With LAM 6.5 and XMPI 2.2.3b8 (and above),
functionality was added to
enhance the usability of XMPI. MPI_Comm_set_name() now
affects the name displayed in XMPI. The other change is the addition
of "buoys" to XMPI. This change requires special functionality
provided in LAM, and may result in a program that is not compatible
with other MPI implementations.
XMPI now provides the ability to identify points in user applications
through the use of "buoys". Buoys are identifiers that are "dropped"
to identify that point on the XMPI trace window. For example, the
code below:
#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);
XMPI_Buoy("I'm alive");
MPI_Finalize();
return 0;
}
will produce the following trace visualization when run on 4 ranks:
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