APAR status
Closed as program error.
Error description
Error Message: Some applications showed a 15-33% regression compared with earlier Java releases. Verbose log shows compilationExcessiveComplexity failure on some of the hottest methods. . Stack Trace: N/A . This regression is seen on all platform (x,p,z).
Local fix
The issue can be worked around using the -Xjit:disableLoopVersioner option.
Problem summary
The problem is caused when optimizer reaches number of loops limit. If the limit is reached, JIT will abort the current compilation and try to recompile the method at a lower optimization level.
Problem conclusion
Number of loops limit has been increased for veryhot/scorching methods to prevent this issue. . This APAR will be fixed in the following Java Releases: 8 SR1 (8.0.1.0) . 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
IV72274
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-04-15
Closed date
2015-04-15
Last modified date
2015-04-15
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
JIT
Fixed component ID
620700124
Applicable component levels
R130 PSY
UP
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Document Information
Modified date:
15 April 2015