[petsc-users] Problem with large grid size

[Fazlul Huq]

Thanks.

I have configured with 64-bit and then when I run, I got the following
error message:
***********************************************************************************************************************
[0]PETSC ERROR: --------------------- Error Message
--------------------------------------------------------------
[0]PETSC ERROR: Out of memory. This could be due to allocating
[0]PETSC ERROR: too large an object or bleeding by not properly
[0]PETSC ERROR: destroying unneeded objects.
[0]PETSC ERROR: Memory allocated 41632 Memory used by process 13361152
[0]PETSC ERROR: Try running with -malloc_dump or -malloc_log for info.
[0]PETSC ERROR: Memory requested 1614907707076
[0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
trouble shooting.
[0]PETSC ERROR: Petsc Release Version 3.10.2, Oct, 09, 2018
[0]PETSC ERROR: ./poisson_m on a arch-linux2-c-debug named
huq2090-XPS-15-9570 by huq2090 Thu Nov 29 20:24:13 2018
[0]PETSC ERROR: Configure options --download-hypre --download-mpich
--with-64-bit-indices
[0]PETSC ERROR: #1 VecCreate_Seq() line 35 in
/home/huq2090/petsc-3.10.2/src/vec/vec/impls/seq/bvec3.c
[0]PETSC ERROR: #2 PetscTrMallocDefault() line 183 in
/home/huq2090/petsc-3.10.2/src/sys/memory/mtr.c
[0]PETSC ERROR: #3 PetscMallocA() line 397 in
/home/huq2090/petsc-3.10.2/src/sys/memory/mal.c
[0]PETSC ERROR: #4 VecCreate_Seq() line 35 in
/home/huq2090/petsc-3.10.2/src/vec/vec/impls/seq/bvec3.c
[0]PETSC ERROR: #5 VecSetType() line 51 in
/home/huq2090/petsc-3.10.2/src/vec/vec/interface/vecreg.c
[0]PETSC ERROR: #6 VecSetTypeFromOptions_Private() line 1250 in
/home/huq2090/petsc-3.10.2/src/vec/vec/interface/vector.c
[0]PETSC ERROR: #7 VecSetFromOptions() line 1284 in
/home/huq2090/petsc-3.10.2/src/vec/vec/interface/vector.c
[0]PETSC ERROR: #8 main() line 57 in
/home/huq2090/petsc-3.10.2/problems/ksp/poisson_m.c
[0]PETSC ERROR: No PETSc Option Table entries
[0]PETSC ERROR: ----------------End of Error Message -------send entire
error message to petsc-maint at mcs.anl.gov----------
application called MPI_Abort(MPI_COMM_WORLD, 55) - process 0
[unset]: write_line error; fd=-1 buf=:cmd=abort exitcode=55
:
system msg for write_line failure : Bad file descriptor
************************************************************************************************************************************

Thanks.
Sincerely,
Huq

On Thu, Nov 29, 2018 at 1:51 PM Smith, Barry F. <bsmith at mcs.anl.gov> wrote:

>
>
> > On Nov 29, 2018, at 1:46 PM, Fazlul Huq via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
> >
> > Hello PETSc Developers,
> >
> > I am trying to run the code (attached herewith) with the following
> command and it works until the size of the matrix is 99999X99999. But when
> I try to run with 999999X999999 then I got weird result.
>
>    What is that "weird result"?
>
>    My guess is for problems that large you need to ./configure PETSc with
> the additional option --with-64-bit-indices since for such large problems
> 32 bit integers are not large enough to contain values needed for storing
> and accessing the sparse matrix.
>
>    Barry
>
> >
> > The command is:
> > ./poisson_m -n 999999 -pc_type hypre -pc_hypre_type boomeramg
> -ksp_view_solution
> > Any suggestions is appreciated.
> >
> > Thanks.
> > Sincerely,
> > Huq
> >
> >
> > --
> >
> > Fazlul Huq
> > Graduate Research Assistant
> > Department of Nuclear, Plasma & Radiological Engineering (NPRE)
> > University of Illinois at Urbana-Champaign (UIUC)
> > E-mail: huq2090 at gmail.com
> > <poisson_m.c>
>
>

-- 

Fazlul Huq
Graduate Research Assistant
Department of Nuclear, Plasma & Radiological Engineering (NPRE)
University of Illinois at Urbana-Champaign (UIUC)
E-mail: huq2090 at gmail.com
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