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Re: merge very slow

From: Stefan Küng <tortoisesvn_at_gmail.com>
Date: Sun, 15 Jun 2008 15:02:08 +0200

Branko Čibej wrote:
> Stefan Küng wrote:
>> Lieven Govaerts wrote:
>>> Stefan Küng wrote:
>>>> Hi,
>>>> I've noticed that a merge done with a client built with VS2008 is
>>>> twice as slow as a client built with VC6. Has anyone here noticed
>>>> that too?
>>>> I've described my efforts to solve this problem here:
>>>> http://tortoisesvn.tigris.org/servlets/ReadMsg?list=dev&msgNo=34103
>>>> If anyone has any idea what could cause this, I'd really appreciate
>>>> any help.
>>> The obvious question first: you are using a Release build of course?
>>> Concerning profiling, IBM has a 15-days trial edition of Rational
>>> PurifyPlus at their website:
>>> http://www-306.ibm.com/software/awdtools/purifyplus/
>>> I've never used it (well, not in the last 10 years), but at first
>>> sight it should allow you to profile different builds of svn.
>> Sure, but it requires to have the app built with purifyplus installed.
>> And my problem is that I can't do that with VC6 since I don't have it.
> For this kind of analysis I'd very strongly recommend Intel's VTune over
> Quantify. VTune is a sampling profiler that doesn't affect the programs
> execution speed much -- and thus leaves the interaction between program,
> runtime lib and network stack pretty much unchanged. Quantify is
> horrible on I/O bound tests because it totally changes all
> timing-related effects.

Thanks for the hint.
I've installed and tried both. I couldn't get much usable data from
both: it's not a CPU issue. The CPU usage stays at almost 0% during the
whole merge.
And I had to use a restore point to get rid of those tools again. I've
rarely seen such intrusive applications!

>> The delays happen because (at least on Windows) a 'connect' is
>> expensive. It seems that a build with VS2008 adds some more sanity
>> check code for those calls which makes those take a few miliseconds
>> longer than a build with VC6.
> Oh duh. A few extra milliseconds on modern hardware? What, are they
> doing a virus scan on the data? As if the networks stack on Windows
> wasn't already rotten enough.

My hardware is quite good:
T7500_at_2.20GHz, 4GB RAM

So that's definitely not an issue. Also, it doesn't help to rant about
the Windows network stack. If you like it or not, many people have to
live with it and are quite happy. Other applications can deal with it
well enough.


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Received on 2008-06-15 15:02:58 CEST

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