IV74382: ADAPTIVE SPIN OCCASIONALLY REDUCES THROUGHPUT

APAR status

• Closed as program error.

Error description

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

Local fix

• Run with -Xthr:noAdaptSpin to disable adaptive spinning.
  

Problem summary

• Adaptive spinning may disable spinning on a lock that would
  benefit from continued spinning.
  

Problem conclusion

• The JVM has updated the adaptive spinning algorithm to determine
  if spinning should be re-enabled for a lock.
  .
  This APAR will be fixed in the following Java Releases:
     6 R1 SR8 FP7   (6.1.8.7)
     8    SR1 FP10  (8.0.1.10)
     7 R1 SR3 FP10  (7.1.3.10)
     7    SR9 FP 10 (7.0.9.10)
  .
  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

• R260 PSY

     UP

• R270 PSY

     UP