APAR status
Closed as program error.
Error description
Error Message: Global Marking Phase is running much more frequently, almost running back to back, it causes high CPU usage and lower performance . Stack Trace: N/A . <gc-op id="58218" type="copy forward" timems="180.606" contextid="58214" timestamp="2019-11-11T12:53:53.114"> ... <references type="soft" candidates="21757" cleared="0" enqueued="0" dynamicThreshold="12" maxThreshold="32" /> <references type="weak" candidates="1865" cleared="0" enqueued="0" /> ... </gc-op> none of references have been cleared during gc-op copyforward
Local fix
this issue can be worked around using -Xgcpolicy:gencon option
Problem summary
missing to clear soft/weak reference during copyforward increases live bytes promotion and causes the more frequent Global Marking Phase cycles
Problem conclusion
The JVM has been updated to clear the reference correctly during copyforward . This APAR will be fixed in the following Java Releases: 8 SR6 FP5 (8.0.6.5) . 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
IJ21009
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
2019-11-14
Closed date
2019-11-14
Last modified date
2019-11-14
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