<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Given how many implementations claimed MPI 3.0 support when their RMA implementations were garbage piles of incorrectness or pathetic performance, it borders on the absurd to think that logical rigor about feature support will stop anyone from claiming MPI 4.0 support.<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Jan 11, 2021, at 7:22 AM, Wesley Bland via mpi-forum <mpi-forum@lists.mpi-forum.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8">I agree with Jeff that this is a non-issue. Bill’s assertion that adding Fortran support for large count once you have C support has been true in MPICH development at least and no vender would drop anything just to put MPI 4.0 compatibility on a marketing slide. They’d just put it on the slide anyway. Every implementation out there has some sort of exception, intentional or otherwise, that makes them technically non-compliant. In the end, their users determine 1) whether they care enough to request the feature and 2) whether they care enough to switch to a competing library.<div class=""><br class=""></div><div class="">I think the best way forward is to do something like what had been proposed when the embiggening/pythonization started and separate bindings from specification and just say that an MPI implementation has MPI 4.0 C bindings and MPI 3.1 F08 bindings and MPI 5.0 Python bindings. That means each binding can be updated in whatever way makes sense for them. For 4.0, I don’t think this is an issue that needs to be resolved. Us telling the implementations what they have to do will have essentially no impact anyway.</div><div class=""><br class=""></div><div class=""><div class="">Thanks,</div><div class="">Wes</div><div><br class=""><blockquote type="cite" class=""><div class="">On Jan 11, 2021, at 6:26 AM, Rolf Rabenseifner via mpi-forum <<a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta charset="UTF-8" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Dear Jeff and all,</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">I think their users would be very unhappy.<br class=""></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Yes, users can be unhappy and compute centers may definitely recommend<span class="Apple-converted-space"> </span></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">an other MPI library - at least for any software development.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">I want to remember that MPI-3.1 requires for the mpi module:</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">"Provide explicit interfaces according to the Fortran routine interface specications.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">This module therefore guarantees compile-time argument checking and allows positional</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">and keyword-based argument lists. If an implementation is paired with a</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">compiler that either does not support TYPE(*), DIMENSION(..) from TS 29113, or</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">is otherwise unable to ignore the types of choice buffers, then the implementation must</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">provide explicit interfaces only for MPI routines with no choice buer arguments. See</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Section 17.1.6 for more details."</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Although there are no more such compilers that do not provide one of the two methods,</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">there are more than 5 years after MPI-3.1 still MPI libraries that do not</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">provide keyword-based argument lists with the mpi module.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">And those libraries provide such support for the mpi_f08 module.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">This means, they prove that they are not MPI-3.1 compliant :-)</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Sometimes implementors ignore the goals and the wording of the MPI standard.<span class="Apple-converted-space"> </span></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">And there is also no request that users want to have a less-quality</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">mpi module definition.