Am Dienstag, den 30.08.2011, 10:08 -0600 schrieb John Peterson: > On Tue, Aug 30, 2011 at 9:56 AM, robert <[email protected]> wrote: > > > > The mesh.uniformly_refine(1) takes some minutes when I do it in serial > > on my PC. However, on the BlueGene/P it doesn't come to an end (I > > aborted after 15 min). Do I have to prepare my mesh in a special way for > > use in parallel? One thing I have tried was to call the > > prepare_for_use() before the refinement. I thought this makes sense > > because the mesh is partitioned before. But, the problem remains. > > Your mesh is serial unless you specifically compiled libmesh with > --enable-parmesh.
Ok, but nevertheless it shouldn't be slower than on my PC, or am I wrong? Would this option just work with the existing code or do I have to change to ParallelMesh? > > What this means is that the mesh data structure (and any refinements, > etc.) is duplicated on all processors -- convenient for writing code, > not great for conserving memory. > > And it's particularly bad on multicore shared memory architectures: > you will have one copy of the mesh per MPI process, typically that > means one per core. > > > Mesh Information: > > Mesh Information: > > mesh_dimension()=3 > > spatial_dimension()=3 > > n_nodes()=447273 > > n_local_nodes()=447273 > > n_elem()=2994336 > > n_local_elem()=2994336 > > n_active_elem()=2661632 > > n_subdomains()=2 > > n_processors()=1 > > processor_id()=0 > > You may be going into swap depending on how little memory is available > per core on this machine, but 3M elements isn't particularly huge.... > so > > .) How much memory do you have per core? – SMP mode : 4 GB of physical memory available to the MPI task running on each node (4 cores/node) For testing and learning I only use a partition of 32 nodes. > .) What is going on in 'top' or the equivalent on BGL when your code is > running? What do you mean by this? Excuse my question - I am just not the most experienced person with computers. ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
