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IDS Forum

RES: VPCLASS cpu on sun/oracle M4000 machine

Posted By: Celso Cabral Coimbra
Date: Tuesday, 23 August 2011, at 8:46 a.m.

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

Gerardo,

It probably will depend on machine architecture, it has changed since Enterprise series, you can see in prtdiag on my environment, Informix would take one cpuvp on each physical cpu.
This is the example on my solaris machine e6900. It means Sun has changed the architecture since that.
========================= CPUs ===============================================

CPU Run E$ CPU CPU
FRU Name ID MHz MB Impl. Mask
---------- ------- ---- ---- ------- ----
/N0/SB0/P0 0,512 1350 16.0 US-IV 3.1
/N0/SB0/P1 1,513 1350 16.0 US-IV 3.1
/N0/SB0/P2 2,514 1350 16.0 US-IV 3.1
/N0/SB0/P3 3,515 1350 16.0 US-IV 3.1
/N0/SB2/P0 8,520 1350 16.0 US-IV 3.1
/N0/SB2/P1 9,521 1350 16.0 US-IV 3.1
/N0/SB2/P2 10,522 1350 16.0 US-IV 3.1
/N0/SB2/P3 11,523 1350 16.0 US-IV 3.1

I Don't understand your concern, despite that each core works separately, depends on the machine architecture, it will reduce message exchange on shared memory and reduce the %sys utilization, improving the performance.
Why do you have a so big machine to use so little?

Celso Cabral Coimbra
Administrador de Banco de Dados
ClearTech Ltda
"Trust at the heart of Communications"
Tel. (11) 3576-4509

-----Mensagem original-----
De: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] Em nome de GERARDO PADIERNA
Enviada em: terça-feira, 23 de agosto de 2011 08:51
Para: ids@iiug.org
Assunto: VPCLASS cpu on sun/oracle M4000 machine [24663]

Hello,
I have an IDS 11.50.FC6 instance on an M4000 oracle server with 4 CPUs with 4
cores * 2 threads each. The OS (Solaris 10) 'sees' a total of 32 CPUs.
The thing is, I'm trying to tune the cpu VPCLASS onconfig parameter so that
this instance is able to use more CPU power, but I can't figure out the
correct configuration.
My question: If I set the VPCLASS config parameter like this:
VPCLASS cpu,num=4,aff=(0-7,8-15,16-23,24-31),noage
why starts the engine reporting this upon reboot?
12:57:11 Affinitied VP 1 to phys proc 0
12:57:11 Affinitied VP 3 to phys proc 1
12:57:11 Affinitied VP 4 to phys proc 2
12:57:11 Affinitied VP 5 to phys proc 3
If I understand this right, this clearly means that all informix VP are pinned
to the same physical processor, the 1st one, which has a total of 8 virtual
processors (0-7). I check this my running:
$ prsinfo -vp:
The physical processor has 8 virtual processors (0-7)
SPARC64-VII (portid 1024 impl 0x7 ver 0xa1 clock 2530 MHz)
The physical processor has 8 virtual processors (8-15)
SPARC64-VII (portid 1032 impl 0x7 ver 0xa1 clock 2530 MHz)
The physical processor has 8 virtual processors (16-23)
SPARC64-VII (portid 1040 impl 0x7 ver 0xa1 clock 2530 MHz)
The physical processor has 8 virtual processors (24-31)
SPARC64-VII (portid 1048 impl 0x7 ver 0xa1 clock 2530 MHz)

But, according to the config parameter above, shouldn't the 4 informix cpu VP
be pinning to vp=0, vp=8, vp=16 and vp=24? Is this a bug (or a feature)?

Note: I've also tried the shorter one:
VPCLASS cpu,num=4,aff=(0-32/n)
where I tried n=8, n=4, etc, but I get always the same result: cpu VP always
get pinned to OS virtual processors 0,1,2,3,.... always in that order.

Just if somebody is interested, the background of all that is that for certain
unload/load tasks the CPU power I'm getting is way to low. In fact, when I
issue a prstat -a, never ever the total power reported for user 'informix' is
above 1,4%, it doesn't matter how many cpu VPs I add, which is ridiculously
low. Can anybody give me a hint on this? Thanks.

*******************************************************************************
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