PetscOptionsPushCreateViewerOff

sets if PetscOptionsCreateViewer(), PetscOptionsViewer(), and PetscOptionsCreateViewers() return viewers.

Synopsis

#include "petscviewer.h" 
PetscErrorCode PetscOptionsPushCreateViewerOff(PetscBool flg)

Logically Collective

Input Parameter

• flg - PETSC_TRUE to turn off viewer creation, PETSC_FALSE to turn it on.

Options Database Key

• -viewfromoptions (on|off) - Enable or disable PetscOptionsCreateViewer() and XXXViewFromOptions() calls, for applications with many small solves turn this off

Note

Calling XXXViewFromOptions in an inner loop can be expensive. This can appear, for example, when using many small subsolves. Call this function to control viewer creation in PetscOptionsCreateViewer(), thus removing the expensive XXXViewFromOptions calls.

Developer Notes

Instead of using this approach, the calls to PetscOptionsCreateViewer() can be moved into XXXSetFromOptions()

See Also

Viewers: Looking at PETSc Objects, PetscOptionsCreateViewer(), PetscOptionsPopCreateViewerOff()

Level

developer

Location

src/sys/classes/viewer/interface/viewreg.c

---

Index of all Viewer routines
Table of Contents for all manual pages
Index of all manual pages