Pros of PVM

The PVM programming model is clean
PVM is free and easily obtained via electronic mail
PVM is easy to install, learn, and use
PVM is small and portable across Unix compatible machines and some multiprocessors
Fortran is supported
The source codes are available
A graphical environment is available:
- HeNCE, Heterogeneous Network Computing Environment
- Automatic generation of PVM code
- Programmer specifies parallelism by drawing a directed acyclic graph that represents the logical structure of the program
- It is impossible to describe some algorithms