[petsc-users] What are the differences between ex11.c and ex11_sa.c

[leejearl]

Hello, Petsc developer:

     I find two files ex11.c and ex11_sa.c in the directory of 
"/petsc/src/ts/examples/tutorials".

Can you tell me what are the differences between them? What is the 
meaning of the “suffix”?

    Thanks！

leejearl