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IDS Forum

Re: IDS 11 upgrade - slower and different mutexes

Posted By: brucemarchu@aol.com
Date: Wednesday, 11 June 2008, at 8:21 p.m.

Hi John,

Your reply is greatly appreciated.? I will take a look at the items that you mentioned.? Thanks again.

Bruce

-----Original Message-----
From: John Miller iii <miller3@us.ibm.com>
To: ids@iiug.org
Sent: Wed, 11 Jun 2008 12:52 am
Subject: Re: IDS 11 upgrade - slower and different mutexes [12379]

Bruce:

Just a few quick items to check:

1. I would check the onconfig to ensure the PC_HASHSIZE has not change=
d
during the

upgraded. The number of PN_ID mutexes which are created is
determined by

PC_HASHSIZE onconfig parameter. IDS will create 1 mutex for each
HASH.

Example: if PC_HASHSIZE is 311, then we will create 311 mutexes.=
If
this

parameter was lowered during the upgrade then undue contention wo=
uld
be placed on

these mutexes.

2. I would also look at the results of the following sql statement,
specifically for the procedure

name cache.

select * from sysmaster:syssqlcacheprof

EXAMPLE

id 5

name Procedure Name Cache

hits 103

misses 75

removed 8

mem_used 39704

mem_free 1256

total_entries 67

inuse_entries 52

..

John F. Miller III

=

"brucemarchu@aol. =

com" =

<brucemarchu@aol. =
To

com> ids@iiug.org =

Sent by: =
cc

ids-bounces@iiug. =

org Subj=
ect

IDS 11 ugrade - slower and =

different mutexes [12369] =

06/10/2008 03:10 =

PM =

=

=

Please respond to =

ids@iiug.org =

=

=

Hi,

An upgrade from IDS 10.00.FC7 to IDS 11.10.FC2 was just done on an HP-U=
X?
11.23 server with PA-RISC CPU architecture.? Going from IDS 10 to 11.1 =
a
direct conversion of the database is done.? Update statistics was run o=
n
the
database after the conversion.? It was hoped that the application would=

potentially have greater through put with IDS 11.1 because of the
non-blocking
check points and other improvements contained in Cheetah 1.? However,?s=
lam
tests on the database actually showed about a twenty percent decrease i=
n
transaction through put.? The onstat -g wai command? showed lots of mut=
exes

with a description of "mutex hash PN_ID".? While it is not unusual to
see?mutexes during slam tests, a co-worker indicated that he did not
previously see this type of a mutex when using the IDS 10.

Has anyone else seen this type of mutex in IDS 11.1?? Are their any
suggestions for tracing this item down?? Has anyone else upgraded to ID=
S
11.1
and seen a degradation problem?? All the reports that I previously hear=
d
about
Cheetah 1 were positive, so I was surprised by the end result.

Thanks,
Bruce

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