PQ68390: DYNACACHE DOES NO SCALE ON ZLINUX ON A 4 WAY ZSERIES MACHINE

APAR status
Closed as program error.

Error description
On a 4 way zSeries machine, When dynacahe is enables on zLinux
and 404, there is a problem with scalability. Throughput is
deminished on a 4-way but is ok on a 1 or 2 way zSeries machine.
There is an open defect that is currently being worked. Number
is 153990
Local fix Problem summary
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* USERS AFFECTED: WebSphere Application Server users on        *
*                 multiprocessor zLinux machines               *
****************************************************************
* PROBLEM DESCRIPTION: Dynacache does not scale well on zLinux *
*                      on a 4way zSeries machine               *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When attempting to run Dynacache on a 4-way zLinux machine,
the performance was lower than on a single CPU machine.
Problem conclusion
Due to internal coding storage, the context switching caused by
running on 4-ways or higher was limiting the performance of
Dynacache. Redesigning those storage objects allowed the
switching rate to drop from 140K to 42K, thus improving the
system resource usage by Dynacache and the overall performance
of the product.
Temporary fix Comments
APAR information
APAR number PQ68390
Reported component name WAS AE LINUX/ZS
Reported component ID 5724B6108
Reported release 400
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2002-11-19
Closed date 2003-02-07
Last modified date 2003-02-07

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
CACHEMGT          

Fix information
Fixed component name WAS AE LINUX/ZS
Fixed component ID 5724B6108

Applicable component levels
R400 PSY    UP


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > General
Operating system(s):
Software version: 400
Software edition:
Reference #: PQ68390
IBM Group: Software Group
Modified date: Feb 7, 2003