APAR status
Closed as program error.
Error description
Error Message: Under some circumstances customers using a Java agent that performs class redefinition may experience a larger performance impact with Java 8 SR5 than with earlier releases. . Stack Trace: N/A .
Local fix
The problem can be avoided by using the following option: -Xjit:disableNextGenHCR Note that there can only be a single -Xjit option on the command line, and if necessary multiple options can be combined using commas.
Problem summary
When a class is redefined, a JIT-compiled method inlining the redefined callees transfers from the JIT-compiled code to the interpreted code to avoid executing a stale version of the redefined callee. The issue is caused by doing the transition everytime the caller method is invoked.
Problem conclusion
The JIT-Compiler has been updated to recompile the method the first time it transits from the JIT-compiled code to the interpreted code to avoid doing the transition repeatedly. . This APAR will be fixed in the following Java Releases: 8 SR5 FP17 (8.0.5.17) . 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
IJ06892
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-06-06
Closed date
2018-07-16
Last modified date
2018-07-16
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
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"130","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
16 July 2018