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IDS Forum

Re: cpuvp efficiency AIX 7.1/IDS 11.5.FC8

Posted By: Art Kagel
Date: Friday, 26 June 2015, at 10:54 a.m.

In Response To: Re: cpuvp efficiency AIX 7.1/IDS 11.5.FC8 (Paul Watson)

Limiting to two threads instead of 4 also helps.

Art

Art S. Kagel, President and Principal Consultant
ASK Database Management
www.askdbmgt.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 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 Fri, Jun 26, 2015 at 10:50 AM, Paul Watson <paul@oninit.com> wrote:

> I would also add, test with SMT off - I have found you can drive the
> server harder sooner with SMT disabled, although the absolute max
> throughput was the same. Your sysadmins will hate turning off SMT, but it
> is an easy test to do
>
> Cheers
> Paul
>
> > Mark:
> >
> > As I understand it, the efficiency is a ratio of time spent by the CPU
> VPs
> > in processing server threads against total CPU time which would include
> > polling, spinning, etc. In theory the higher the efficiency the fewer
> > cycles are being wasted. Some use it to determine whether there are too
> > many CPU VPs (if efficiency is low). I do not follow that myself.
> > Assuming that there are more concurrent client sessions I want sufficient
> > CPU VPs to process all active user threads (so sqlexec, sort threads,
> scan
> > threads, merge threads, etc.) in parallel. Or, at least, as many as the
> > CPU cores can handle.
> >
> > When I overclock the CPU VPs (which is what I call it when there are more
> > CPU VPs than processor cores) the efficiency of the CPU VPs goes down so
> > those who follow the efficiency would deduce that there are more VPs than
> > are needed. However, I know that overclocked the server is more
> responsive
> > and gets more work done.
> >
> > A perfect example is a client I recently worked with. They were running a
> > P7 system with 5 processor cores (so 20 hardware SMP threads) and 5 CPU
> > VPs
> > and processing 20 complex transactions a second. I overclocked them to 20
> > CPU VPs and increased throughput to 120 transactions per second pushing
> > the
> > cores to 99% utilization. So a 300% increase in CPU VPs resulted in a
> 500%
> > increase in throughput. We needed more cores to reach their SLA
> > requirements so we tested the theory that adding CPU cores would scale
> > linearly. First we added one core without adding any CPU VPs. Throughput
> > increase by a small amount but not significantly and idle time was around
> > 8-12% across all 6 cores. Then I added four more CPU VPs an 18% increase
> > in the number of VPs. Processor idle time went down to 1-3% and
> > transaction throughput improved by ... 18%,
> >
> > Efficiency with one VP per core was around 75% with 40% idle time on the
> > processors. With four VPs per core it was around 25% with 1-3% idle time.
> > Far worse "efficiency" numbers but far better performance!
> >
> > Do I recommend running the machine at close to 100% under normal
> > conditions? No, they need headroom for growth, but that just means they
> > need more cores to meet their SLAs and also have some headroom on the box
> > for the future.
> >
> > Art
> >
> > Art S. Kagel, President and Principal Consultant
> > ASK Database Management
> > www.askdbmgt.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 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 Fri, Jun 26, 2015 at 9:31 AM, MARK SCRANTON <mark@markscranton.com>
> > wrote:
> >
> >> AIX 7.1
> >> lpar info:mode=Uncapped smt=On lcpu=16 mem=32768MB psize=6 ent=2.00
> >> 16 CPUVPS; IDS 11.5.FC8
> >>
> >> Question regarding cpu efficiency (a metric I've never played much
> >> with).
> >> An
> >> "onstat -g glo" shows cpuvp efficiency ranges from 12-14% all the time.
> >> Similar in production (bigger box, higher entitlement, etc.) I'm not
> >> worried
> >> about "load balancing" - in earlier IDS we didn't try to load
> >> balance/time
> >> slice, etc. and haven't heard that that has changed. Anyone have
> >> concerns
> >> about efficiency being in the this range all the time?
> >>
> >> Thanks -
> >> Mark Scranton
> >> The Mark Scranton Group
> >> mark@markscranton.com
> >>
> >>
> >>
> >>
> >
>
> *******************************************************************************
> >> Forum Note: Use "Reply" to post a response in the discussion forum.
> >>
> >>
> >
> > --047d7bdc11bc0bbc6d05196cc796
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
>
> --
> Paul Watson
> Tel: +1 913-674-0360
> Mob: +1 913-387-7529
> Web: www.oninit.com
>
> Oninit® is a registered trademark of Oninit LLC
>
> Failure is not as frightening as regret.
> If you want to improve, be content to be thought foolish and stupid.
> What this country needs are more unemployed politicians
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--bcaec519694121172a05196ceaa8

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