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Re: Configuring CPUVP's in an IBM LPAR environment

Posted By: Madison Pruet
Date: Tuesday, 8 February 2005, at 10:14 a.m.

In Response To: Re: Configuring CPUVP's in an IBM LPAR environment (Martin Fuerderer )

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The only thing that I'm not sure of is what will happen if you try to u=
se
processor affinity.

=

"Martin Fuer...." =

<MARTINFU@de.ibm. =

com> =
To
Sent by: ids@iiug.org =

forum.subscriber@ =
cc
iiug.org =

Subj=
ect
Re: Configuring CPUVP's in an IB=
M
02/08/2005 02:39 LPAR environment [4196] =

AM =

=

=

=

=

=

Hi,

as far as I know, there's no special code dealing with "logical" CPUs,
meaning that we do not differenciate between logical CPUs and
physical CPUs. For the IDS server the partitioning into logical CPUs
is transparent.

So with an otherwise normal configuration of IDS, you should be fine
with 8 NUMCPUVPs, or maybe 7 NUMCPUVPs to leave one free
for the other processes (other than CPUVPs) that are also part of
a running server instance.

I'm not sure however, what the effects would be of using configurations=

like AFFINITY and/or NOAGE. They might simply be ignored by the
OS for logical CPUs, but I don't know. If they are not ignored, then
I imagine that they could have an adverse effect. But I never
tried/tested any of these within a "logical CPU" environment.

Regards,
Martin
--
Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management

forum.subscriber@iiug.org wrote on 08.02.2005 06:14:05:
> Are there any best practices for configuring CPU VP's when using AIX
logical
> partioning? I'm currently working with a 4 physical CPU machine. It=
's
been
> carved up into 16 logical CPUS. I have 2 physical (8 logical) CPU's=

> dedicated to the production partition. I'm currently guessing that
NUMCPUVP
> should be set to 8. How does the engine interact with logical CPU's=
?
>
> DT
> --
> Dave Thacker
> Senior Systems Administrator
> Omni Hotels Reservation Center
> V:402-952-6535 F:402-334-8013 M: 402-981-4613 (24/7)

=

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The only thing that I'm not sure of is what will happen if you try t=
o use processor affinity. 
<img src=3D"cid:10__=3D09BBE531DFC0A20E8f9e8a93df938@us.ibm.com" width=3D=
"16" height=3D"16" alt=3D"Inactive hide details for "Martin Fuer..=
.." <MARTINFU@de.ibm.com>">"Martin Fuer...." <M=
ARTINFU@de.ibm.com> 
 
 

<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td style=3D"background-image:url(cid:20__=3D09BBE53=
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th=3D"40%">
<ul>
<ul>
<ul>
<ul>"Martin Fuer...." <MARTINFU@de.ibm=
.com> 
Sent by: forum.subscriber@iiug.org
02/08/2005 02:39 AM</ul>
</ul>
</ul>
</ul>
</td><td width=3D"60%">
<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D09BBE531DFC0A20E8f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""> 
<div align=3D"right">To</div></td><td width=3D"=
100%"><img src=3D"cid:30__=3D09BBE531DFC0A20E8f9e8a93df938@us.ibm.com" =
border=3D"0" height=3D"1" width=3D"1" alt=3D""> 
ids@iiug.org</td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D09BBE531DFC0A20E8f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""> 
<div align=3D"right">cc</div></td><td width=3D"=
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border=3D"0" height=3D"1" width=3D"1" alt=3D""> 
</td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D09BBE531DFC0A20E8f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
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<div align=3D"right">Subject</div></td><td widt=
h=3D"100%"><img src=3D"cid:30__=3D09BBE531DFC0A20E8f9e8a93df938@us.ibm.=
com" border=3D"0" height=3D"1" width=3D"1" alt=3D""> 
Re: Configuring CPUVP's in an IBM LPAR environment [4=
196]</td></tr>
</table>

<table border=3D"0" cellspacing=3D"0" cellpadding=3D"0">
<tr valign=3D"top"><td width=3D"58"><img src=3D"cid:30__=3D09BBE531DFC0=
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/td></tr>
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</td></tr>
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<tt>Hi, 
 
as far as I know, there's no special code dealing with "logical&qu=
ot; CPUs, 
meaning that we do not differenciate between logical CPUs and 
physical CPUs. For the IDS server the partitioning into logical CPUs<br=
>
is transparent. 
 
So with an otherwise normal configuration of IDS, you should be fine<br=
>
with 8 NUMCPUVPs, or maybe 7 NUMCPUVPs to leave one free 
for the other processes (other than CPUVPs) that are also part of 
a running server instance. 
 
I'm not sure however, what the effects would be of using configurations=
 
like AFFINITY and/or NOAGE. They might simply be ignored by the 
OS for logical CPUs, but I don't know. If they are not ignored, then<br=
>
I imagine that they could have an adverse effect. But I never 
tried/tested any of these within a "logical CPU" environment.=
 
 
Regards, 
Martin 
-- 
Martin Fuerderer 
IBM Informix Development Munich, Germany 
Information Management 
 
forum.subscriber@iiug.org wrote on 08.02.2005 06:14:05: 
> Are there any best practices for configuring CPU VP's when using A=
IX 
logical 
> partioning?  I'm currently working with a 4 physical CPU mach=
ine.  It's 
been 
> carved up into 16 logical CPUS.   I have 2 physical (8 logica=
l) CPU's 
> dedicated to the production partition.  I'm currently guessin=
g that 
NUMCPUVP 
> should be set to 8.   How does the engine interact with logic=
al CPU's? 
> 
> DT 
> -- 
> Dave Thacker 
> Senior Systems Administrator 
> Omni Hotels Reservation Center 
> V:402-952-6535 F:402-334-8013 M: 402-981-4613 (24/7) 
 
 
</tt> 
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Messages In This Thread

Configuring CPUVP's in an IBM LPAR environment
Dave Thacker -- Tuesday, 8 February 2005, at 12:13 a.m.
- Re: Configuring CPUVP's in an IBM LPAR environment
  Martin Fuerderer -- Tuesday, 8 February 2005, at 3:39 a.m.
  - Re: Configuring CPUVP's in an IBM LPAR environment
    Madison Pruet -- Tuesday, 8 February 2005, at 10:14 a.m.
    - Re: Configuring CPUVP's in an IBM LPAR environment
      Malcolm Perrior -- Tuesday, 8 February 2005, at 11:43 a.m.
- Re: Configuring CPUVP's in an IBM LPAR environment
  Obnoxio The Chav -- Tuesday, 8 February 2005, at 4:27 a.m.

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