<br><br><div class="gmail_quote">On Wed, Sep 1, 2010 at 9:34 PM, Mark Abraham <span dir="ltr"><<a href="mailto:mark.abraham@anu.edu.au">mark.abraham@anu.edu.au</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 note the new pencil decomposition for PME with interest. Presumably that's only for the 3DFFT part? </blockquote><div>yes pencil decomposition refers to the 2D decomposition for the FFT.</div><div><br></div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Under what circumstances does it get used? Under what circumstances does the old decomposition get used? </blockquote>
<div>it is always used if the number of pme nodes (all nodes if no separate pme nodes) is larger than the nodes in the X direction of the PP decomposition.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Does the user need to know anything to use it effectively on different hardware? (e.g. BlueGene vs Intel+Infiniband)<br></blockquote><div>We didn't notice any difference in optimal settings between Cray and Infiniband. We haven't tested BlueGene. Feedback is welcome.</div>
<div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Should any of this get a mention in the manual?</blockquote><div>Not sure what would be helpful.</div>
<div>
<br></div><div>Roland</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">--<br>
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