Thank you. So the single eigenvector's size which is Nx1 is the number of unknowns and should be less than 2^31-1 so as to avoid configuring with '--with-64-bit-indices=1' ??
On Sat, May 16, 2015 at 8:05 PM, Matthew Knepley <[email protected]> wrote: > On Sat, May 16, 2015 at 3:49 AM, venkatesh g <[email protected]> > wrote: > >> 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 ? >> > > It is not necessary. > > Matt > > >> Is the unknowns being considered as the entire eigenspace 57000x57000 ? >> >> kindly let me know. >> >> Venkatesh >> > > > > -- > 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 >
