<div dir="ltr"><div dir="ltr">On Mon, Aug 16, 2021 at 3:04 PM Sebastian Hütter <<a href="mailto:sebastian.huetter@ovgu.de">sebastian.huetter@ovgu.de</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
>From the source code, I think "-ntg" now requires switching from slab to pencil decomposition using the <br>
undocumented switch "-pd"?<br></blockquote><div><br></div><div>exactly so <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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What are the implications of this method selection? Is one "better" or "worse" than the other, whatever that might mean?<br></blockquote><div><br></div><div>-pd true -ntg N is the same as -ntg N in previous versions. It is convenient only when you parallelize FFTs over a large number of MPI processes. Otherwise, FFTs with -pd true ("pencil decomposition") are typically slower than the default ("slab decomposition"). The choice will be made automatic sooner or later.</div><div><br></div><div>Paolo<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Thanks for any help,<br>
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Sebastian<br>
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-- <br>
M.Sc. Sebastian Hütter<br>
Otto-von-Guericke University Magdeburg<br>
Institute of Materials and Joining Technology<br>
Universitätsplatz 2<br>
D-39106 Magdeburg<br>
Tel.: +49 (0)391-67-54566<br>
Fax: +49 (0)391-67-44569<br>
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