MPICH P4 procgroup Files

If you are using MPICH with a P4 procgroup file (by using the -p4pg option), make sure you use the same absolute path name in your procgroup file and on the mpirun command line. If your procgroup file contains a different path name that resolves to the same executable, TotalView treats each name as a separate executable, which causes debugging problems.

The following example uses the same absolute path name on TotalView's command line and in the procgroup file:

% cat p4group
local 1 /users/smith/mympichexe
bigiron 2 /users/smith/mympichexe
% mpirun -p4pg p4group -tv /users/smith/mympichexe

In this example, TotalView:

1. Reads the symbols from mympichexe only once.
    
2. Places MPICH processes in the same TotalView share group.
    
3. Names the processes mypichexe.0, mympichexe.1, mympichexe.2, and mympichexe.3.

If TotalView assigns names such as mympichexe<mympichexe>.0, a problem occurred and you should check the contents of your procgroup file and mpirun command line.