<div dir="ltr"><div><div><div><div>Hello,<br><br></div>I've noticed the create function PetscViewerCreate_Binary() doesn't appear to be using the options prefix attached to the PetscViewer.<br></div><div>Specifically, I see on line 1276 of <br>  petsc-3.5.2/src/sys/classes/viewer/impls/binary/binv.c<br>the following<br>  ierr = PetscOptionsGetBool(NULL,"-viewer_binary_mpiio",&useMPIIO,NULL);CHKERRQ(ierr);<br><br></div><div>Is this an oversight or something intentional?<br></div><div><br></div>Are PetscViewers in general behaving such that they cannot be configured independently of each other if<br></div>PetscViewerSetOptionsPrefix() and PetscViewerSetFromOptions() are called?<br><br><br>Cheers<br></div>  Dave<br></div>