Chapter 9. Initial performance considerations 231
these processes upon any substantial changes to size or policy complexity of the
management domain (for example, going from 10s to 100s of managed servers; 10 to 50
transaction classes). The default maxHeap settings for these are: domain manager - 512MB,
WebSphere Application Server - 256MB. The maxHeap for the domain manager can be
increased on the startDM script via the -maxHeap parameter. The maxHeap for WebSphere
Control Center can be increased via the WAS Administrator Console.
The 504 managed server/simple policy and the 252/504 managed server/complex policy test
scenarios all required increasing the java maximum heap for the domain manager process.
Additionally, the 504 managed server/complex policy test scenario required increasing the
maximum heap for the WebSphere Application Server process. Recall we had already set the
domain manager process -maxHeap to 1800 for all of our tests. After first hitting an
out-of-memory condition on the WebSphere Application Server, we re-started it with a
maximum heap size of 320MB.
9.2.8 Domain manager on i5/OS
Following are some charts that show the domain manager resources usage when running on
i5/OS.
Figure 9-4 shows the CPU, the memory, and the disk usage for the domain manager internal
database with the different model policies and the managed servers scaling factor.
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