<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr">Oh, I see. Thank you!<br><br><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 9, 2016 at 12:27 PM, Thakur, Rajeev <span dir="ltr"><<a href="mailto:thakur@mcs.anl.gov" target="_blank">thakur@mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Read it this way with the parenthesis:<br>
<br>
For long messages or (medium-size messages and non-power-of-two no. of processes)<br>
<div><div class="h5"><br>
<br>
> On May 9, 2016, at 12:21 PM, Jen B <<a href="mailto:jenbna@gmail.com">jenbna@gmail.com</a>> wrote:<br>
><br>
> Hello,<br>
><br>
> I am looking at allgatherv.c from:<br>
><br>
> <a href="http://git.mpich.org/mpich.git/tree/HEAD:/src/mpi/coll" rel="noreferrer" target="_blank">git.mpich.org/mpich.git/tree/HEAD:/src/mpi/coll</a><br>
><br>
> It says the following:<br>
><br>
> "For short or medium-size messages and power-of-two no. of processes,<br>
> we use the recursive doubling algorithm.<br>
> ...<br>
> For long messages or medium-size messages and non-power-of-two<br>
> no. of processes, we use a ring algorithm.<br>
> ..."<br>
><br>
> Could someone please tell me what algorithm is used when we have "long messages and power-of-two no. of processes"? Thanks a lot!<br>
><br>
> Best,<br>
> Jen<br>
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</blockquote></div><br></div></div></div>