Re: [petsc-users] GAMG Parallel Performance

2018-11-15 Thread Smith, Barry F. via petsc-users
> On Nov 15, 2018, at 1:02 PM, Mark Adams wrote: > > There is a lot of load imbalance in VecMAXPY also. The partitioning could be > bad and if not its the machine. > > On Thu, Nov 15, 2018 at 1:56 PM Smith, Barry F. via petsc-users > wrote: > > Something is odd about your

Re: [petsc-users] GAMG Parallel Performance

2018-11-15 Thread Mark Adams via petsc-users
There is a lot of load imbalance in VecMAXPY also. The partitioning could be bad and if not its the machine. On Thu, Nov 15, 2018 at 1:56 PM Smith, Barry F. via petsc-users < petsc-users@mcs.anl.gov> wrote: > > Something is odd about your configuration. Just consider the time for > VecMAXPY

Re: [petsc-users] GAMG Parallel Performance

2018-11-15 Thread Smith, Barry F. via petsc-users
Something is odd about your configuration. Just consider the time for VecMAXPY which is an embarrassingly parallel operation. On 1000 MPI processes it produces Time

Re: [petsc-users] GAMG Parallel Performance

2018-11-15 Thread Matthew Knepley via petsc-users
On Thu, Nov 15, 2018 at 11:52 AM Karin via petsc-users < petsc-users@mcs.anl.gov> wrote: > Dear PETSc team, > > I am solving a linear transient dynamic problem, based on a discretization > with finite elements. To do that, I am using FGMRES with GAMG as a > preconditioner. I consider here 10 time

[petsc-users] GAMG Parallel Performance

2018-11-15 Thread Karin via petsc-users
Dear PETSc team, I am solving a linear transient dynamic problem, based on a discretization with finite elements. To do that, I am using FGMRES with GAMG as a preconditioner. I consider here 10 time steps. The problem has round to 118e6 dof and I am running on 1000, 1500 and 2000 procs. So I have