5.2   Three steps in debugging PVM programs

1. Run, if possible, the program on a single process
   
   Debug as any other serial program
   
   Catch error unrelated to parallelism
   
   
2. Run the program using 2-4 processes on a single machine
   
   Check the communication syntax and logic (tag...)
   
   
3. Run the same program on a 2-4 processes across several machines
   
   Check for synchronization errors produced by the networks delay