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Subject: Re: [OMPI devel] VampirTrace and MPI_Init_thread()
From: George Bosilca (bosilca_at_[hidden])
Date: 2010-08-10 21:59:10


Lisandro,

Thanks for the report. I quickly checked the Open MPI source code and the .so library and both show the existence of both MPI_Init_thread and PMPI_Init_thread symbols.

0000000000031b60 T _MPI_Init_thread
000000000005e7c0 T _PMPI_Init_thread

I CC'ed the VT folks.

  Thanks,
    george.

On Aug 10, 2010, at 20:59 , Lisandro Dalcin wrote:

> Below you have C program that will MPI_Init_thread()
>
> $ cat demo/helloworld.c
> #include <mpi.h>
> #include <stdio.h>
>
> int main(int argc, char *argv[])
> {
> int provided;
> int size, rank, len;
> char name[MPI_MAX_PROCESSOR_NAME];
>
> MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
>
> MPI_Comm_size(MPI_COMM_WORLD, &size);
> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
> MPI_Get_processor_name(name, &len);
>
> printf("Hello, World! I am process %d of %d on %s.\n", rank, size, name);
>
> MPI_Finalize();
> return 0;
> }
>
>
> Now I build like this:
>
> $ mpicc-vt demo/helloworld.c
>
> and then try to run it:
>
> $ ./a.out
> Hello, World! I am process 0 of 1 on trantor.
> [trantor:18854] *** An error occurred in MPI_Group_free
> [trantor:18854] *** on communicator MPI_COMM_WORLD
> [trantor:18854] *** MPI_ERR_GROUP: invalid group
> [trantor:18854] *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort)
>
> However, if MPI_Init() is used, it succeeds.
>
> It seems the MPI_Init_thread() wrapper to PMPI_Init_thread() is
> missing, see this:
>
> $ nm a.out | grep MPI_Init
> 0805c4ef T MPI_Init
> U MPI_Init_thread
> U PMPI_Init
>
>
> PS: Sorry if this is actually a VT bug. I'm not a VT user, I'm just
> reporting this issue (related to a mpi4py bug report that arrived at
> my inbox months ago).
>
> --
> Lisandro Dalcin
> ---------------
> CIMEC (INTEC/CONICET-UNL)
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