use_large_pages parameter and AMM [message #517949] |
Fri, 29 July 2011 11:59 ![Go to next message Go to next message](/forum/theme/orafaq/images/down.png) |
John Watson
Messages: 8944 Registered: January 2010 Location: Global Village
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It always used to be that Automatic Memory Management and Linux huge pages were incompatible: you had to use one or the other. But 11.2.0.2 has new parameter, USE_LARGE_PAGES. This isn't documented apart from a few articles on metalink, but Googling it suggests that if it is on TRUE (the default) or ONLY then I can use AMM with huge pages.
Is anyone doing this on Linux? And will it have any effect on other operating systems?
Thanks for any insight.
[update: typo]
[Updated on: Fri, 29 July 2011 12:02] Report message to a moderator
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Re: use_large_pages parameter and AMM [message #518737 is a reply to message #518011] |
Fri, 05 August 2011 15:50 ![Go to previous message Go to previous message](/forum/theme/orafaq/images/up.png) ![Go to next message Go to next message](/forum/theme/orafaq/images/down.png) |
John Watson
Messages: 8944 Registered: January 2010 Location: Global Village
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Senior Member |
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My second reply to myself.
As far as I can see, all the web references that say AMM and Huge Pages can be used together come from this one web article:
http://abiliusta.blogspot.com/2011/04/huge-pages-and-amm-is-possible-and.html
Following some research, this article appears to be a total mis-understanding of the use_large_pages parameter. The parameter does not permit use of huge pages. Its purpose is to force an error if huge pages are not available, rather than letting Oracle revert silently to non-huge pages.
Sorry I publicised this mistake. According to Oracle Corp, AMM and huge pages are incompatible. And that's it.
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