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Best regards</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Rolf</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">----- Original Message -----</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">From: "Main MPI Forum mailing list" <<a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a>><br class="">To: "Main MPI Forum mailing list" <<a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a>><br class="">Cc: "Jeff Squyres" <<a href="mailto:jsquyres@cisco.com" class="">jsquyres@cisco.com</a>><br class="">Sent: Sunday, January 10, 2021 5:09:55 PM<br class="">Subject: Re: [Mpi-forum] Big Fortran hole in MPI-4.0 Embiggening<br class=""></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">I can't imagine a vendor would:<br class=""><br class="">- support mpi_f08<br class="">- then stop supporting mpi_f08 just so that they can get an "MPI-4.0" release<br class="">out<br class="">- then support mpi_f08 again<br class=""><br class="">I think their users would be very unhappy.<br class=""><br class=""><br class=""><br class=""><br class=""><br class="">On Jan 10, 2021, at 10:55 AM, William Gropp via mpi-forum < [<br class=""><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mailto:mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>] > wrote:<br class=""><br class="">I agree with Dan that this is a big change from the RCM. Further, the approach<br class="">in MPI has always been to encourage the users to make it clear to the vendors<br class="">what is acceptable in implementations, especially implementation schedules.<br class="">Nothing in the standard prohibits implementors from continuing to provide MPI<br class="">3.x implementations while they work to provide a full MPI 4.0 implementation.<br class="">The MPI forum has no enforcement power on the implementors, and I believe this<br class="">text is unnecessary and will not provide the guarantee that Rolf wants.<br class="">Further, frankly once the C embiggened interface is implemented, creating the<br class="">mpi_f08 version is relatively straightforward.<br class=""><br class="">Bill<br class=""><br class="">William Gropp<br class="">Director, NCSA<br class="">Thomas M. Siebel Chair in Computer Science<br class="">University of Illinois Urbana-Champaign<br class="">IEEE-CS President-Elect<br class=""><br class=""><br class=""><br class=""><br class=""><br class=""><br class="">On Jan 10, 2021, at 7:44 AM, HOLMES Daniel via mpi-forum < [<br class=""><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mailto:mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>] > wrote:<br class=""><br class="">Hi Rolf,<br class=""><br class="">This is a (somewhat contrived, arguably) reason for taking another tiny step<br class="">towards removing the “mpif.h” method of Fortran support and pushing users and<br class="">implementations towards preferring the Fortran 2008 interface, which is a<br class="">direction of travel that I fully support.<br class=""><br class="">I think this might be seen as quite a big change for implementers, especially if<br class="">it were to occur between the RCM and FRM.<br class=""><br class="">Cheers,<br class="">Dan.<br class="">—<br class="">Dr Daniel Holmes PhD<br class="">Architect (HPC Research)<br class="">[<span class="Apple-converted-space"> </span><a href="mailto:d.holmes@epcc.ed.ac.uk" class="">mailto:d.holmes@epcc.ed.ac.uk</a><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span><a href="mailto:d.holmes@epcc.ed.ac.uk" class="">d.holmes@epcc.ed.ac.uk</a><span class="Apple-converted-space"> </span>]<br class="">Phone: +44 (0) 131 651 3465<br class="">Mobile: +44 (0) 7940 524 088<br class="">Address: Room 2.09, Bayes Centre, 47 Potterrow, Central Area, Edinburgh, EH8 9BT<br class="">—<br class="">The University of Edinburgh is a charitable body, registered in Scotland, with<br class="">registration number SC005336.<br class="">—<br class=""><br class=""><br class=""><br class=""><br class="">On 10 Jan 2021, at 12:22, Rolf Rabenseifner via mpi-forum < [<br class=""><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mailto:mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>] > wrote:<br class=""><br class="">This email was sent to you by someone outside the University.<br class="">You should only click on links or attachments if you are certain that the email<br class="">is genuine and the content is safe.<br class=""><br class="">Dear MPI-Forum members,<br class=""><br class="">MPI-3.1 and MPI-4.0 includes the following rule on top of the 2nd page<br class="">of the Language Binding chapter:<br class=""><br class="">| MPI implementations providing a Fortran interface must provide<br class="">| one or both of the following:<br class="">| - The USE mpi_f08 Fortran support method.<br class="">| - The USE mpi and INCLUDE 'mpif.h' Fortran support methods.<br class=""><br class="">The embiggening was included only in the C and mpi_f08 bindings.<br class=""><br class="">Most implementors nowadays provide all three MPI Fortran support methods,<br class="">i.e., the mpi_f08 and the mpi module and mpif.h.