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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 4-16 shows an example of using the Linux sar command for sampling memory page swapping. Linux uses the uppercase W, while all other Unix platforms use the lowercase w parameter. As Figure 4-16 shows, there is absolutely no memory swapping occurring. This is what we like to see! Figure 4-16. The sar -W command being used to check if there is any memory page swapping occurring. In this sample, swapping is not occurring, which is exactly what we want to see. SunOS, Solaris, and HP-UX have a process that is continually looking for free memory. The more memory being requested, the more aggressive this process becomes. 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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