wednesday, 27 July 2011, at 2:57 a.m.

In Response To: RE: onstat -g glo: cpu efficiency (Tristan Ball)

We have two rather similar systems. They both have 16 cores. One we have
configured with 15 CPU VP's. The other is configured with 25 CPU VP's.

The first system shows an efficiency between 68 and 80, the second not
more than 55. Seems to me that "overbooking" of the real CPU's decreases
the efficiency of a single CPU VP.

Not really astonishing, though ;-)

> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Tristan
> Ball
> Sent: Wednesday, July 27, 2011 6:45 AM
> To: ids@iiug.org
> Subject: RE: onstat -g glo: cpu efficiency [24463]
>
> This is interesting, just looking at a couple of our systems...
>
> Efficiency on CPU threads sits between 60-80%. I suspect that's
probably about
> right, because in our environment the client application is on the
same box
> competing for resources...
>
> The efficiency on all the io classes, PIO/LIO/AIO is very low, between
0 and
> 3%. Is this because the kernel de-schedules these threads while
waiting on the
> actual io to complete?
>
> Thanks,
>
> Tristan
>
> Tristan Ball - Hosted Services Manager VIC
> Pronto Hosted Services
> 20 Lakeside Drive, Burwood East, VIC 3151
> Phone: +61 3 9887 7770 | Email: tristanb@pronto.com.au
> Mobile: +61 408 397 473
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> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Art
> Kagel
> Sent: Wednesday, 27 July 2011 10:10 AM
> To: ids@iiug.org
> Subject: Re: onstat -g glo: cpu efficiency [24462]
>
> I've seen low efficiency numbers mostly when affinity is used.
>
> Art
>
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com)
> Blog: http://informix-myview.blogspot.com/
>
> 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 Tue, Jul 26, 2011 at 8:03 PM, John Miller iii <miller3@us.ibm.com>
wrote:
>
> > The efficiency is an indicator of how well the oninits are being
> > scheduled by the operating system.
> >
> > In short the formula behind the seens is very simple ratio of
> >
> > ( Total OS process time ) / ( total time of the informix threads on
> > the vps)
> >
> > In the stats you provided below:
> >
> > VP #1
> > =====
> > Total time given to the processor
> > 23775.57
> > Total time of all threads running on the VP 36411.97
> >
> > This means that threads where running on the informix oninit process
> > for (36,411 - 23775 = ) 12,636 seconds without finding a hardware
> > processor to run on.
> >
> > John F. Miller III
> > STSM, Embedability Architect
> > miller3@us.ibm.com
> > 503-578-5645
> > IBM Informix Dynamic Server (IDS)
> >
> > ids-bounces@iiug.org wrote on 07/26/2011 02:43:03 PM:
> >
> > > From: "MARK JALKIEWICZ" <mark.jalkiewicz@verizon.net>
> > > To: ids@iiug.org
> > > Date: 07/26/2011 02:43 PM
> > > Subject: onstat -g glo: cpu efficiency [24459] Sent by:
> > > ids-bounces@iiug.org
> > >
> > > I am a bit concerned over what onstat -g glo is reporting
regarding
> > > eff
> > for
> > > the three cpuvp's , they are avg in the mid 60's. Other instances
in
> > > our client's landscape have all three much closer to 100% (however
> > thoseinstances
> > > are no where near as heavily loaded as this one).
> > >
> > > Comments anyone ?
> > >
> > > Individual virtual processors:
> > > vp pid class usercpu syscpu total Thread Eff
> > > 1 4211134 cpu 21241.47 2534.10 23775.57 36411.97 65%
> > > 2 2322448 adm 21.71 20.49 42.20 0.00 0%
> > > 3 3444892 cpu 17728.03 2020.35 19748.38 30409.40 64%
> > > 4 2908326 cpu 10974.72 1206.09 12180.81 18296.49 66%
> > > 5 1396890 lio 0.77 2.78 3.55 3.55 100%
> > > 6 4571320 pio 0.79 2.89 3.68 3.68 100%
> > > 7 573718 aio 0.98 4.33 5.31 5.31 100%
> > > 8 3600816 msc 109.03 84.35 193.38 198.84 97%
> > > 9 3272944 fifo 0.77 2.84 3.61 3.61 100%
> > > 10 4161568 aio 0.79 2.92 3.71 3.71 100%
> > > 11 3764236 soc 423.80 640.31 1064.11 NA NA
> > >
> > > tot 50502.86 6521.45 57024.31
> > >
> > >
> > >
> >
> >
> >
>
>
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> > >
> >
> >
> >
> >
>
>
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> >
> >
>
> --20cf307d00f06a453904a901df34
>
>
>
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