On Oct 2, 2015, at 2:21 PM, Dahai Guo <dahaiguo2...@yahoo.com> wrote:
>
> Is there any way to trace open mpi internal function calls in a MPI user
> program?
Unfortunately, not easily -- other than using a debugger, for example.
> If so, can any one explain it with an example? such as helloworld? I build
> open MPI with the VampirTrace options, and compile the following program with
> picc-vt,. but I didn't get any tracing info.
Open MPI is a giant state machine -- MPI_INIT, for example, invokes slightly
fewer than a bazillion functions (e.g., it initializes every framework and many
components/plugins).
Is there something in particular that you're looking for / want to know about?
> Thanks
>
> D. G.
>
> #include <stdio.h>
> #include <mpi.h>
>
>
> int main (int argc, char **argv)
> {
> int rank, size;
>
> MPI_Init (&argc, &argv);
> MPI_Comm_rank (MPI_COMM_WORLD, &rank);
> MPI_Comm_size (MPI_COMM_WORLD, &size);
> printf( "Hello world from process %d of %d\n", rank, size );
> MPI_Barrier(MPI_COMM_WORLD);
> MPI_Finalize();
> return 0;
> }
>
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> Link to this post:
> http://www.open-mpi.org/community/lists/devel/2015/10/18125.php
--
Jeff Squyres
jsquy...@cisco.com
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