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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. ------------------------------- * CPU: The -u option shows the average for all CPUs. There is also a sar option to show utilization activity for each CPU. Refer to the sar manual page for details. * %nice: Nice time. This represents the percentage of time during the sample interval that CPUs were servicing processes in which their priority had been lowered-in effect, they have been nice to other processes. This time counts as CPU utilization and can be also considered user mode time. Oracle systems tend to have zero nice time. The total idle time is the sum of %iowait, %steal, and %idle time. Referring to Figure 4-8, the CPU subsystem is utilized around 20% to 30%, so the CPU subsystem is idle between 70% to 80% of the time. It appears there is plenty of CPU power available. 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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