IV25689: MXBEAN TOTAL JIT COMPILATION TIME DECREASES

APAR status

• Closed as program error.

Error description

• Error Message: The CompilationMXBean method getCompilationTime()
  may return incorrect data if the system's     calendar time is
  adjusted.
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• Compilation time measurement may be affected by adjustments to
  the system's calendar time.  The calendar time may be adjusted
  such that the current time is before the last compilation start
  time. In such cases, the difference between current time and
  last compilation start time will be negative, and adding this
  value to the total compilation time will cause the total
  compilation time to decrease.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR11
  6.0.1 SR3
  7.0.0 SR2
  .
     Monotonic time replaced the calendar time for compilation
  time calculations. Also extra checks for time going backwards
  and timer wraparound are added to VM. In the cases where time
  goes backwards, total compilation time stays same.
  

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

• R600 PSY

     UP

• R260 PSY

     UP