Investigating the overall system

Within WebSphere MQ, the performance problem is either increased response time or an unexpected and unexplained heavy use of resources. You should first check factors such as total processor usage, DASD activity, and paging. An IBM tool for this is resource management facility (RMF). In general, we need to look at the system in some detail to see why tasks are progressing slowly, or why a given resource is being heavily used.

Start by looking at general task activity, then focus on particular activities, such as specific tasks or a specific time interval.

Another possibility is that the system has limited real storage; therefore, because of paging interrupts, the tasks progress more slowly than expected.