IV74619: REDUCED NUMBER OF GARBAGE COLLECTOR THREADS WHEN USING MULTIPLE NUMA NODES

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  

Local fix

• The number of garbage collector threads can be manually set by
  the user using the "-Xgcthreads" option. For example, to set the
  number of garbage collector threads to 3 use "-Xgcthreads3"
  

Problem summary

• On systems with multiple NUMA nodes, the number of garbage
  collector threads (reported as "gcthreads" in the verbosegc
  output) may be set according to the processor count of a single
  node rather than the whole system.
  

Problem conclusion

• The number of garbage collector threads is now set to the number
  of available processors of the system.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR1 FP10  (8.0.1.10)
     7 R1 SR3 FP10  (7.1.3.10)
  .
  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 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

• R270 PSY

     UP