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Re: files.el: Once again impossible to turn off dir-settings
From: |
Stefan Monnier |
Subject: |
Re: files.el: Once again impossible to turn off dir-settings |
Date: |
Tue, 25 Nov 2008 20:37:06 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) |
>>> (setq vc-ignore-dir-regexp
>>> "\\`\\([\\/][\\/]\\|/net/\\|/home/\\|/afs/\\)\\'")
>>> Notice the addition of /home above -- in my case /home is nfs
>>> mounted.
>>
>> NFS mounting as such is normally not a problem. So could you explain
>> exactly how is /home mounted? Is it an autofs mount? Do accesses to
>> /home/foobar automatically trigger access to some network server (even
>> if /home/foobar doesn't actually exist)?
> I don't know if this is what T. V. Raman is using, but I have experience
> of a setup where moving up the directory hierachy eventually leads to
> extreme slowness. When (say) your home directory is mounted on AFS (a
> distributeed network file system), moving up the AFS file hierachy
> eventually brings you to the /afs root directory. This directory is
> populated by literally thousands of files, each of which on a different
> server (each is a different AFS cell).
Indeed. Which is why /afs is handled specially in
locate-dominating-stop-dir-regexp. With NFS this problem normally
doesn't happen.
> Doing something like `ls' in this directory can take minutes.
dir-settings (and VC) doesn't use the equivalent of `ls' (aka
directory-files). Instead it looks specifically for the few files that
could matter (e.g. CVS/Entries, .dit-settings.el, ...). This can make
a very large difference.
> (I don't use this setup anymore, though; this was on a campus network
> where AFS was widely used.)
Yes, I've used AFS as well. Neat thing (other than Kerberos whose
timeouts I don't like).
Stefan
Re: files.el: Once again impossible to turn off dir-settings, Juri Linkov, 2008/11/25