[petsc-users] Recommended processors according to problem size for good scaling

Hi, Is there a recommended no. of unknowns for each processor for good scaling? Supposed I have 1 million unknowns (cells), how many processors should I use? I remember reading that 50k unknowns per procs is a good choice. Is that true? -- Thank you. Yours sincerely, TAY wee-beng

Re: [petsc-users] Recommended processors according to problem size for good scaling

Hi, I assume you have read http://www.mcs.anl.gov/petsc/documentation/faq.html#computers As a rule of thumb, 50k cells is a reasonable lower limit. It really depends a lot on your interconnect, the dimensionality of your problem (2d vs. 3d, ratio of 'surface' to 'volume' of the cell batch),

Re: [petsc-users] PetscBool in PETSc 3.1? (Ubuntu Precice)

> On Oct 25, 2015, at 11:40 AM, Florian Lindner wrote: > > Hello, > > our build system Travis uses the old Ubuntu Precice Pangolin version that > comes with PETSc 3.1. > > While trying to activate petsc for our CI tests, I get the message that the > type PetscBool

Re: [petsc-users] PetscBool in PETSc 3.1? (Ubuntu Precice)

On Sun, Oct 25, 2015 at 11:40 AM, Florian Lindner wrote: > Hello, > > our build system Travis uses the old Ubuntu Precice Pangolin version that > comes with PETSc 3.1. > > While trying to activate petsc for our CI tests, I get the message that > the type PetscBool wasn't

[petsc-users] PetscBool in PETSc 3.1? (Ubuntu Precice)

Hello, our build system Travis uses the old Ubuntu Precice Pangolin version that comes with PETSc 3.1. While trying to activate petsc for our CI tests, I get the message that the type PetscBool wasn't found. I downloaded http://packages.ubuntu.com/precise/libpetsc3.1-dev and grepped for