IBM Support

PK88824; 6.1.0.27: excessive concurrency in dynacache

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Abstract

Performance of dynacache get operations in high volume environments is diminished.

Download Description

PK88824 resolves the following problem:

ERROR DESCRIPTION:
Dynacache gets are excessively synchronized causing thread lock outs during high load

LOCAL FIX:
none

PROBLEM SUMMARY

USERS AFFECTED:
All users of IBM WebSphere Application Server using dynacache.

PROBLEM DESCRIPTION:
Performance of dynacache get operations in high volume environments is diminished.

RECOMMENDATION:
None

In order to protect the cache instance dynacache uses synchronized blocks to allow synchronous access to get operations. This synchronization is excessive and severely slows down dynacache users during a stress situation.

PROBLEM CONCLUSION:
Excessive synchronization has been eliminated to allow get operations to perform at a more acceptable level.

The fix for this APAR is currently targeted for inclusion in
fix packs 6.0.2.39, 6.1.0.29, and 7.0.0.7. Please refer to the
Recommended Updatespage for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Prerequisites

None

Installation Instructions

Please review the readme.txt for detailed installation instructions.

[{"INLabel":"Readme","INLang":"US English","INSize":"7340","INURL":"ftp://public.dhe.ibm.com/software/websphere/appserv/support/fixes/PK88824/readme.txt"}]
On
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Technical Support

Contact IBM Support using SR (http://www.ibm.com/software/support/probsub.html), visit the WebSphere Application Server Support Web site (http://www.ibm.com/software/webservers/appserv/was/support/), or contact 1-800-IBM-SERV (U.S. only).

[{"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Component":"Dynamic Cache","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF012","label":"IBM i"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":"7.0.0.5;6.1.0.27","Edition":"Base;Network Deployment","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
07 December 2019

UID

swg24025039

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