Generating graphs at the DCL level offers the most efficient method of selecting data. Only those metrics contributing to the selected graphs are saved and bucketed when the performance data is read. The CPU demand is mostly for reading and decoding the data files. By contrast, the data selection for the DECwindows and command mode interfaces is somewhat more costly because all the performance metrics are usually saved and bucketed in anticipation of a subsequent user request to view them. See Appendix D for information on estimating virtual memory needs and selecting data.
To generate a graph or pie chart
$ ADVISE PERFORMANCE GRAPH $ ADVISE PERFORMANCE PIE_CHART
With either command, you can control the data selection by specifying a time period and list of node names. The /TYPE qualifier specifies graphs or performance metrics or both. The /FORMAT qualifier controls the format of the output data. The /OUTPUT qualifier directs the output data to the desired destination.
You can generate all of the predefined graphs in a single command by using the /TYPE=ALL_GRAPHS qualifier. However, if you do not specify a graph, the CPU Utilization graph is the default.
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