Rüdiger:

On Mon, Oct 7, 2019 at 3:51 PM Ruediger Pluem <rpl...@apache.org> wrote:

> On 10/07/2019 08:40 PM, Branko Čibej wrote:
> > On Mon, 7 Oct 2019, 19:47 Doug Robinson, <doug.robin...@wandisco.com
> <mailto:doug.robin...@wandisco.com>> wrote:
> >
> >     Folks:
> >
> >     I spoke with this user late last week.  They stated that they can
> only get approximately 400 parallel SVN operations
> >     before the "system time" consumes all available CPU for an 8-core
> machine.  Adding more cores won't help because of
> >     the nature of spin locks (it makes things worse).  Turns out that
> even with ~100 parallel SVN operations the "system
> >     time" starts becoming significant/measurable (~10%).  Both HTTP
> (mod_dav_svn) and "svnserve" protocols participate
> >     in the lock contention.
> >
> >     Your help would be greatly appreciated.
> >
> > Whew. So. Reducing this issue to "use a more efficient lock" is not
> going to work, and you provided far too little
> > information to even attempt a diagnosis. For starters, I recommend
> gathering as much info as possible (anonymised of
> > course) about the server configuration, everything from httpd an
> svnserve to the repository config and underlying
> > filesystem, if possible. Getting stack traces of the "stuck" threads
> would be necessary, too. Without knowing exactly
> > what is happening, these kinds of problems are extremely hard to
> understand, let alone fix.
>
> Plus depending on which part of the code requires this lock a different
> locking mechanism that might suit better for
> this use case can possibly be chosen via configuration changes (e.g. httpd
> allows this for most of its locking).
>

That would be awesome!  I'll definitely try to get those stack tracebacks.

Cheers.

Doug
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