Specific performance problems

This section discusses the problems of storage and poor performance.

 

Storage problems

If you receive the system message

CPF0907. Serious storage condition may exist it is possible that you are filling up the space associated with the WebSphere MQ for iSeries queue managers.

 

Is your application or WebSphere MQ for iSeries running slowly?

If your application is running slowly, this could indicate that it is in a loop, or waiting for a resource that is not available.

This could also be caused by a performance problem. Perhaps it is because your system is operating near the limits of its capacity. This type of problem is probably worst at peak system load times, typically at mid-morning and mid-afternoon. (If your network extends across more than one time zone, peak system load might seem to you to occur at some other time.)

If you find that performance degradation is not dependent on system loading, but happens sometimes when the system is lightly loaded, a poorly designed application program is probably to blame. This could manifest itself as a problem that only occurs when certain queues are accessed.

QTOTJOB and QADLTOTJ are system values worth investigating.

The following symptoms might indicate that WebSphere MQ for iSeries is running slowly:

• If your system is slow to respond to MQSC commands.

• If repeated displays of the queue depth indicate that the queue is being processed slowly for an application with which you would expect a large amount of queue activity.

• Is MQ trace running?