IBM has improved the topas command (part of the bos.perf.tools fileset) substantially in AIX 5.3. Before these changes, topasdid not have the ability to capture historical data, nor was itenhanced for use in shared partitioned environments. (The command's –Lflag now reports partitioned information.) By incorporating thesechanges to let you collect performance data from multiple partitions,IBM has really simplified the capability of topas as a performance management and capacity planning tool. The command's look and feel is quite similar to top and monitor (used in other Unix variants).
The topasutility displays all kinds of information on your screen in atext-based, graphical type of format. In its default mode, it providesa myriad of CPU, memory, and I/O information. Some recent changes:
As of TL_4 of AIX 5.3, topas uses a daemon named xmwlm, which is automatically started from the inittab.
As of TL_5 of AIX 5.3, the system keeps seven days of data as a default and records almost all the topas data that is displayed interactively, except for process and Workload Manager (WLM) information. You can use the topasout command to generate text-based reports. By specifying the –C flag, you can actually view monitoring information across all partitions in an IBM POWER system.
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