Hi Cody, This sounds like the mesh data keeps a copy on each processor, but the matrices and vectors are still stored distributedly. is it correct?
I have a 3D stokes problem with 60x60x60 mesh, 2nd order element for velocity u,v,w, and first order for pressure p. Totally about 2.9M dofs. This can run with 1, 2 and 3 CPUs. However, if I use 4 CPUs, the program crashed with segmentation fault as follows: If I run a smaller system, e.g. 25x25x25, it still works for 4 CPUs. Do you think this is caused by memory due to the mesh duplication? ==================================================================================== BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES = PID 23903 RUNNING AT b461 = EXIT CODE: 9 = CLEANING UP REMAINING PROCESSES = YOU CAN IGNORE THE BELOW CLEANUP MESSAGES =================================================================================== YOUR APPLICATION TERMINATED WITH THE EXIT STRING: Killed (signal 9) This typically refers to a problem with your application. Please see the FAQ page for debugging suggestions On Wed, Jun 8, 2016 at 4:17 PM, Cody Permann <codyperm...@gmail.com> wrote: > That's right! > > This is the classic space versus time tradeoff. In the bigger scheme of > things, using a little more memory is usually fine on a modern system. The > SerialMesh (now called ReplicatedMesh) is quite a bit faster. I think the > general consensus is: use ReplicatedMesh until you are truly memory > constrained AND you know that the bulk of the memory is in your mesh and > not your matrices and vectors and everything else. > > Cody > > On Wed, Jun 8, 2016 at 2:40 PM Xujun Zhao <xzha...@gmail.com> wrote: > >> Hi all, >> >> I am curious about SerialMesh running with multiple CPUs. If I have 1 node >> with 16 cores on the cluster. Will "mpirun -n 16" lead to 16 copies of >> SerialMesh? If so, it looks like running on multiple CPUs will require >> more >> memory?? >> >> Thanks. >> Xujun >> >> ------------------------------------------------------------------------------ >> What NetFlow Analyzer can do for you? Monitors network bandwidth and >> traffic >> patterns at an interface-level. Reveals which users, apps, and protocols >> are >> consuming the most bandwidth. Provides multi-vendor support for NetFlow, >> J-Flow, sFlow and other flows. Make informed decisions using capacity >> planning reports. >> https://ad.doubleclick.net/ddm/clk/305295220;132659582;e >> _______________________________________________ >> Libmesh-users mailing list >> Libmesh-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/libmesh-users >> > ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
