I have a 2d resistive mhd code which spends over 95 percent of its run time doing linear solves and I have interfaced these linear solves to petsc. I'm interested in optimizing the single node performance of this code right now and was wondering if there could be any benefit to trying out the petsc pthreads capability that is in petsc-dev. Is this work at a stage yet where I might be able to benefit from trying it with my code when running on a multi-core cpu? Thanks, Dave -- Dave Nystrom phone: 505-661-9943 (home office) 505-662-6893 (home) skype: dave.nystrom76 email: [email protected] smail: 219 Loma del Escolar Los Alamos, NM 87544