APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: 3XMTHREADINFO3 Java callstack:4XESTACKTRACE at java/util/concurrent/atomic/AtomicLong.incrementAndGet(AtomicLon g.java:205(Compiled Code)) . Other methods of AtomicLong also show a similar performance degradation with JDK 1.6 implementation
Local fix
NA
Problem summary
IBM JDK 6 implemented a Java level synchronization to work around an operating system level cache lock performance bottleneck. As the operating system cache performance bottleneck is resolved over period of time, it overtakes the Java level synchronization performance and hence the current performance degradation is observed compared to the reference implementation.
Problem conclusion
IBM JDK has been updated to remove the work around using Java level synchronization as the operating system level cache performance bottleneck no more exists. Now the implementation is same as reference implementation in JDK 7. . This APAR will be fixed in the following Java Releases: 6 SR16 FP7 (6.0.16.7) 6 R1 SR8 FP7 (6.1.8.7) . 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
IV74925
Reported component name
JAVA CLASS LIBS
Reported component ID
620700130
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-07-08
Closed date
2015-07-08
Last modified date
2015-07-08
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
JAVA CLASS LIBS
Fixed component ID
620700130
Applicable component levels
R600 PSY
UP
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Document Information
Modified date:
08 July 2015