Hi, I am trying to solving AX=lambda BX
A and B are of size 57000 x 57000 Currently I solve my small matrices using -st_type sinvert and -eps_nev 1 So I get 1 eigenvalue and eigenvector. So for the 57000x57000 large matrix problem, the unknown eigenvector is 57000x1 Should I configure the petsc as '--with-64-bit-indices=1' for this problem ? Is the unknowns being considered as the entire eigenspace 57000x57000 ? kindly let me know. Venkatesh
