APAR status
Closed as program error.
Error description
Error Message: Performance regression is seen on varies benchmarks on all platforms for about 2%-6%. . Stack Trace: N/A .
Local fix
Use the Java option -XX:-EnableHCR to disable bytecode instrumentation. Notice this could result in Java agent not working properly.
Problem summary
The regression resulted from an attempt to trigger recompilations for methods whose callees get redefined. The extra calls to trigger recompilation are inserted into multiple places in generated code in most of the compiled methods. This increases the size of the code cache and results in performance regression.
Problem conclusion
The source code has been updated to avoid inserting extra calls to trigger recompilation. . This APAR will be fixed in the following Java Releases: 8 SR5 FP27 (8.0.5.27) . 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
IJ12109
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-12-11
Closed date
2018-12-11
Last modified date
2018-12-11
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:
11 December 2018