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by Craig Shallahamer Get the book here |
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Craig Shallahamer's Blog
The text below is an except from the book, Oracle Performance Firefighting, written by Craig Shallahamer of OraPub, Inc. Figures and tables are not included on this page, only their reference. To order the book in either print or PDF form, click here. ©2009, 2010 by Craig Shallahamer. This is copyrighted material. Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you. ------------------------------- While vmstat can be used to monitor many system aspects, our current focus is the CPU subsystem. The utilization-related columns are at the far right of the report (Figure 4-7): * us: User time. This represents the percentage of time during the sample interval that CPUs were servicing processes in user mode. For example, when the oracle executable is being processed, most of its time will be deemed user time. * sy (or sys): System time. This value represents the percentage of time during the sample interval that CPUs were servicing processes in system mode. For example, when the process scheduling or virtual memory management occurs, this will be recorded as system time. Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you. |
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