> On May 22, 2019, at 2:26 PM, Sajid Ali via petsc-users > <petsc-users@mcs.anl.gov> wrote: > > Hi Hong, > > Looks like this is my fault since I'm using -ksp_type preonly -pc_type gamg. > If I use the default ksp (GMRES) then everything works fine on a smaller > problem. > > Just to confirm, -ksp_type preonly is to be used only with direct-solve > preconditioners like LU,Cholesky, right ? You can use it any time you like but it only applies the preconditioner; thus unless your preconditioner is a really good approximation to the operator it won't give you much information. > > Thank You, > Sajid Ali > Applied Physics > Northwestern University
Re: [petsc-users] Question about TSComputeRHSJacobianConstant
Smith, Barry F. via petsc-users Wed, 22 May 2019 13:03:15 -0700
- Re: [petsc-users] Question about TSCompute... Sajid Ali via petsc-users
- Re: [petsc-users] Question about TSCo... Zhang, Hong via petsc-users
- Re: [petsc-users] Question about TSCo... Smith, Barry F. via petsc-users
- Re: [petsc-users] Question about ... Sajid Ali via petsc-users
- Re: [petsc-users] Question ab... Zhang, Hong via petsc-users
- Re: [petsc-users] Questio... Sajid Ali via petsc-users
- Re: [petsc-users] Questio... Sajid Ali via petsc-users
- Re: [petsc-users] Questio... Smith, Barry F. via petsc-users
- Re: [petsc-users] Questio... Sajid Ali via petsc-users
- Re: [petsc-users] Questio... Smith, Barry F. via petsc-users
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