APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: N/A . OperatingSystemMXBean.getProcessCpuLoad() and OperatingSystemMXBean.getProcessCpuTimeByNS() return incorrect results.
Local fix
Setting system property "com.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns" to "true" fixes this issue.
Problem summary
OperatingSystemMXBean.getProcessCpuLoad() and OperatingSystemMXBean.getProcessCpuTimeByNS() return incorrect values which are scaled by a factor of 100.
Problem conclusion
OperatingSystemMXBean.getProcessCpuLoad() and OperatingSystemMXBean.getProcessCpuTimeByNS() are dependent upon OperatingSystemMXBean.getProcessCpuTime(). Recently, the API definition of OperatingSystemMXBean.getProcessCpuTime() changed. Before, it returned CPU time in 100 nanosecond units. Now, it returns CPU time in nanoseconds by default but it can also return CPU time in 100 nanosecond units when the system property "com.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns" is to set "true". The implementation of OperatingSystemMXBean.getProcessCpuLoad() and OperatingSystemMXBean.getProcessCpuTimeByNS() has been updated to account for the change in the API definition of OperatingSystemMXBean.getProcessCpuTime(). . This APAR will be fixed in the following Java Releases: 8 SR5 FP5 (8.0.5.5) . 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
IJ02225
Reported component name
J9 COMMON CODE
Reported component ID
620700127
Reported release
270
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-11-28
Closed date
2017-11-28
Last modified date
2017-11-28
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
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Document Information
Modified date:
22 February 2022