Re: Question about performance and space

On Thursday 11 November 2010, Thorsten Schöning wrote:
> am Donnerstag, 11. November 2010 um 14:37 schrieben Sie:
> > Doesn't the client understand the file history if you 'svn switch' to the
> > tag path in a working copy and just get the differences, if any?

If you use switch, it will only transfer the differences. Tagging a WC and
switching to that directory is fast.

> OK, maybe I'm wrong, because I don't use svn switch but always use
> complete working copies with all tags, branches etc. checked out and
> just work in different folders at the same time, if neccessary. In
> this case every other developer would have large updates with each new
> tag.

I sometimes need multiple working copies of the same URL, so I couldn't do
that. Further, and that's IMHO more important in the context of performance,
I don't think that SVN performs commits and updates in linear complexity,
i.e. doubling the size more than doubles the required time. This means that
having all tags (even those of long obsolete alpha releases) and all branches
(even of features I don't work on or which are finished and reintegrated) of
every project (even those I neither work on nor use) causes lots of overhead.
What helps, apart from completely separate checkouts, is "svn switch"ing
unused parts to an empty directory, which are then also skipped on updates.
Generally, two separate WCs perform better than one large one.

I'm curious what the upcoming changes to the WC handling libraries in SVN 1.7
will do though, it's worth keeping an eye on!

Cheers!

Uli

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