[petsc-users] PETSC using 32-bit integers

[José Lorenzo]

Matthew,

thank you for your useful advice. By running the code with -log_view I have
found the following message which might be related to my performance
troubles and that only appears when using PETSC with 32 bit integers:

      ##########################################################
      #                                                        #
      #                       WARNING!!!                       #
      #                                                        #
      #   This code was compiled with a debugging option.      #
      #   To get timing results run ./configure                #
      #   using --with-debugging=no, the performance will      #
      #   be generally two or three times faster.              #
      #                                                        #
      ##########################################################



El mar., 25 jun. 2019 a las 12:32, Matthew Knepley (<knepley at gmail.com>)
escribió:

> For any performance question, we need to see the output of -log_view for
> each case compared.
>
>   Thanks,
>
>     Matt
>
> On Tue, Jun 25, 2019 at 5:55 AM José Lorenzo via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
>
>> I have access to two PETSC installations: one using 64-bit integers and
>> another one with 32-bit integers. For some reason, when I run the exactly
>> same FORTRAN code (except for the size of integer type) using both
>> installations, the 32-bit one exhibits much lower performance in terms of
>> computation time. This is a problem because I need the 32-bit version in
>> order to be able to use the LU factorization provided in MUMPS.
>>
>> I would appreciate any hint helping me understand why this may happen.
>>
>
>
> --
> 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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