On Sat, Nov 17, 2012 at 10:50 AM, David Fuentes <fuentesdt at gmail.com> wrote: > Hi, > > I'm using petsc 3.3p4 > I'm trying to run a nonlinear SNES solver on GPU with gmres and jacobi PC > using VECSEQCUSP and MATSEQAIJCUSP datatypes for the rhs and jacobian matrix > respectively. > When running top I still see significant CPU utilization (800-900 %CPU) > during the solve ? possibly from some multithreaded operations ? > > Is this expected ? > I was thinking that since I input everything into the solver as a CUSP > datatype, all linear algebra operations would be on the GPU device from > there and wasn't expecting to see such CPU utilization during the solve ? > Do I probably have an error in my code somewhere ?
We cannot answer performance questions without -log_summary Matt > Thanks, > David -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener
