Re: [petsc-users] MatMPIAIJSetPreallocation question

> On Aug 4, 2017, at 2:52 PM, Xiangdong wrote: > > Hello everyone, > > I have a quick questions on the MatMPIAIJSetPreallocation. If we do not pass > the exact number of nonzeros for o_nnz and d_nnz, (for example, > MAT_INFO_NZ_ALLOCATED is 50% more than

Re: [petsc-users] DMPlex distribution with custom adjacency

Coming back to this after a while. It would still be good if I could provide a callback for user-defined adjacency. Does https://bitbucket.org/petsc/petsc/pull-requests/690/plex-support-user-defined-adjacencies-via/diff

[petsc-users] MatMPIAIJSetPreallocation question

Hello everyone, I have a quick questions on the MatMPIAIJSetPreallocation. If we do not pass the exact number of nonzeros for o_nnz and d_nnz, (for example, MAT_INFO_NZ_ALLOCATED is 50% more than MAT_INFO_NZ_USED), will the performance of MatMult be affected? What effect will these allocated but

Re: [petsc-users] DMPlex distribution with custom adjacency

On Fri, Aug 4, 2017 at 9:37 AM, Lawrence Mitchell < lawrence.mitch...@imperial.ac.uk> wrote: > > > On 6 Jun 2017, at 09:01, Lawrence Mitchell ac.uk> wrote: > > > >> If you do really want to prune them, then I guess overriding the > DMPlexGetAdjacency() as you

Re: [petsc-users] DMPlex ghost cells

On Thu, Aug 3, 2017 at 10:52 PM, Adrian Croucher wrote: > Would it also work if I just didn't use DMPlexGetHybridBounds() to > differentiate between partition ghost cells and boundary ghost cells, but > instead checked the value of the "ghost" DMLabel? > Yes. Matt

Re: [petsc-users] DMPlex distribution with custom adjacency

> On 6 Jun 2017, at 09:01, Lawrence Mitchell > wrote: > >> If you do really want to prune them, then I guess overriding the >> DMPlexGetAdjacency() as you propose is probably the best way. I would >> be willing to put it in. Please send me a reminder email