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Admin Tools Forum

Re:Single Processor / Multi Processor

Posted By: Art Kagel
Date: Monday, 27 August 2007, at 10:42 a.m.

In Response To: Single Processor / Multi Processor (Navaid Arif)

Yes. You should set:

MULTIPROCESSOR 1 # So that the engine will use mutex locking to prevent

# multiple simultaneous updates to the
same data
SINGLE_CPU_VP 0 # if not zero then you are only allow one CPU VP
NUMCPUVPS or VPCLASS setting for CPU class VPs:

Set to at least 3 but as many as 8 - the 4 cores in your processors
are
fast enough to each support at least 2 CPU VPs

Art S. Kagel

----- Original Message -----
From: Navaid Arif <admin-tools@iiug.org>
At: 8/24 10:25:38

Hi All,

I have a machine with following configuration.

############################################
# System Summary
############################################

2 - Physical CPUs
4 - (L)CPUs currently
4 - (L)CPUs configured
1900 - MHz CPU clock rate
PowerPC_POWER5 - Processor
64 bit - Hardware
32 bit - Kernel
Memory - 4 GB
Dynamic - Logical Partition
5.3.0.40 ML04 - AIX Kernel Version

But parameters in ONCONFIG for my IDS are set as:
MULTIPROCESSOR 0 # 0 for single-processor, 1 for multi-processor
NUMCPUVPS 1 # Number of user (cpu) vps
SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one
I have a doubt that these parameters should be MULTIPROCESSOR=1,
NUMCPUVPS=(n-1)=(4-1)=3 and SINGLE_CPU_VP=3

>onstat -p

IBM Informix Dynamic Server Version 10.00.UC5 -- On-Line -- Up 4 days
09:41:15
-- 853776 Kbytes

Profile

dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
51389758 56122057 647129757 92.06 6933791 10141685 40287310 82.79

isamtot open start read write rewrite delete commit rollbk
388214480 18142974 21222280 231088462 1779521 18262908 1467372 2890018 26

gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
1040100 148601 1939995 165003 0 0 4

ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
0 0 2027 96807.91 88708.86 1270 2541

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
7966174 490 2255685626 0 0 304 360971 800697

ixda-RA idx-RA da-RA RA-pgsused lchwaits
1600631 169135 34880881 36249558 106310
Please advice.

Regards,
Navaid Arif

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