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imapd Kernel-mode CPU Usage is Much Higher Than User-Mode (Doc ID 1289994.1)

Last updated on JULY 26, 2022

Applies to:

Oracle Communications Messaging Server - Version 6.0.0 and later
Information in this document applies to any platform.


Kernel/system mode CPU is much higher than user mode and seems to be associated with imapd processes.  For example, prstat output like:

The number of kernel threads ready to run but there is no CPU available (the 'r' column in the vmstat output) and the number threads in the imapd processes (the 'NLWP' column in the prstat output) and the amount of system mode CPU as compared to user mode indicate a problem.


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