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Re: renaming under CVS

From: Noel Yap
Subject: Re: renaming under CVS
Date: Mon, 25 Feb 2002 05:52:11 -0800 (PST)

--- Paul Sander <address@hidden> wrote:
> >--- Forwarded mail from address@hidden
> >I'm starting to think about a scheme where CVS
> would
> >go through a filename mapping if the usual archive
> >file isn't found (I think this is how Meta-CVS
> works).
> > The mapped archive file would only exist if
> there's
> >been a rename or move.  I don't think such a scheme
> >would _fundamentally_ break backwards
> compatibility.
> I've given a lot of thought to this over the past
> few years, and
> due to the way that locking is done in CVS
> (filesystem-based cookies),
> a simple mapping mechanism will drive performance
> way down if a lot of
> renaming is done.  This is because (in the general
> case) the mapping
> mechanism will drive the creation of locks in many
> directories that
> are not really the focus of the user's attention.
> To keep it efficient enough to use, I think that the
> locking
> mechanism needs to be removed from the filesystem
> and placed into
> a process, which means losing the benefits of
> supporting local
> mode (at least until the server modes become
> multi-threaded).

Actually, I was thinking that, in the long run, it'll
improve performance.  Let's say that all filenames are
now mapped to their corresponding archive files, then
there's really need to create one lock file for the
entire module much as CC locks the entire VOB.  In
fact, if backwards compatibility weren't an issue (eg
if it's a new repository), this behaviour could be the

I was also thinking about the above and figured that
CVS would have to check the mapping before it checked
the normal way it did things to avoid problems with

> Noel, you've certainly been far more professional
> and way less
> abusive!!

Why, thank you, I've been striving to be more so in
general these past few months.  (Now if I can only
remember to check the CC field when replying to Greg


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