[petsc-users] [beginner question] Different communicators in the two objects: Argument # 1 and 2 flag 3!

[Jed Brown]

Niklas Fischer <niklas at niklasfi.de> writes:
> About the MPI output: I have asked the system administrator about this, 
> and he is of the oppinion that everything is as it should be. 

Fire the sysadmin? ;-)

> Initially, I found the messages concerning as well, but all they are
> really saying is that MPI defaults to using a slower link to exchange
> messages.

If that network interface is intentional, it should be set as the
default so that every run doesn't spam you with this stuff.  The ABI
version warning is another possible problem.  Even if the program
ultimately runs correctly, spewing these warnings is not "as it should
be".
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