PETSc System routines

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

ex1.c:
ex2.c:
ex3.c: Tests catching of floating point exceptions
ex9.c:
ex10.c:
ex11.c: Tests PetscSynchronizedPrintf() and PetscSynchronizedFPrintf()
ex12.c: Tests timing PetscSortInt()
ex14.c:
ex15.c:
ex16.c:
ex18.c: Tests ContainerCreate and ContainerDestroy
makefile