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<br><div><div>On Nov 3, 2008, at 12:24 PM, Lawrie Schonfelder wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <div><span class="593585018-03112008"><font face="Arial" color="#0000ff" size="2">I ...<span class="Apple-style-span" style="color: rgb(0, 0, 221); font-size: 12px; -webkit-text-stroke-width: -1; "> particular multiprocessor architectures...</span></font></span></div></blockquote><div><br></div><div>Given the ever growing pool of multi-core (and/or multithreaded) processors ... and the sheer physical difficultly of arbitrarily increasing clock speeds, I think the particular multiprocessor architectures to which this facility applies is virtually all interesting ones going forward (OK, PDA/handheld phones may well NOT go multi-core in a big way, as power is their biggest driver ... but is Fortran really focused on that sort of thing? Should it??).</div><div>..</div><blockquote type="cite"> <div><span class="593585018-03112008"><font face="Arial" color="#0000ff" size="2">I will accept a lack of detailed direct experience but I would be very surprised if co-arrays were anything but useless on an architecture that was a tree-structure of multi-level separate memory processors, such as I recall being constructed using transputer chips in the 1990s; useless as general purpose machines but for specific problems where the problem and the interconnection matched, the solution performance improvement was considerable</font></span></div></blockquote><div><br></div><div>As distasteful as the thought is, I suspect that such ensembles will be constructed of multi-core/multi-threaded elements, so one will eventually have to figure out how to program using both paradigms.</div><div><br></div><div>Fortran is primarily used for numerical computing where speed counts; so features necessary for performance should remain on the committee's radar...at least IMNSHO.</div><div><br></div></div><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: 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: 0; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Courier New"><span class="Apple-style-span" style="font-family: 'Courier New'; ">-- </span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Courier New"><span class="Apple-style-span" style="font-family: 'Courier New'; ">Keith H. 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