Hi, I'm wondering what's wrong in my code. I'm using PETSc to solve a linear system, and willing to use a multi-processor computer. 9 years ago, I used petsc-2.1.3 with success. Few weeks ago, I've update petsc with the 3.1-p8 version and made the necessary changes to work with. No problem. And recently, I've migrate to petsc-3.2-p5. Compilation is OK. But when I do simulation, now, I have some PETSC-ERROR in the log file, even using only one processor (see the out.log file in this email). However, I think I defined MatMPI and VecMPI correctly, according to the doc. The log file tell that something wrong with the nnz which should not be greater than row length (??). I can't see what's wrong.
And also, with the previous version of PETSc I've used, the were no problem using -pc_type bjacobi and -sub_pc_type sor, juste to solve linear system doing parallel computations and because SOR is not parallelized. But now, when I use -pc_type bjacobi and -sub_pc_type sor, with 3 rank, I experiment some convergence problem during my simulation. I'd really like to calculate in parallel because of, in further time, with the 2.1.3 petsc version, with a cluster and a myrinet switch, I obtained some interesting results in terme of performance (that time, the more number of processors I used, the faster the calculations were). But now, with the new architecture-PC (2 quad core processors, and no switch of course, all is in the same computer), each time I do the simulation with one more processor, I lost time). Any idea of what's wrong ? I would appreciate some help in that purpose Best Regards. John -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111123/723b3432/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: out.log Type: application/octet-stream Size: 8583 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111123/723b3432/attachment.obj>
