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Re: [Monotone-devel] slow update/status on NFS

From: Benoît Dejean
Subject: Re: [Monotone-devel] slow update/status on NFS
Date: Wed, 23 May 2007 21:35:18 +0200

Le mercredi 23 mai 2007 à 10:26 +0200, Markus Schiltknecht a écrit :
> Hi,
> Richard Levitte wrote:
> > I just looked at the patch, and although I can see that it fixes
> > things for status, I think it could be taken one step further (and
> > thereby generalising the solution) by modifying the file_path class to
> > have a status cache.
> Shouldn't the OS do that sort of caching? That's probably why there's no 
> difference with local filesystems. But why does the kernel not cache NFS 
> stat() calls? Can we somehow teach the kernel to do that caching, so we 
> don't have to write our own?

Yes it does, but even on a local filesystem, savings 4000 system calls
is not a stupid thing. Doing 4x in a row the same syscall on the same
file is stupid. I don't think we need caching : we just need to do the
things as many times as necessary.
Benoît Dejean

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