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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. ------------------------------- Figure 4-4. Graphically, on a 12-CPU core system, queuing doesn't look like an issue until around 85% busy. Notice that once the CPUs are around 90% busy, response time skyrockets! On a 12-CPU core system, the elbow of the curve occurs at around 85% busy. With fewer cores, queuing becomes significant much sooner. And with more cores, CPUs can be much busier before queuing becomes significant. Look closely near the elbow of the curve in Figure 4-4. Notice that once we enter the elbow of the curve, response time skyrockets. I call this "the wall." Any senior DBA will have experienced this. 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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