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<p>Hi Dave,<br>
<br>
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?</p>
<pre class="moz-signature" cols="72">Thank you very much.
Yours sincerely,
================================================
TAY Wee-Beng (Zheng Weiming) 郑伟明
Personal research webpage: <a class="moz-txt-link-freetext" href="http://tayweebeng.wixsite.com/website">http://tayweebeng.wixsite.com/website</a>
Youtube research showcase: <a class="moz-txt-link-freetext" href="https://www.youtube.com/channel/UC72ZHtvQNMpNs2uRTSToiLA">https://www.youtube.com/channel/UC72ZHtvQNMpNs2uRTSToiLA</a>
linkedin: <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/tay-weebeng">www.linkedin.com/in/tay-weebeng</a>
================================================</pre>
<div class="moz-cite-prefix">On 27/3/2018 5:22 PM, Dave May wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJ98EDoqRHTsqDq6GW-gs5weRVtgqyuCuuF764xarMpighXCRA@mail.gmail.com">
<div dir="ltr"><br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 27 March 2018 at 10:16, TAY
wee-beng <span dir="ltr"><<a
href="mailto:zonexo@gmail.com" target="_blank"
moz-do-not-send="true">zonexo@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I have been compiling and building different version of my
CFD with the intel 2016, 2018 compilers, and also
different compiling options.<br>
<br>
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.<br>
<br>
However, I can't recall how it was compiled. I only know
that I used the intel 2016 compiler.<br>
<br>
So is there any way I can find out how the a.out was
compiled? Like what options were used?</blockquote>
<div><br>
</div>
<div>Since you posted to the list I presume "a.out" links
against petsc...</div>
<div>If so, run your code with </div>
<div> -log_view</div>
<div><br>
</div>
<div>Upon calling PetscFinalize(), you will get all the
options given to PETSc configure, plus the CFLAGS, link
lines, etc.</div>
<div><br>
</div>
</div>
</div>
</div>
</blockquote>
<br>
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