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Re: Tuning the unified buffer cache

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Re: Tuning the unified buffer cache

Subject: Re: Tuning the unified buffer cache
From: Quinn <email@hidden>
Date: Tue, 4 Mar 2008 12:37:36 +0000

At 3:04 +0000 2/3/08, Joel Reymont wrote:

I understand that a 'no cache' option is available in the open call but I don't have access to the source code of the software I'm working with.

On 10.5 there are actually two no cache options, F_NOCACHE, which works on a file descriptor, and F_GLOBAL_NOCACHE, which works on the file system object itself (the vnode). You could write a separate tool that opened the file, set it globally non-cacheable (F_GLOBAL_NOCACHE) and held it open for the duration of the job.

S+E
--
Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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  >Tuning the unified buffer cache (From: Joel Reymont <email@hidden>)




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