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IV73741: SLOW MONITOR CLEARING ON ZOS IN JAVA 626/70

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: 1        CEEOPMD     +000009F6
         2        pthread_mutex_destroy
    
         3        j9thread_monitor_destroy
    
         4        objectMonitorDestroy
    
         5
    MM_MarkingSchemeRootClearer::doMonitorReference(J9ObjectMoni
    
         6
    MM_RootScanner::scanMonitorReferences(MM_EnvironmentModron*)
    
         7
    MM_RootScanner::scanClearable(MM_EnvironmentModron*)
    
         8
    MM_MarkingScheme::markLiveObjectsComplete(MM_EnvironmentStan
    
         9        MM_ParallelMarkTask::run(MM_EnvironmentModron*)
    
         10       MM_Dispatcher::run(MM_EnvironmentModron*,MM_Task*)
    
         11
    MM_ParallelGlobalGC::masterThreadGarbageCollect(MM_Environme
    
         12
    MM_ConcurrentGC::internalGarbageCollect(MM_EnvironmentModron
         13
    MM_Collector::garbageCollect(MM_EnvironmentModron*,MM_Memory
    
         14
    MM_MemorySubSpace::systemGarbageCollect(MM_EnvironmentModron
         15
    MM_MemorySubSpace::systemGarbageCollect(MM_EnvironmentModron
    .
    Garbage Collection Mark cycle takes long time. Performance
    profiling shows pthread_mutex_destroy as one of most "hot" calls
    

Local fix

  • Non
    

Problem summary

  • Destruction of mutexes can take long time on ZOS which might
    prolong GC Marking stage.
    

Problem conclusion

  • Code was changed to optimize work with monitors and avoid
    destruction of mutexes during GC Marking stage
    .
    This APAR will be fixed in the following Java Releases:
       7    SR9 FP 10 (7.0.9.10)
       6 R1 SR8 FP7   (6.1.8.7)
    .
    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

    IV73741

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-05-29

  • Closed date

    2015-05-29

  • Last modified date

    2015-06-29

  • 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

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP

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Document Information

Modified date:
21 February 2022