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<p>Thank you very much. Using .re2 instead of .rea brought down<br>
the time from 27 sec to 0.8 sec.<br>
</p>
<br>
<div class="moz-cite-prefix">On Tuesday 16 May 2017 12:56 PM,
<a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> wrote:<br>
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<div>For performance use .re2 and the latest master available on
GitHub.</div>
<div><br>
On 16 May 2017, at 11:57, "<a moz-do-not-send="true"
href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>"
<<a moz-do-not-send="true"
href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>>
wrote:<br>
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<p><font style="font-family: courier" size="2">
Hi Neks,<br>
<br>
We are carrying out an optimization study on IBM Blue
Gene/Q server<br>
of IDRIS using direct-adjoint method. The direct and
adjoint equations<br>
are solved using Nek5000. We have observed that for
moderate to large <br>
number of<br>
processors Nek5000 spends considerable time in reading
the .rea file.<br>
When we reduce the number of processors, the .rea file is
read in lesser <br>
time but<br>
the time taken for solver increases. To give an idea, a 3D
case for <br>
incompressible flow<br>
with 12000 elements spends 22.132 seconds in reading .rea
file if we use<br>
400 processors. If we increase the number of processors to
1000, it <br>
takes more than<br>
90 seconds to read the same .rea file. Can someone provide
us a solution on<br>
how to make Nek read the rea file quickly? Would using
.re2 file instead <br>
of .rea increase<br>
the performance considering the number of elements is not
very large.?<br>
I would like to mention that we are using PPLIST="MPIIO"
in the makenek <br>
file.<br>
<br>
Many thanks.<br>
<br>
<br>
<br>
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