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Re: Kernel VS application file caching
On Jan 21, 2010, at 9:25 AM, Sad Clouds wrote:
> As far as I know Unix kernels will transparently cache files into any
> available memory to speed up future I/O on those files.
> For applications like Internet servers, which serve many static files from
> disk, is there any point in implementing file caching at application level?
> seems like you would end up with 2 copies of the same data - one copy cached
> by kernel, another copy cached by application.
To avoid kernel-to-userland copies?
What is your real performance limit? CPU? RAM? I/O bandwidth? Network
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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