[petsc-users] Error of MatMPIAIJSetPreallocation

[Matthew Knepley]

On Thu, Jan 14, 2021 at 4:38 PM Qin Lu <lu_qin_2000 at yahoo.com> wrote:

> Hi Matthew,
>
> Thanks for your response! Does CHKERRQ work for FORTRAN-90?
>

Yes, see the examples.


> I linked my program with debug version of Petsc lib and got more error
> messages as attached below. I only used 8 processes, but the message said a
> big number, as well as a huge memory size, which must be wrong since the
> problem size is not very big. Does this mean the non-zero sizes passed to
> the subroutine are not correct?
>

Yes, the sizes passed are too large.

  Thanks,

     Matt


> Thanks,
> Qin
>
> ==== error messages =====
>
> [2]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
>
> [2]PETSC ERROR: Out of memory. This could be due to allocating
>
> [2]PETSC ERROR: too large an object or bleeding by not properly
>
> [2]PETSC ERROR: destroying unneeded objects.
>
> [2]PETSC ERROR: Memory allocated 0 Memory used by process 2049617920
>
> [2]PETSC ERROR: Try running with -malloc_dump or -malloc_view for info.
>
> [2]PETSC ERROR: Memory requested 18446744073458206720
>
> [2]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html for
> trouble shooting.
>
> [2]PETSC ERROR: Petsc Release Version 3.12.5, Mar, 29, 2020
>
>
> Sent from Yahoo Mail for iPhone
> <https://overview.mail.yahoo.com/?.src=iOS>
>
> On Thursday, January 14, 2021, 2:30 PM, Matthew Knepley <knepley at gmail.com>
> wrote:
>
> On Thu, Jan 14, 2021 at 11:58 AM Qin Lu via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
>
> Hello,
>
> My program got error 55 from calling MatMPIAIJSetPreallocation with Petsc
> version 3.12.5, what does this error mean? Interestingly, the same program
> using an older version 3.4.2 works fine. I did make necessary interface
> change in my program when I upgraded to 3.12.5.
>
>
> 1) You should always call CHKERRQ(ierr) after a Petsc call. Then you will
> get the full error message and stack to send in.
>
> 2) Your error code is here:
>
>   https://gitlab.com/petsc/petsc/-/blob/v3.12.5/include/petscerror.h#L17
>
> 3) It is a memory error. You asked for more memory than your machine could
> allocate.
>
>   Thanks,
>
>      Matt
>
>
> Thanks in advance for your help.
>
> Regards,
> Qin
>
>
>
> --
> 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
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
>

-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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