[Bf-committers] Bledner 2.5 - futex problem

[Jacob Heller]

Okay, interesting and again, I'm not an expert.  I'm much better at
describing symptoms than diagnosing.  I can say that something is certainly
wrong.  I haven't thoroughly tested the latest SVN commits (this happened a
week or two ago), maybe it was fixed?

On Mon, Aug 3, 2009 at 8:22 AM, Nathan Letwory <jesterking at letwory.net>wrote:

> Jacob Heller wrote:
> > Has anyone else experienced problems associated with the futex system in
> > 2.5?  When using blender, it will lock-up at seemingly random moments.
> > I haven't found any particular pattern as to what makes it freeze and it
> > usually happens after 2-10 minutes of using it, but I've gone 45 minutes
> > at some points before it happens.  Absolutely nothing responds when it
> > freezes, not even the "close" button at the top of the window.
> >
> > Interestingly, Ubuntu will not even give me the "This window looks like
> > it's frozen, press here to force quit" dialogue.  I have to go the
> > system monitor and kill the task.  Looking at the System Monitor when it
> > happens, under "Waiting channel" it always says "futex_wait" which leads
> > me to believe it has to do with blender's mutex/futex system.  I'm no
> > expert at this, but it seems like the multithreading system is mutually
> > locking any of blender's processes from proceeding.  Blender will not
> > consume any CPU resources when it freezes.
>
> I'm not sure if I'm the right person to answer here, but at least for
> the sake of not having this thread get lost in the bithistory of the ML.
> Anyway, from what I know, we don't use any futexes explicitely. I don't
> know if pthreads on Linux does something behind the scenes to play with
> those...
>
> Maybe some hardcore Linux user under our developers can have a peek into
> this and maybe shed some light on this? GSR maybe?
>
> /Nathan
>
> >
> > I have confirmed this on two different systems.  Below are the specs:
> >
> > Pentium Quad Core Q6600, 2.4 GHz
> > 4 Gb RAM
> > Nvidia 9800 GT
> > Ubuntu Linux, 64 Bit
> >
> > Centrino Dual Core, 2.0 Ghz
> > 2 Gb RAM
> > Nvidia 7900 Go
> > Ubuntu Linux, 32 Bit
> >
> > -Jake
> >
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>
> --
>
> Nathan Letwory
>
> http://www.planetblender.org | http://www.blender-fi.org
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