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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 10:44 a.m.

In Response To: cpuvp efficiency AIX 7.1/IDS 11.5.FC8 (MARK SCRANTON)


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 S. Kagel, President and Principal Consultant
ASK Database Management


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 <>

> 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
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.


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