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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. ------------------------------- * wa (or wio): Wait for IO time. This value represents the percentage of time during the sample interval that CPUs were idle yet processes were waiting for IO before they could consume CPU resources. Not all IO subsystems will show wait for IO time, even when there are significant IO wait issues. If a wait for IO column is not shown, all wait for IO time becomes part of the idle time. * st: Stolen time. This represents the percentage of time during the interval stolen from a virtual machine. This can be considered part of the true idle time. If you are not running a virtual machine, this value should always be zero. Referencing Figure 4-7, the CPU subsystem is busy around 25% of the time; that is, it's idle around 75% of the time. There appears to be plenty of available CPU capacity; that is, the operating system's CPU capacity has exceeded Oracle's requirements. 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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