APAR status
Closed as program error.
Error description
Error Message: GC pause times that can be up to a few minutes in length. Verbose GC log example: <gc-op id="45470" type="classunload" timems="163058.757" contextid="45455" timestamp="2017-06-14T20:36:54.692"> <classunload-info classloadercandidates="2461" classloadersunloaded="75" classesunloaded="944" anonymousclassesunloaded="0" quiescems="0.000" setupms="979.330" scanms="162078.954" postms="0.472" /> </gc-op> . Stack Trace: N/A . If a system profile is taken (TProf/Perf) during the long GC pause, you would see the function detechFromRAT as the highest CPU consumer. The CPU utilization during the pause time would show that only one CPU core is working at 100% with other cores being idle.
Local fix
N/A
Problem summary
The JIT needs to manage a table of assumptions that have been made when methods are compiled. These assumptions allow the JIT to react when any assumption is broken as a result of new classes being loaded. In cases where the JIT has compiled a larger number of methods and the JVM is unloading classes during a GC cycle, it's possible for the JIT to take a long time to clean up any assumptions that have been registered against methods of the classes that are being unloaded.
Problem conclusion
The process for cleaning up runtime assumptions in the JIT compiler has been improved such that it can execute much faster in cases were a larger number assumptions are being cleaned up during class unloading. . This APAR will be fixed in the following Java Releases: 8 SR5 FP11 (8.0.5.11) . 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
IJ04409
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-02-23
Closed date
2018-03-06
Last modified date
2018-03-06
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:
06 March 2018