Hi, While reading the link you gave, I have seen a strange sentence;
"Otherwise you will get strange crashes." can someone explain it why? On Sun, May 17, 2015 at 12:16 PM, Jose E. Roman <[email protected]> wrote: > http://www.mcs.anl.gov/petsc/documentation/faq.html#with-64-bit-indices > > > > El 17/05/2015, a las 09:02, venkatesh g escribió: > > > 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 > > > >
