APAR status
Closed as program error.
Error description
Error Message: AIX Customer is experiencing a high CPU (100%) usage as the selector.select() fires repeatedly without returning any positive number of events. . Stack Trace: N/A .
Local fix
N/A
Problem summary
It is basically a timing issue between adding a channel into pollset verses closing the channel (preclose)..the close mechanism uses dup2 to dup the file descriptor into a special pre-close socket before later releasing the file descriptor. consider, When a thread T1 closes a selectable channel at just around the same time that T2 registers the channel's file descriptor with pollset, then it is possible for the pre-close socket to get registered with pollset and the Selector will appear to spin as the pre-close socket is always ready.
Problem conclusion
This defect will be fixed in: 6.0.0 SR10 . The fix is to remove the temporary cache which holds the interestOps & channels and register the channel & interestOps immediately.
Temporary fix
ZE FIX ERROR IV27286 12/10/08
Comments
APAR Information
APAR number
IV27286
Reported component name
JAVA CLASS LIBS
Reported component ID
620700130
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-08-30
Closed date
2012-08-30
Last modified date
2012-11-02
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
JAVA CLASS LIBS
Fixed component ID
620700130
Applicable component levels
R600 PSY
UP
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Document Information
Modified date:
02 November 2012