<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">Adding a little, my opinion.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">If it is a large supercomputer, use whatever mpi they have. Sometimes these are tuned. Wien2k can use any of them, you just need to tweak the compilation libraries.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">If it is your cluster, I find the Intel mpi to be reliable and easy to use (and free).</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">If the supercomputer has many different, Intel mpi might be best as it is often cleaner when things crash (or at least was).</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 9, 2021 at 4:10 PM Peter Blaha <<a href="mailto:pblaha@theochem.tuwien.ac.at">pblaha@theochem.tuwien.ac.at</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">> after a year, I am returning to this thread, because I highly need <br>
> optimized wien2k, capable of treating very large systems.<br>
> <br>
> a) For parallel installation, is IntelMPI better than an OpenMPI built <br>
> with Intel ?<br>
<br>
The default parameters of wien2k work with intel-mpi, for open-mpi you <br>
need to adapt the mkl-blacks library. And openmpi should be properly <br>
installed.<br>
<br>
> b) Is ELPA needed for fast parallel Wien2K ? There is already MKL.<br>
One can use only Scalapack, which is in the mkl. However, the ELPA <br>
libraries are significantly faster. So I highly recommend them.<br>
> <br>
> c) Parallel FFTW3 is a must, right ?<br>
<br>
Yes.<br>
<br>
In any case, the mpi version needs the corresponding hardware with fast <br>
network (infiniband) or at least a good multicore cpu.<br><br></blockquote></div><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Professor Laurence Marks<br>Department of Materials Science and Engineering<br>Northwestern University<br><a href="http://www.numis.northwestern.edu/" target="_blank">www.numis.northwestern.edu</a><div>"Research is to see what everybody else has seen, and to think what nobody else has thought" Albert <span style="font-family:Arial,Helvetica,sans-serif;font-size:12.8px">Szent-</span><span style="font-family:Arial,Helvetica,sans-serif;font-size:small;color:rgb(34,34,34)">Györgyi</span></div></div></div></div>