Re: [Boost-users] [BGL] Segmentation fault with parallel BGL

Subject: Re: [Boost-users] [BGL] Segmentation fault with parallel BGL
From: Marcin Zalewski (marcin.zalewski_at_[hidden])
Date: 2015-11-02 09:21:17

Is it possible to get a stack trace? Also, have you tried any of the other
things I suggested?

On Mon, Nov 2, 2015 at 8:48 AM Quaglino Alessio <alessio.quaglino_at_[hidden]>
wrote:

> Thanks for the reply. I am getting a seg fault even with nV=1..
>
> Alessio
>
>
>
> On 02 Nov 2015, at 13:50, Marcin Zalewski <marcin.zalewski_at_[hidden]>
> wrote:
>
>
> On Nov 2, 2015 6:55 AM, "Quaglino Alessio" <alessio.quaglino_at_[hidden]>
> wrote:
> >
> > Is anyone using the parallel BGL? The following code gives me a
> segmentation fault for the parallel case but I can’t figure out what can be
> wrong. You can replace PetscInitialize and PetscFinalize with the
> respective standard MPI calls.
>
> Could you try with fewer vertices (just a few) and see if this still
> happens? If it does, can you try to add some edges and see if it makes a
> difference? A couple more things to try is to use a single MPI process and dummy_property_map.
> See if any of these steps make a difference.
>
> > Regards,
> > Alessio Quaglino
> >
> >
> > #define PARALLEL_GRAPH
> >
> > using namespace boost;
> > using boost::graph::distributed::mpi_process_group;
> >
> > typedef adjacency_list <vecS, vecS, undirectedS> SerialGraph;
> > typedef adjacency_list<vecS, distributedS<mpi_process_group, vecS>,
> undirectedS> Graph;
> > typedef iterator_property_map<std::vector<int>::iterator,
> property_map<Graph, vertex_index_t>::type> LocalMap;
> >
> > static char help[] = "";
> >
> > int main(int argc,char **args)
> > {
> >     PetscErrorCode ierr;
> > PetscInitialize(&argc,&args,(char*)0,help);
> >
> >
> >
> >     int nV = 40000;
> >     int num = 0;
> >
> >
> >
> > #ifdef PARALLEL_GRAPH
> >     Graph G(nV+1);
> >     synchronize(G);
> >     std::vector<int> localComponent(nV+1);
> >     LocalMap components(localComponent.begin(),get(vertex_index, G));
> >     num = connected_components_ps(G, components);
> > #else
> >     SerialGraph G(nV+1);
> >     std::vector<int> globalComponent(nV+1);
> >     num = connected_components(G, &globalComponent[0]);
> > #endif
> >
> >
> >
> >     std::cout << num << " connected components" << std::endl;
> >
> >
> >
> > ierr = PetscFinalize();
> > return 0;
> > }
> >
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
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