APAR status
Closed as program error.
Error description
Error Message: Poor performance when running jdmpview commands on large system dumps. For example, running the 'info class', 'info thread' or 'info lock' commands on an 8Gb system dump may take approximately 15 mins. . Stack Trace: at java/util/HashMap$TreeNode.find at java/util/HashMap$TreeNode.find at java/util/HashMap$TreeNode.find at java/util/HashMap$TreeNode.find at java/util/HashMap$TreeNode.find at java/util/HashMap$TreeNode.putTreeVal at java/util/HashMap.putVal at java/util/HashMap.put at java/util/HashSet.add at com/ibm/j9ddr/vm26/j9/walkers/HeapWalker.processFlatMonitor at com/ibm/j9ddr/vm26/j9/walkers/HeapWalker.doState at com/ibm/j9ddr/vm26/j9/walkers/HeapWalker.doState at com/ibm/j9ddr/vm26/j9/walkers/HeapWalker.walk at com/ibm/j9ddr/vm26/j9/walkers/HeapWalker.runFlatLockMonitorRegio nWalk at com/ibm/j9ddr/vm26/j9/walkers/HeapWalker.initializeFlatLockedMon itors at com/ibm/j9ddr/vm26/j9/walkers/HeapWalker.getFlatLockedMonitors at com/ibm/j9ddr/vm26/j9/walkers/MonitorIterator.<init> at com/ibm/j9ddr/vm26/view/dtfj/java/j9/DTFJMonitorIterator.<init> . A Java stack trace taken while the command is running shows that excessive time is taken when processing flat locked monitors during the heap walk.
Local fix
Problem summary
The problem is caused when jdmpview is processing flat locked monitors during the heap walk on a large system dump.
Problem conclusion
The DTFJ/DDR API used by jdmpview has been updated to improve performance. . This APAR will be fixed in the following Java Releases: 8 SR2 (8.0.2.0) 7 SR9 FP20 (7.0.9.20) 6 R1 SR8 FP15 (6.1.8.15) 7 R1 SR3 FP20 (7.1.3.20) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the available Service Refreshes and Fix Packs can be found at: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IV76936
Reported component name
J9 COMMON CODE
Reported component ID
620700127
Reported release
270
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-09-11
Closed date
2015-09-29
Last modified date
2015-09-29
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
J9 COMMON CODE
Fixed component ID
620700127
Applicable component levels
R270 PSY
UP
R260 PSY
UP
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
Document Information
Modified date:
21 February 2022