PQ66175: EXTENSIVE GARBAGE COLLECTION OCCURING WITH MARK STACK OVERFLOW | |||||||||||||||||||||||||||||||||||||||
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![]() APAR status Closed as program error. Error description Extended GC times associated with "mark stack overflow". Heap- roots analysis shows large trees associated with com/ibm/s ervlet/util/SimpleHashtable (WebSphere).Local fix Problem summary **************************************************************** * USERS AFFECTED: WebSphere Application Server installations * * experiencing large Garbage Collections. * **************************************************************** * PROBLEM DESCRIPTION: Extended Garbage Collections (GC) * * associated with Mark Stack overflow. * **************************************************************** * RECOMMENDATION: * **************************************************************** Extended Garbage Collection times associated with Mark Stack Overflow are being executed due to an imbalanced Hashtable object. When the hashtable was reaching its peak capacity and required resizing, the hashtable was not being rehashed to properly take advantage of this increased capacity. The lack of rehashing caused poor performance relating to seek times for objects in the hashtable.Problem conclusion Modified the WebSphere internal Hashtable implementation to properly rehash when the hashtable is expanded.Temporary fix Comments
APAR is sysrouted FROM one or more of the following: PQ66150 APAR is sysrouted TO one or more of the following: Modules/Macros
SRLS
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Document Information |
Product categories: Software > Application Servers >
Distributed Application & Web Servers > WebSphere Application
Server > General
Operating system(s):
Software version: 400
Software edition:
Reference #: PQ66175
IBM Group: Software Group
Modified date: Sep 13, 2002
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