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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. ------------------------------- So far, I have conveniently left out how to measure CPU activity or quantify how long of a queue is too long. Now is the time to delve into the specifics. Monitoring CPU activity can be effectively done by focusing on just two statistics: CPU busyness and CPU queue length. The more common term for CPU busyness is utilization. A CPU subsystem has a single run queue. Utilization is an amazingly simple concept that can be applied in a wide variety of circumstances. It is simply consumption divided by capacity. For example, if we have an empty pitcher with the capacity of four cups, and it currently contains two cups of water, the utilization is 50%. It's not rocket science, but this basic concept is used throughout performance management, both in firefighting and predictive analyses of all kinds. 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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