Fixes are available
8.0.0.2: WebSphere Application Server V8.0 Fix Pack 2
8.0.0.3: WebSphere Application Server V8.0 Fix Pack 3
8.0.0.4: WebSphere Application Server V8.0 Fix Pack 4
8.0.0.5: WebSphere Application Server V8.0 Fix Pack 5
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
APAR status
Closed as program error.
Error description
Performance improvement for server startup.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM WebSphere Application * * Server V8.0 * **************************************************************** * PROBLEM DESCRIPTION: Excessive JIT compilation increases * * the start time of a WebSphere * * Application Server for z/OS server. * **************************************************************** * RECOMMENDATION: * **************************************************************** The Java JIT compiler provides a performance boost by compiling frequently used classes in such a way that future invocations of those classes perform better. However, the initial compilation of these classes takes additional time. For classes that are used often throughout the life of the server, it is worth taking the initial time to compile them in order to obtain future performance benefits. During server startup, numerous classes are loaded that will rarely be invoked after startup is complete. Compiling all of these classes is often unnecessary and can increase server start time. The JIT compiler should be optimzied to avoid unnecessary compilations during server startup.
Problem conclusion
WebSphere Application Server for z/OS code was modified to inform the JIT compiler of the beginning and end of server startup. The JIT compiler can use this information to make better decisions about which classes to compile, thereby improving server start time. APAR PM49485 is currently targeted for inclusion in Service Level (Fix Pack) 8.0.0.2 of WebSphere Application Server. Please refer to the Recommended Updates page for delivery information: http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980 In addition, please refer to URL: http://www.ibm.com/support/docview.wss?rs=404&uid=swg27006970 for Fix Pack PTF information.
Temporary fix
Comments
APAR Information
APAR number
PM49485
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-10-06
Closed date
2011-10-11
Last modified date
2012-08-09
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500
Applicable component levels
R800 PSY
UP
Document Information
Modified date:
28 October 2021