On Mon, Aug 13, 2012 at 12:07 PM, Barry Smith <span dir="ltr"><<a href="mailto:bsmith@mcs.anl.gov" target="_blank">bsmith@mcs.anl.gov</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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On Aug 13, 2012, at 12:05 PM, Hong Zhang <<a href="mailto:hzhang@mcs.anl.gov">hzhang@mcs.anl.gov</a>> wrote:<br>
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> Barry,<br>
> Elemental interface is not well tested yet.<br>
> I would wait for few months to remove PLAPACK stuff.<br>
<br>
</div> PLAPACK stuff is (and never was) well tested. Does anyone rely on it? I hope not. And I hate to have someone new come along and rely on it.</blockquote><div><br></div><div>I am for removing it. I wrote it, and so I can guarantee that it is not maintained. We should</div>
<div>just fix anything that comes up rather than fooling ourselves that this current stuff works.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span class="HOEnZb"><font color="#888888"><br>
Barry<br>
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><br>
> Hong<br>
><br>
> On Mon, Aug 13, 2012 at 11:50 AM, Jed Brown <<a href="mailto:jedbrown@mcs.anl.gov">jedbrown@mcs.anl.gov</a>> wrote:<br>
> On Mon, Aug 13, 2012 at 10:40 AM, Barry Smith <<a href="mailto:bsmith@mcs.anl.gov">bsmith@mcs.anl.gov</a>> wrote:<br>
> Should I remove all the MPIDense stuff from PETSc now? It is uses PLAPACK which is buggy and unsupported.<br>
><br>
> That is still a good distribution for MxN matrices with M>>N. We can do them with Elemental, but that would use a different distribution so it will be more complicated to interact with. (The current Elemental interface uses a squarish distribution, but we can tell Elemental to use the [VC,*] distribution (for which fewer operations are supported).<br>
><br>
> The main thing I care about for that distribution is QR. The best format is dense and row-aligned. I don't care whether it uses MPIDense or a new "multi-vector" thing, but that concept should be somewhere.<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener<br>