----- Original Message -----
> On Fri, Apr 25, 2014 at 11:10 AM, Roman Naumenko < roman_at_naumenko.ca
> > wrote:
> > ----- Original Message -----
>
> > > On Tue, Apr 22, 2014 at 9:53 AM, Mark Phippard <
> > > markphip_at_gmail.com
> > > >
> > > I remember this. The deadly operation was the initial checkout on
> > > network based file systems, especially CIFS on the Windows boxes.
> > > The
> > > few servers that ran NFS acted much more like Linux hosts, or
> > > like
> > > Linux hosts usin gNFS. A number of changes in Subversion, over
> > > time,
> > > reduced the perfidious chattiness that hampered CIFS baed
> > > checkouts,
>
> > > and all Windows users with network mounted working copies became
>
> > > *much* happier.
>
> > >
>
> > > Let's do be careful to draw distinctions between local file
> > > systems,
>
> > > like NTFS and ext4, and network file systems like CIFS and NFS.
> > > I'm
>
> > > afraid it's common to handwave those away as not making a
> > > difference,
>
> > > and they really do.
> > Maybe windows users are happier (they are not), but Linux users are
> > just scratching their heads over svn performance.
>
> > svn, version 1.7.8 (r1419691), standard redhat vm.
>
> > NFS:
>
> > A benchmark-svn/trunk/notes/tree-conflicts/scratch-pad.txt
>
> > A benchmark-svn/trunk/notes/tree-conflicts/use-cases-resolution.txt
>
> > A benchmark-svn/trunk/notes/tree-conflicts/design-overview.txt
>
> > A benchmark-svn/trunk/notes/tree-conflicts/detection.txt
>
> > ^Csvn: E200015: Caught signal
>
> > real 0m26.980s
>
> > user 0m0.454s
>
> > sys 0m1.281s
>
> > [11:02:30 user_at_host:~/svn_tests ] $ du -sh benchmark-svn
>
> > 12M benchmark-svn
>
> > Local:
>
> > A
> > /tmp/benchmark-svn/branches/1.6.x/subversion/libsvn_fs_base/bdb/reps-table.c
>
> > A
> > /tmp/benchmark-svn/branches/1.6.x/subversion/libsvn_fs_base/bdb/bdb_compat.h
>
> > ^Csvn: E200015: Caught signal
>
> > real 0m13.241s
>
> > user 0m3.939s
>
> > sys 0m4.731s
>
> > [11:02:30 user_at_host:~/svn_tests ] $ du -sh /tmp/benchmark-svn
>
> > 144M /tmp/benchmark-svn
>
> > What we've got here, 20x or something?
>
> That was a known consequence of moving to SQLite for storage of the
> metadata. SVN 1.8 offers a solution for those that can use it:
> http://subversion.apache.org/docs/release-notes/1.8.html#exclusivelocking
Mark, thank for the link. There is indeed a nice performance boost to the client with exclusive access.
--Roman
Received on 2014-04-25 19:10:02 CEST