ex1.c: Introductory example that illustrates printing
ex2.c: Synchronized printing
ex3.c: Augmenting PETSc profiling by add events
ex4.c: Introductory example that illustrates running PETSc on a subset of processes
ex5.c: Demonstrates using the PetscBag Object\n\n
ex6.c: Example of using PetscLikely() and PetscUnlikely()
ex9.c: Example for PetscOptionsInsertFileYAML\n
ex11.c: Demonstrates PetscDataTypeFromString()
makefile