PETSc System routines

PETSc provides a variety of "system" level routines, including parallel file access, synchronized printing to screen.

ex1.c: Introductory example that illustrates printing
ex2.c: Synchronized printing
ex3.c: Augmenting PETSc profiling by add events
ex5.c: Demonstrates using the PetscBag Object\n\n
makefile