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IDS Forum

Re: VPCLASS cpu on sun/oracle M4000 machine

Posted By: Art Kagel
Date: Wednesday, 24 August 2011, at 7:32 a.m.

In Response To: Re: VPCLASS cpu on sun/oracle M4000 machine (GERARDO PADIERNA)

On a single unload you are IO bound, only a single thread is needed to do
the data acquisition unless the table is fragmented and you are doing the
unload under positive PDQPRIORITY. Parallel unloading is the answer to
utilizing more CPU that is why my dbexport replacement utility, myexport,
has a parallel export option which can unload <N> tables at a time in
parallel.

Your BTR calculation looks right, so at least for the unloads you have
plenty of buffers.

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 Wed, Aug 24, 2011 at 4:36 AM, GERARDO PADIERNA <g.padierna@gmail.com>wrote:

> Hi Art,
> both of them:
> VPCLASS cpu,num=16,aff=(1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31),noage
> VPCLASS cpu,num=32,aff=(1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31),noage
> work (as I told Dave, I understand what I was doing wrong with the VPCLASS
> syntax). But despite of the fact that now upon boot-up informix reports
> correctly:
> 09:04:37 Affinitied VP 1 to phys proc 1
> 09:04:37 Affinitied VP 3 to phys proc 3
> 09:04:37 Affinitied VP 4 to phys proc 5
> 09:04:37 Affinitied VP 5 to phys proc 7
> 09:04:37 Affinitied VP 6 to phys proc 9
> 09:04:37 Affinitied VP 7 to phys proc 11
> 09:04:37 Affinitied VP 8 to phys proc 13
> 09:04:38 Affinitied VP 9 to phys proc 15
> 09:04:38 Affinitied VP 10 to phys proc 17
> 09:04:38 Affinitied VP 11 to phys proc 19
> 09:04:38 Affinitied VP 12 to phys proc 21
> 09:04:38 Affinitied VP 13 to phys proc 23
> 09:04:38 Affinitied VP 14 to phys proc 25
> 09:04:38 Affinitied VP 15 to phys proc 27
> 09:04:38 Affinitied VP 16 to phys proc 29
> 09:04:38 Affinitied VP 17 to phys proc 31
> 09:04:38 Affinitied VP 18 to phys proc 1
> 09:04:39 Affinitied VP 19 to phys proc 3
> 09:04:39 Affinitied VP 20 to phys proc 5
> 09:04:39 Affinitied VP 21 to phys proc 7
> 09:04:39 Affinitied VP 22 to phys proc 9
> 09:04:39 Affinitied VP 23 to phys proc 11
> 09:04:39 Affinitied VP 24 to phys proc 13
> 09:04:39 Affinitied VP 25 to phys proc 15
> 09:04:39 Affinitied VP 26 to phys proc 17
> 09:04:39 Affinitied VP 27 to phys proc 19
> 09:04:39 Affinitied VP 28 to phys proc 21
> 09:04:40 Affinitied VP 29 to phys proc 23
> 09:04:40 Affinitied VP 30 to phys proc 25
> 09:04:40 Affinitied VP 31 to phys proc 27
> 09:04:40 Affinitied VP 32 to phys proc 29
> 09:04:40 Affinitied VP 33 to phys proc 31
>
> still, during the unload process, CPU usage, as shown by prstat -a isn't
> any
> higher as 1,3 - 1.4%:
> $ prstat -a
> (...)
>
> 221 root 20M 7360K sleep 59 0 0:02:53 0,0% devfsadm/8
> NPROC USERNAME SWAP RSS MEMORY TIME CPU
>
> 81 informix 4648M 4191M 13% 30:54:07 1,4%
>
> 82 root 607M 427M 1,3% 49:51:03 0,1%
>
> 3 webspher 1994M 1842M 5,6% 23:32:02 0,0%
>
> 1 mancbrid 92M 97M 0,3% 1:38:36 0,0%
>
> 1 smmsp 2080K 5864K 0,0% 0:01:24 0,0%
>
> 1 tomapp 124M 94M 0,3% 0:48:18 0,0%
>
> 1 noaccess 126M 140M 0,4% 1:29:34 0,0%
