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Re: 1.6.2 poor commit performance with large data

From: Justin Johnson <ajustinjohnson_at_gmail.com>
Date: Thu, 4 Jun 2009 13:14:00 -0500

Is the leak only on Windows and only for commit?

Are the temp file performance issues new with 1.6?

I'm planning an enterprise deployment of Subversion/TortoiseSVN 1.6.2 and am
trying to determine the impact of moving forward with the deployment.

Thanks.
Justin

On Tue, Jun 2, 2009 at 12:31 PM, Mark Phippard <markphip_at_gmail.com> wrote:

> On Tue, Jun 2, 2009 at 1:24 PM, Bolstridge,
> Andrew<andy.bolstridge_at_intergraph.com> wrote:
> >> -----Original Message-----
> >> From: B Smith-Mannschott [mailto:bsmith.occs_at_gmail.com]
> >> Sent: Friday, May 29, 2009 11:27 AM
> >> To: Bolstridge, Andrew
> >> Cc: users_at_subversion.tigris.org
> >> Subject: Re: 1.6.2 poor commit performance with large data
> >>
> > [snip]
> >
> >> This sounds like the same problem as described in [this thread][1]
> >> from a few days ago. Said thread links to [Issue 1964][2] which looks
> >> like the same problem.
> >>
> >> [1]:
> >> http://subversion.tigris.org/ds/viewMessage.do?dsForumId=1065&dsMessage
> >> Id=2352720
> >> [2]: http://subversion.tigris.org/issues/show_bug.cgi?id=1964
> >>
> >> So far, evidence suggests that this issue crops up only under Windows.
> >> I haven't seen anything suggesting *why* this is the case, so any
> >> information you can provide is likely to be helpful.
> >>
> >
> >
> > I've had a look at this running again today. It seems to be throttled in
> the System process (not any of the sub-processes, so it must be a driver).
> On my quad-core box System.exe hits 25% CPU and stays there.
> > There is a lot of page faults (after transferring 73Mb, I've got 74
> million page faults with a delta of roughly 1000 per second).
> > Memory usage steadily (but very slowly) increases once the transfer has
> started to stall, currently showing 169Mb/164Mb in taskmanager.
> >
> > and then.... I had a brainwave. I turned off the virus checker and
> suddenly things went back to normal. (I use Trend which isn't quite so bad).
> The memory usage is still increasing at a rate of 1Mb per second but the
> page fault delta for System process has dropped to 0.
> >
> >
> > In the end, transferring 9500 mostly cpp source-code files (187Mb) used
> peak memory of 1.5Gb RAM.
> >
> > If anyone wants to check the 'leak', I made a heap comparison showing the
> allocations. I did this using TortoiseSVN (as that has some symbols),
> unfortunately it doesn't have enough symbols for the svn libraries or it'd
> be more useful. If anyone has built SVN for Windows, and will create some
> .pdb symbols, then I'd be happy to re-run my commits and see if I can find
> out more about this issue.
> >
> > It appears that the call to libapr_tsvn's apr_allocator_max_free_set is
> doing the damage, after transferring 130Mb (roughly 7000 files), it has
> 'leaked' 749Mb. I can’t see what has been calling it without some effort
> (and symbols) but maybe someone more knowledgeable of SVN source can offer
> some suggestions. It appears to mostly allocate 8k at a time, but
> occasionally allocates 16k (if that helps any).
> >
> > Be aware I've cross-posted this to the TortoiseSVN list too.
>
> The leak has been discovered and fixed and will be in 1.6.3. This
> also revealed that the way temp files are created is a cause of
> slowness. A fix for that is being looked at and will hopefully be in
> 1.6.3 as well.
>
> --
> Thanks
>
> Mark Phippard
> http://markphip.blogspot.com/
>
> ------------------------------------------------------
>
> http://tortoisesvn.tigris.org/ds/viewMessage.do?dsForumId=4061&dsMessageId=2358841
>
> To unsubscribe from this discussion, e-mail: [
> users-unsubscribe_at_tortoisesvn.tigris.org].
>

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Received on 2009-06-04 20:14:10 CEST

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