[petsc-users] TSAdjoint "cannot locate function MatDenseGetColumn_C in object"

Hi PETSc devs, I'm writing some code that uses Tao to do variational data assimilation, and I get the following error message upon calling TaoSolve(): [0]PETSC ERROR: - Error Message -- [0]PETSC ERROR: No support for

Re: [petsc-users] MPI error for large number of processes and subcomms

Hi Junchao, I have no objection if you want to add the test code to the petsc repository. In the meantime, we will check out the changes you’ve made and let you know what we find. Thanks, Randy M. > On Apr 27, 2020, at 9:59 AM, Junchao Zhang wrote: > > Randy, >You are absolutely right.

Re: [petsc-users] MPI error for large number of processes and subcomms

Randy, You are absolutely right. The AOApplicationToPetsc could not be removed. Since the excessive communication is inevitable, I made two changes in petsc to ease that. One is I skewed the communication to let each rank send to ranks greater than itself first. The other is an option, -max_pen

Re: [petsc-users] Vec sizing using DMDA

Perfect, thank you very much! Best regards, Antoine De : Matthew Knepley Envoyé : 24 avril 2020 11:10 À : Antoine Côté Cc : petsc-users@mcs.anl.gov Objet : Re: [petsc-users] Vec sizing using DMDA On Fri, Apr 24, 2020 at 10:47 AM Antoine Côté mailto:antoine.co