[petsc-users] Matrix stored on many machines, filled by one process

[Jed Brown]

On Thu, May 19, 2011 at 12:00, Bartłomiej W <bartlomiej.wach at yahoo.pl>wrote:

> This might be the problem, it occurs it is 32 bit, tried to compile with
> -m64 though  but got
>
> /usr/bin/ld: skipping incompatible
> .../petsc-3.1-p8/linux-gnu-c-debug/lib/libpetsc.a when searching for -lpetsc
>

You need to reconfigure PETSc using 64-bit compilers, then rebuild the
library.

For a diagonal matrix, you can call
MatSeqAIJSetPreallocation(Dinv,1,PETSC_NULL) immediately after
MatSetFromOptions() and it will use much less memory.
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