<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Relevant to this is that enhancing generalized requests also came up. Part of the discussion is this: would an enhancement to generalized requests, which would have broader benefit, be a more general solution?<div><br></div><div>Background: The Forum is increasingly concerned about the creation of routines to solve specific problems rather than stepping back and trying to find a more general and powerful solution. </div><div><div><br></div><div>Bill</div><div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="font-size: 12px; ">William Gropp</div><div style="font-size: 12px; ">Director, Parallel Computing Institute</div><div style="font-size: 12px; ">Deputy Director for Research</div><div style="font-size: 12px; ">Institute for Advanced Computing Applications and Technologies</div></div></div></span><span class="Apple-style-span" style="font-size: 12px; ">Thomas M. Siebel Chair in Computer Science</span><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="font-size: 12px; ">University of Illinois Urbana-Champaign</div></div><div><br></div></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline">
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<br><div><div>On Mar 13, 2013, at 2:56 PM, Rob Latham wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>On Wed, Mar 13, 2013 at 02:46:34PM -0500, Quincey Koziol wrote:<br><blockquote type="cite"><blockquote type="cite">Can something be done with generalized request?<br></blockquote></blockquote><blockquote type="cite"><span class="Apple-tab-span" style="white-space:pre"> </span>Someone always brings this up. :-) We should get up to speed on the GRQ routines and know what they can do...<br></blockquote><br>They cannot do much. I am, reluctantly, the worlds expert on<br>generalized requests, having written a paper about it 5(!!!) years<br>ago.<br><br><a href="http://dx.doi.org/10.1007/978-3-540-75416-9_33">http://dx.doi.org/10.1007/978-3-540-75416-9_33</a><br><br>pdf: http://www.mcs.anl.gov/~robl/papers/latham_grequest-enhance.pdf<br><br>Standard Generalized requests have a "all progress must happen outside<br>of MPI" progress model. Perhaps in this modern surfeit of cores era,<br>it is no longer a big deal to spawn a thread ?<br><br>The paper I linked proposes generalized request extensions designed to<br>play better with posix, pvfs, and NTFS async i/o routines. These<br>routines can make progress in the background, but do need someone to<br>call a completion function (aio_suspend, PVFS_sys_wait, or<br>WaitForMultipleObjectEx).<br><br>==rob<br><br>-- <br>Rob Latham<br>Mathematics and Computer Science Division<br>Argonne National Lab, IL USA<br>_______________________________________________<br>MPI3-IO mailing list<br>MPI3-IO@lists.mpi-forum.org<br>http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-io<br></div></blockquote></div><br></div></div></body></html>