Re: [Boost-users] MPICH2 + Boost.MPI Collective Problems

Subject: Re: [Boost-users] MPICH2 + Boost.MPI Collective Problems
From: Stephan Hackstedt (stephan.hackstedt_at_[hidden])
Date: 2010-08-21 03:45:13

I found out , that when i use a send -> recv communication on the nodes,
before calling communicator::barrier, it works. maybe calling the point to
point operatrion before the collective synchronizises both prozesses?
Now i need a solution for using communicator::barrier as first call.

Stephan

2010/8/20 Stephan Hackstedt <stephan.hackstedt_at_[hidden]>

> Hi there,
>
> i have a big problem by running MPI programs which use the Boost.MPI
> library. When i'm trying to run programs on *more *than one node,
> collective operations like communicator::barrier<http://boost.org/doc/libs/1_44_0/doc/html/boost/mpi/communicator.html#id918378-bb>or
> broadcast,<http://boost.org/doc/libs/1_44_0/doc/html/boost/mpi/broadcast.html>or even the
> environment<http://boost.org/doc/libs/1_44_0/doc/html/boost/mpi/environment.html>destructor (cause of FINALIZE, which is colletive) causing the programm to
> crash. I got errors like this :
>
> *[1]terminate called after throwing an instance of
> 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::mpi::exception>
> >'
>
> [1]  what():  MPI_Barrier: Other MPI error, error stack:
> [1]PMPI_Barrier(362).................: MPI_Barrier(MPI_COMM_WORLD) failed
> [1]MPIR_Barrier_impl(255)............:
> [1]MPIR_Barrier_intra(79)............:
> [1]MPIC_Sendrecv(186)................:
> [1]MPIC_Wait(534)....................:
> [1]MPIDI_CH3I_Progress(184)..........:
> [1]MPID_nem_mpich2_blocking_recv(895):
> [1]MPID_nem_tcp_connpoll(1746).......: Communication error with rank 0: *
>
> I also tested this with the simple broadcast example from the Boost.MPI
> tutorial - same errors..
> But when using the original MPI equivalent without the Boost.MPI library,
> such as MPI_Barrier<http://www.mpi-forum.org/docs/mpi-11-html/node66.html#Node66>,
> the programm runs well. I am using MPICH2 on Ubuntu 10.04 platforms.
> Someone had problems like this or know a fix for that?
>
> Regards,
>
> stephan
>
>
>