In parallel (12 processes minimum), so it should work :) Thanks a lot, Daniel
Dne 8.11.2010 11:22, Jed Brown napsal(a): > On Mon, Nov 8, 2010 at 09:05, Daniel Langr <daniel.langr at gmail.com > <mailto:daniel.langr at gmail.com>> wrote: > > is there any way to use 32-bit integers for indexing rows/columns > and 64-bit integers for indexing nonzeros at the same time in PETSc? > I have a matrix with 4,559,168,066 nonzeros but only 448,797 > rows/columns. For a general CSR scheme, the memory savings are > almost 25% when using 32-bit integers compared to 64-bit for > indexing columns, which is really a lot of memory. > > > Are you running in serial? As long as the local part of any matrix has > less than 2B entries (which would cost more than 24 GiB to store) and > the global problem has dimension less than 2B, you should be fine using > 32-bit indices. > > Jed
