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ims_master Using Much More System-mode CPU than User-mode and Delivery Queue Backlog (Doc ID 2051043.1)

Last updated on APRIL 26, 2023

Applies to:

Oracle Communications Messaging Server - Version 5.2.0 and later
Oracle Solaris on SPARC (64-bit)
Oracle Solaris on x86-64 (64-bit)


The ims-ms channel queue on the backend message store system has more messages in the backlog than normal. (If you are using LMTP, this would be the LMTP channels on the MTAs). Most are Pending rather than Delayed.

Using imsimta qm sum -hosts; and imsimta top top -to; would help to identify if the problem is specific to a particular backend store (with LMTP) or a specific user.

On the backend system, vmstat shows system-mode CPU is much higher than user-mode. The following example is from a relatively small system. On large, multi-core systems, the ratio of user:system is the important thing to look at - you might still have plenty of idle CPU:


Users are being moved from backend message store systems which use ZFS to new store systems which use NFS.


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