On 15/6/2012 9:04 PM, Jed Brown wrote: > If you need corner points, use DMDA_STENCIL_BOX.
Sorry? I don't mean corner points, but points to the east of the east cell, or the west of the west cell ie. instead of only 1 ghost cell to the east of the boundary, I need 1 more which is east of the east cell. > > On Fri, Jun 15, 2012 at 7:58 PM, TAY wee-beng <zonexo at gmail.com > <mailto:zonexo at gmail.com>> wrote: > > Hi, > > I'm trying to implement DM in my code. So far, I found that it is > very convenient to use its features. I am currently using DMDA > STENCIL STAR. > > However, in some parts of my code, I need to update ghost points > at east east, west west etc. > > DMGlobalToLocalBegin/end can only update east, west etc. What's > the easiest way to update these additional points? Do I have to > use MPI_Send? > > Also, how is the memory allocated? I think the east east values > will be outside the local vector, is that so? > > Thank you. > > -- > Yours sincerely, > > TAY wee-beng > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120615/d29b1b4c/attachment.html>