>
> 5 daemon 6768K 8864K 0,0% 0:17:25 0,0%
>
> and, after a while, the onstat -g glo | cpu output shows this:
> vp pid class usercpu syscpu total Thread Eff
> 1 8291 cpu 81.46 71.62 153.08 549.35 27%
> 3 8334 cpu 84.16 79.51 163.67 624.29 26%
> 4 8335 cpu 108.68 135.33 244.01 1129.99 21%
> 5 8336 cpu 79.91 106.29 186.20 887.67 20%
> 6 8337 cpu 34.93 47.13 82.06 320.40 25%
> 7 8338 cpu 29.55 39.13 68.68 250.40 27%
> 8 8339 cpu 21.36 27.03 48.39 182.10 26%
> 9 8340 cpu 13.41 17.38 30.79 115.30 26%
> 10 8341 cpu 5.44 5.30 10.74 38.62 27%
> 11 8342 cpu 2.54 2.35 4.89 19.08 25%
> 12 8343 cpu 1.07 0.89 1.96 7.50 26%
> 13 8344 cpu 0.43 0.42 0.85 3.20 26%
> 14 8345 cpu 0.24 0.30 0.54 1.54 35%
> 15 8346 cpu 0.08 0.09 0.17 0.31 55%
> 16 8347 cpu 0.03 0.07 0.10 0.10 100%
> 17 8348 cpu 0.03 0.09 0.12 0.12 100%
> 18 8349 cpu 0.03 0.05 0.08 0.08 100%
> 19 8350 cpu 0.03 0.04 0.07 0.00 0%
> 20 8351 cpu 0.02 0.03 0.05 0.00 0%
> 21 8352 cpu 0.02 0.03 0.05 0.00 0%
> 22 8353 cpu 0.03 0.04 0.07 0.00 0%
> 23 8354 cpu 0.03 0.03 0.06 0.00 0%
> 24 8355 cpu 0.03 0.03 0.06 0.00 0%
> 25 8356 cpu 0.03 0.03 0.06 0.00 0%
> 26 8357 cpu 0.03 0.04 0.07 0.00 0%
> 27 8358 cpu 0.03 0.04 0.07 0.00 0%
> 28 8359 cpu 0.03 0.04 0.07 0.00 0%
> 29 8360 cpu 0.03 0.03 0.06 0.00 0%
> 30 8361 cpu 0.03 0.04 0.07 0.00 0%
> 31 8362 cpu 0.02 0.03 0.05 0.00 0%
> 32 8363 cpu 0.02 0.03 0.05 0.00 0%
> 33 8364 cpu 0.02 0.03 0.05 0.00 0%
>
> You can see the usercpu and syscpu columns are almost for most of the cpu
> VP,
> so I think it's obviously not using more than 8 to 10 cpu VP. Why doesn't
> it
> use more CPU power?
>
> The BTR, calculated according to what you explain here:
>
>
> http://www.dbmonster.com/Uwe/Forum.aspx/informix/3869/Informix-Performance-Issues
> is:
> Pagreads: 263011805
> Bufwrits: 27528339
> Bufwaits: 842113
> BUFFERS: 1024000
> Time since reset: 113.0
> ixda-RA: 3813274
> idx-RA: 8352
> da-RA: 7911577
> RA-pgsused: 11529856
> _________________________
> BTR = ((27528339 + 263011805)/1024000)/113.0 = 2.51/hour
>
> (I have a doubt here: is the first term for BTR Bufwrits or Bufwaits? I
> used
> Bufwrites).
>
> Update:
> I've just tested a different approach here: until now I was doing just one
> 'unload to <file> select * ...'. I've launched several simultaneous unloads
> and there the CPU usage goes up. I did 11 unloads and CPU went up to around
> 15%, which is roughly:
> 1.3% CPU usage per unload * 11 unloads = 14.3%
> In this way I managed to unload 61GB data in 25min, whereas in a single
> unload
> it takes about 3h,30min. I will have to have a closer look at this
> simultaneous unloads to make it work safely, without data loss, but this is
> a
> different story.
>
> So it seems clear to me know that for whatever reason this machine, with
> the
> configuration I have, doesn't use more than about 1/2 a thread per unload
> process (if it used up 1 whole cpu thread per unload one should expect
> about
> 1/32*100 = 3.125% CPU usage, but there's only half of it...).
>
> Cheers!
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--20cf307cffc4ed5de504ab3ea9f2

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