Hi, I am using reduced basis for my work. The number of Aq matrices in my problem is very large (~250). Because of this, the memory requirements of my program are ~200 times the mesh-file size. I did some memory usage study and found out that the allocate_data_structures() function in RBConstruction is responsible for most of the memory usage.
I think this might be due to the large number of Petsc sparse matrices being constructed. Each Aq matrix is known to have non-zero entries corresponding to only a small sub-domain of the geometry. All these sub-domains are separate blocks in the mesh. I get the feeling that for each sparse matrix memory is being allocated even for the zero entries. I saw that Petsc has an option MAT_IGNORE_ZERO_ENTRIES. How does one pass this in libMesh? Please note that I am not using libMesh directly. My code is a MOOSE app, and I am using the RB functionality of the underlying libmesh code. Best regards, Nikhil _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
