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Re: [Gnu-arch-users] Re: [PATCH] arch speedups on big trees


From: Mark A. Flacy
Subject: Re: [Gnu-arch-users] Re: [PATCH] arch speedups on big trees
Date: 07 Jan 2004 07:42:43 -0600
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

>>>>> "Miles" == Miles Bader <address@hidden> writes:
Miles> 
Miles> There's a big difference; a `signature database' like I'm talking about
Miles> is just an optimization:
Miles> 
Miles>   * It's allowed to be out-of-date or non-exstant -- and you have to
Miles>     deal with these cases.  However, for non-whole-tree operations like
Miles>     changeset application, this sort of up-to-date verification is still
Miles>     only per-file, so much, much faster than statting the whole tree
Miles> 
Miles>   * It's `central' (and perhaps monolithic, e.g., a single file or
Miles>     indexed db file), and so is a lot easier to grok and update
Miles>     efficiently, but doesn't have the automatically-sticks-
Miles>     close-to-the-source properties of taglines or explicit tags.

"Easier to update efficiently" only if you don't allow concurrent access.

-- 
 Mark A. Flacy
 Any opinions expressed above are my own.  Any facts expressed above
 would imply that I know what I'm writing about.  Sometimes, I do!





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