Re: [Starpu-devel] starpu_data_unregister_submit() and MPI

[Nathalie Furmento <nathalie.furmento@labri.fr>]

I am able to reproduce the bug on one of our machines (conan) with Open MPI 
1.4.5.
Keeping the call to starpu_data_unregister_submit() indeed fails, however the
call to the unregister hook is made or not within the data_unregister() 
function.

Samuel, i tried to move the call to the unregister hook function at the 
beginning,
it does not solve the problem, it even seems to stuck the application at an 
earlier
stage.

Cheers,

Nathalie

On Mar 12, 17:55, Benoît Lizé wrote:
> An additional observation: on my machine, removing the
> starpu_data_unregister_submit() call solves the issue.
> 
> 
> On Wed, Mar 12, 2014 at 5:53 PM, Benoît Lizé <benoit.lize@gmail.com> wrote:
> 
> > Hello,
> >
> > Here is a small example that doesn't work. It is stuck when the node count
> > is not 1. I've tested it with OpenMPI 1.4.4 (very old, sorry about that) 
> > on
> > debian testing with StarPU r2389. It can be run with:
> > mpirun -np 2 xterm -geometry 160x100 -e gdb -ex run ./test
> >
> > It is however not stuck at the same step as my full program, I don't know
> > why. Of course it is entirely possible that I missed something elsewhere.
> >
> >
> >
> > On Wed, Mar 12, 2014 at 5:14 PM, Benoît Lizé <benoit.lize@gmail.com>wrote:
> >
> >> I haven't found the cause either.
> >> I will try to isolate a small test case that exhibits the issue and get
> >> back to you.
> >>
> >>
> >> On Wed, Mar 12, 2014 at 4:58 PM, Samuel Thibault <
> >> samuel.thibault@ens-lyon.org> wrote:
> >>
> >>> Benoît Lizé, le Wed 12 Mar 2014 11:02:03 +0100, a écrit :
> >>> > Here it is (with STARPU_NCPUS=1):
> >>>
> >>> Ok, I don't have any idea by just looking at the backtrace.
> >>>
> >>> Nathalie, was there any reason for calling the unregister hook so late?
> >>> It should rather go as soon as the beginning actually, so that the hook
> >>> operations are properly waited for by the rest of
> >>> _starpu_data_unregister.  I don't think it is the bug at stake, however.
> >>>
> >>> Benoît, would you have a simple example that triggers the bug?
> >>>
> >>> Samuel
> >>>
> >>
> >>
> >

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Dr Nathalie Furmento                         Ingénieur de recherche CNRS
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