Hitchhiker's Guide

What happens when I compile my applications?

In order to run your program in parallel, you first need to compile your application source code with one of the following scripts:

1. mpcc
2. mpcc_r
3. mpCC
4. mpCC_r
5. mpxlf
6. mpxlf_r
7. mpxlf95
8. mpxlf95_r
9. mpxlf90
10. mpxlf90_r

To make sure the parallel execution works, these scripts add the following to your application executable:

• POE initialization module, so POE can determine that all nodes can communicate successfully, before giving control to the user application's main() routine.
• Signal handlers, for additional control in terminating the program during parallel tracing, and enabling the handling of the process termination signals. The IBM Parallel Environment for AIX: MPI Programming Guide explains the signals that are handled in this manner.

The compile scripts dynamically link the Message Passing library interfaces in such a way that the specific communication library that is used is determined when your application executes.

If you create a static executable, the application executable and the message passing libraries are statically bound together.