[petsc-users] Questions abt DM and DMDALocalToLocalBegin / End

[TAY wee-beng]

Hi,

I have questions abt DM and DMDALocalToLocalBegin / End.

I have 3 dof for u,v,w using DMDACreate3d.

Currently I'm using the topology of DM to help update the ghost values 
on each processor.

I found that to update the ghost values, I only need to use 
DMDALocalToLocalBegin / End.

Is this so?

Initially, I was using :

DMLocalToGlobalBegin / End and then

DMGlobalToLocalBegin / End.

Another thing is updating ghost values of only a single variable e.g. u.

Is that possible if my DMDACreate3d has 3 dof u,v,w?

Or must I create DMDACreate3d with only 1 dof u?



-- 
Thank you.

Yours sincerely,

TAY wee-beng