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Re: Subversion trunk (r1078338) HTTP(/WC?) performance problems?

From: Ivan Zhakov <ivan_at_visualsvn.com>
Date: Tue, 8 Mar 2011 17:07:30 +0300

On Tue, Mar 8, 2011 at 17:01, John Beranek <john_at_redux.org.uk> wrote:
> On 08/03/11 09:34, Ivan Zhakov wrote:
>> On Tue, Mar 8, 2011 at 12:21, John Beranek <john_at_redux.org.uk> wrote:
>>> On 08/03/11 05:34, Justin Erenkrantz wrote:
>>>> On Mon, Mar 7, 2011 at 3:26 PM, John Beranek <john_at_redux.org.uk> wrote:
>>>>> Hmm...I'm surprised (and disappointed). No one is interested in
>>>>> Subversion 1.7 being lower performance than 1.6?
>>>>
>>>> You're not telling us something we don't already know (go read the
>>>> archives some time).  Many folks are still working on improving the
>>>> performance of 1.7...so, general complaints aren't going to be
>>>> terribly productive.
>>>
>>> I think "general complaints" is a bit unfair on me.
>>>
>>> I posted specific timings using the current trunk code, in case it was
>>> news to anyone.
>>>
>>> I guess from now on I'll just keep my investigations to myself.
>>>
>> Hi John,
>>
>> I'm really interested of performance tests especially of ra_serf.
>> Performance degradation of svn import over ra_serf looks very strange.
>> Could you please provide more details about your configuration?
>
> OK, I've been a bit more rigorous on my latest ra_serf import tests. So,
> on a Fedora 14 x86_64 machine (gcc 4.5.1, APR 1.3.9) I built 1.6.16 with
> serf 0.7.1, and trunk(r1078338) with serf 0.7.1.
>
> I imported the same dataset over HTTP to another server on the LAN. This
> server runs Apache 2.2.3 with mod_dav_svn 1.6.15, it is a CentOS 5.5
> machine.
>
> So, the timings:
>
> 1.6.16 (http-library=neon):
> real    0m17.105s
> user    0m1.133s
> sys     0m1.343s
>
> trunk (http-library=neon):
> real    0m15.881s
> user    0m0.968s
> sys     0m1.029s
>
> 1.6.16 (http-library=serf):
> real    2m46.610s
> user    0m1.277s
> sys     0m1.543s
>
> trunk (http-library=serf):
> real    2m45.159s
> user    0m1.057s
> sys     0m1.169s
>
> Now, that is looking like a serious problem, rather different to my
> previous comparison, which compared a remote ra_neon access to a local
> ra_serf access.
>
Yes, it looks like a serious problem. May I ask you to try build
Subversion trunk with serf trunk [1] and repeat your tests?

[1] http://serf.googlecode.com/svn/trunk/

-- 
Ivan Zhakov
Received on 2011-03-08 15:08:22 CET

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