CWMRT2007W message (for time-based trigger evaluation) may be indicative of performance degradation for a monitor model

Technote (troubleshooting)


Problem(Abstract)

A monitor model produces several CWMRT2007W warning messages in the SystemOut.log file in the server or cluster where the moderator EJB for the model is running; eventually the model may completely stop processing inbound events.

Symptom

Warning messages similar to the following appear in the SystemOut.log file on the server (stand-alone environment) or the cluster members where the moderator EJB for the model is deployed (network deployment environment):

[12/10/10 2:43:22:410 EST] 00000058 ConsumerDaemo W com.ibm.wbimonitor.om.ClipsAndTacks.20100722090000.runtime.moderator.ConsumerDaemonSerialST issueTimeBasedEvent() CWMRT2007W: It took more than a third of the time based triggers check interval to evaluate the time based triggers.  This might cause a performance degradation
        Monitoring Model ID: ClipsAndTacks
        Monitoring Model Version: 20100722090000
        Execution Time (so far): 181
        ++++ Check runtime properties to increase the time based triggers check interval.



Cause

Evaluating time-based triggers cuts into the time available for regular inbound event processing. If this evaluation happens frequently, and the incoming event rate does not stay relatively low, a performance degradation can result. It is also important to note that the more active instances there are for the monitoring contexts in which time based triggers are defined, the longer each time based trigger evaluation cycle (frequency defined by the Recurring wait time check interval property in the model runtime configuration) will take to complete.

Resolving the problem

The Recurring wait time check interval can be increased in the model runtime configuration via the WebSphere administrative console. Refer to this Information Center link (for Version 7.0, but this information also applies equally to Versions 6.1.2 and 6.2):


http://publib.boulder.ibm.com/infocenter/dmndhelp/v7r0mx/topic/com.ibm.btools.help.monitor.admin.doc/admin/model_cfg_runtime.html

Note that step 9 of the procedure states that the monitor model application must be restarted for the property change to take effect.

This property should not be set to a value higher than the smallest evaluation interval for all time based triggers defined in the monitor model, to ensure that all triggers are evaluated frequently enough.


Historical Number

48305
7TD
000
46151
7TD
000
46151
7TD
000

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Document information


More support for:

WebSphere Business Monitor
Event Processing

Software version:

6.1.2, 6.2, 7.0

Operating system(s):

AIX, HP-UX, Linux, Linux zSeries, Solaris, Windows

Reference #:

1506975

Modified date:

2011-08-23

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