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Re: Trials with memcached

From: Tony Butt <Tony.Butt_at_cea.com.au>
Date: Fri, 8 Jul 2011 10:41:43 +1000

On Fri, 2011-07-08 at 02:59 +0300, Daniel Shahaf wrote:
> This doesn't address memcached directly, but there has been a /lot/ of
> work on server-side optimization and caching in 1.7 (also for
> non-memcached-backed caches).
>
> http://subversion.apache.org/docs/release-notes/1.7#server-performance-tuning
>
> You might want to take 1.7.0-alpha3 for a spin...
>
Probably don't want to do that.
We are in a commercial environment, with some 20 developers relying on
subversion - not the time for an alpha release.

We are actually happy with the current performance, particularly since
the load of other tasks on the server (backups, opengrok indexing of the
repo for instance) is now shared by 4 processors instead of 1. I was
reviewing the overall configuration, and we already use memcached to
support ReviewBoard for code reviews.

We will be particularly interested in server side performance
improvements when 1.7.0 is released - we have home grown build
dependency tools that are sometimes heavy on the repository usage -
these will be difficult to upgrade to 1.7.0, but if there are uncoupled
server performance improvements, the server upgrade is trivial by
comparison.

Thanks,
Tony Butt
> Tony Butt wrote on Wed, Jul 06, 2011 at 15:20:27 +1000:
> > We are running subversion 1.6.17 on a vmware hosted server. We recently
> > reconfigured the server to give 4 virtual CPUs (up from 1), and a
> > significant amount of memory.
> >
> >
> > In order to spruce up our performance a little, I looked into the use of
> > memcached with subversion again, found the correct config parameter, and
> > set it up. Our server is running Ubuntu 10.04, Apache 2.2. Access
> > mechanism is http (of course). The client used is running Ubuntu 11.04,
> > and svn commandline (1.6.17 also)
> >
> > The results were interesting, to say the least.
> >
> > Checkout of a tree, about 250M in size:
> >
> > Without memcached, 1 1/2 to 2 minutes, varies with server load
> > With memcached, 12 minutes (!)
> >
> > Update of the same tree,
> > Without memcached, 9 seconds
> > With memcached, 14 seconds - repeated several times, similar results.
> >
> > I am not sure what anyone else's experience is, but we will not be
> > enabling memcached for subversion any time soon.
> > --
> > Tony Butt <tjb_at_cea.com.au>
> > CEA Technologies
> >

--
Tony Butt <tjb_at_cea.com.au>
CEA Technologies
Received on 2011-07-08 04:01:22 CEST

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