APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: N/A . The performance regressed 20-34% running micro benchmark SPECjvm2008.serial on PPC.
Local fix
Problem summary
The regression was introduced by the fix to a faulty optimization which is described in APAR IV67534. After disabling the faulty optimization, the JIT generates some expensive instructions for method java.lang.ref.SoftReference.get() on PPC.
Problem conclusion
The JIT compiler has been updated to generate more efficient instructions for java.lang.ref.SoftReference.get(). . This APAR will be fixed in the following Java Releases: 8 SR2 FP10 (8.0.2.10) 7 R1 SR4 (7.1.4.0) . 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
IV80393
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-01-15
Closed date
2016-01-15
Last modified date
2016-01-15
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
[{"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:
15 January 2016