[petsc-users] Obtaining compiling and building information from a.out

[Matthew Knepley]

On Tue, Mar 27, 2018 at 10:17 PM, TAY wee-beng <zonexo at gmail.com> wrote:

> Hi Dave,
>
> I looked at the output using log_view and re-compile. However, although I
> use the same options "-xHost -g -O3 -openmp" (some filenames and dir names
> are now different but they are actually the same), I still get different
> results timing. I have attach both, fast and slow. So what else can I do to
> pinpoint the differences?
>
> The solver options must be different. In Fast, there is almost no time in
LUFactor, but in Slow its half the time.

   Matt

> Thank you very much.
>
> Yours sincerely,
>
> ================================================
> TAY Wee-Beng (Zheng Weiming) 郑伟明
> Personal research webpage: http://tayweebeng.wixsite.com/website
> Youtube research showcase: https://www.youtube.com/channel/UC72ZHtvQNMpNs2uRTSToiLA
> linkedin: www.linkedin.com/in/tay-weebeng
> ================================================
>
> On 27/3/2018 5:22 PM, Dave May wrote:
>
>
>
> On 27 March 2018 at 10:16, TAY wee-beng <zonexo at gmail.com> wrote:
>
>> Hi,
>>
>> I have been compiling and building different version of my CFD with the
>> intel 2016, 2018 compilers, and also different compiling options.
>>
>> I tested a version of my a.out and it is much faster than the other
>> a.out, using only 3 min instead of more than 10min to solve a certain case
>> using GAMG.
>>
>> However, I can't recall how it was compiled. I only know that I used the
>> intel 2016 compiler.
>>
>> So is there any way I can find out how the a.out was compiled? Like what
>> options were used?
>
>
> Since you posted to the list I presume "a.out" links against petsc...
> If so, run your code with
>   -log_view
>
> Upon calling PetscFinalize(), you will get all the options given to PETSc
> configure, plus the CFLAGS, link lines, etc.
>
>
>


-- 
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.caam.rice.edu/~mk51/>
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