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Re: [PATCH] sort: use posix_fadvise to announce access patterns on files


From: Chen Guo
Subject: Re: [PATCH] sort: use posix_fadvise to announce access patterns on files opened for reading
Date: Fri, 26 Feb 2010 21:14:49 -0800 (PST)

Hi, 


> It's interesting that the increased read ahead didn't
> improve anything for your mechanical disk. I suppose the
> default read ahead values are tuned well there already.

Since high variance was mentioned, I'd say there's the
possibility the performance is there, it's just buried under
random variation. I think there's a chance if we
average 100 run times off disk we'd see something.





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