[petsc-users] How to activate the modified Gram-Schmidt orthogonalization process in Fortran?

[Zhuo Chen]

Dear Petsc users,

I found an ancient thread discussing this problem.

https://lists.mcs.anl.gov/pipermail/petsc-users/2011-October/010607.html

However, when I add

call KSPSetType(ksp,KSPGMRES,ierr);CHKERRQ(ierr)
call
PetscOptionsSetValue(PETSC_NULL_OPTIONS,'-ksp_gmres_modifiedgramschmidt','1',ierr);CHKERRQ(ierr)

the program will tell me

WARNING! There are options you set that were not used!
WARNING! could be spelling mistake, etc!
There is one unused database option. It is:
Option left: name:-ksp_gmres_modifiedgramschmidt value: 1

I would like to know the most correct way to activate the modified
Gram-Schmidt orthogonalization process in Fortran. Thank you very much!

Best regards.




-- 
Zhuo Chen
Department of Physics
University of Alberta
Edmonton Alberta, Canada T6G 2E1
http://www.pas.rochester.edu/~zchen25/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20200910/586d31b6/attachment.html>