Re: svn cleanup and unreferenced pristines

2014-01-11 Thread Branko Čibej 
On 11.01.2014 10:30, Vincent Lefevre wrote:
> On 2014-01-10 14:11:08 -0500, C. Michael Pilato wrote:
>> Just a reminder that there can be performance benefits to not being too
>> aggressive in our pristine purging, since update-style operations will
>> consult the pristine cache before slurping file contents from the
>> server.
> If the working copy is the on same machine as the server, this doesn't
> make much sense to keep unreferenced pristines.

Sure, but that setup is not really common.

> Moreover if you want to speed up things, keeping pristines may not
> be the right way (in particular if the whole files are kept, not
> deltas).

FWIW, you can't reasonably store pristines as deltas because you'd have
to recalculate them every time someone changes the file in the working
copy; and moreover, there's no foolproof way to detect when the WC files
are being changed in time to do that. You'd need support from the OS
filesystem for that (and I don't mean just file change notifications but
copy-on-write per-file snapshots).

> Caching the repository or a part of the repository may be better.

That's exactly what pristines are.

-- Brane


-- 
Branko Čibej | Director of Subversion
WANdisco // Non-Stop Data
e. br...@wandisco.com

Re: svn cleanup and unreferenced pristines

2014-01-11 Thread Vincent Lefevre 
On 2014-01-10 14:11:08 -0500, C. Michael Pilato wrote:
> Just a reminder that there can be performance benefits to not being too
> aggressive in our pristine purging, since update-style operations will
> consult the pristine cache before slurping file contents from the
> server.

If the working copy is the on same machine as the server, this doesn't
make much sense to keep unreferenced pristines.

Moreover if you want to speed up things, keeping pristines may not
be the right way (in particular if the whole files are kept, not
deltas). Caching the repository or a part of the repository may be
better.

-- 
Vincent Lefèvre  - Web: 
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)