<br class=""><br class="">For all MPI-3.1 libraries that provide all three MPI Fortran support methods,<br class="">the most easiest and fastest way to provide MPI-4.0 for C and Fortran is,<br class="">- to implement the embiggening for C,<br class="">- and to remove the mpi_f08 module,<br class="">- and maybe months or years later, to provide mpi_f08 again, now embiggened.<br class=""><br class="">This implementation path (by removing mpi_f08 from MPI-3.1 and to name<br class="">it MPI-4.0 without Fortran embiggening) was of course never intended,<br class="">when we decided to require the embiggened routines only for mpi_f08.<br class="">The goal was<br class="">- to not require additional work from the implementors for the old mpi module<br class="">- convince the users that it is a good idea to make a transition<br class="">to mpi_f08.<br class=""><br class="">The most simplest way to resolve this problem would be to require<br class="">mpi_f08 for MPI-4.0, i.e., to change the text to<br class=""><br class="">| MPI implementations providing a Fortran interface<br class="">| - must provide the USE mpi_f08 Fortran support method,<br class="">| - and additionally may provide both,<br class="">| the USE mpi and INCLUDE 'mpif.h' Fortran support methods.<br class=""><br class="">What is your opinion?<br class=""><br class="">I expect that we should discuss this next Wednesday at our MPI Forum telcon.<br class=""><br class="">Best regards<br class="">Rolf<br class=""><br class="">--<br class="">Dr. Rolf Rabenseifner . . . . . . . . . .. [<span class="Apple-converted-space"> </span><a href="mailto:rabenseifner@hlrs.de" class="">mailto:rabenseifner@hlrs.de</a><span class="Apple-converted-space"> </span>| email<br class=""><a href="mailto:rabenseifner@hlrs.de" class="">rabenseifner@hlrs.de</a><span class="Apple-converted-space"> </span>] .<br class="">High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 .<br class="">University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 .<br class="">Head of Dpmt Parallel Computing . . . [<br class=""><a href="https://urldefense.com/v3/__http://www.hlrs.de/people/rabenseifner__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimsJIa6Siw$" class="">https://urldefense.com/v3/__http://www.hlrs.de/people/rabenseifner__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimsJIa6Siw$</a><br class="">|<span class="Apple-converted-space"> </span><a href="http://www.hlrs.de/people/rabenseifner" class="">www.hlrs.de/people/rabenseifner</a><span class="Apple-converted-space"> </span>] .<br class="">Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307) .<br class="">_______________________________________________<br class="">mpi-forum mailing list<br class="">[<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mailto:mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>]<br class="">[<br class=""><a href="https://urldefense.com/v3/__https://lists.mpi-forum.org/mailman/listinfo/mpi-forum__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimt6yFS01Q$" class="">https://urldefense.com/v3/__https://lists.mpi-forum.org/mailman/listinfo/mpi-forum__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimt6yFS01Q$</a><br class="">|<span class="Apple-converted-space"> </span><a href="https://lists.mpi-forum.org/mailman/listinfo/mpi-forum" class="">https://lists.mpi-forum.org/mailman/listinfo/mpi-forum</a><span class="Apple-converted-space"> </span>]<br class=""><br class="">_______________________________________________<br class="">mpi-forum mailing list<br class="">[<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mailto:mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>]<br class="">[<br class=""><a href="https://urldefense.com/v3/__https://lists.mpi-forum.org/mailman/listinfo/mpi-forum__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimt6yFS01Q$" class="">https://urldefense.com/v3/__https://lists.mpi-forum.org/mailman/listinfo/mpi-forum__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimt6yFS01Q$</a><br class="">|<br class=""><a href="https://urldefense.com/v3/__https://lists.mpi-forum.org/mailman/listinfo/mpi-forum__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimt6yFS01Q$" class="">https://urldefense.com/v3/__https://lists.mpi-forum.org/mailman/listinfo/mpi-forum__;!!DZ3fjg!pq7EsFbFnneGZo_3EudtIahAxSmoQr0t9AbsAl3CqBoVuMfHl3ICDYnCimt6yFS01Q$</a><br class="">]<br class=""><br class="">_______________________________________________<br class="">mpi-forum mailing list<br class="">[<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mailto:mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a><span class="Apple-converted-space"> </span>]<br class=""><a href="https://lists.mpi-forum.org/mailman/listinfo/mpi-forum" class="">https://lists.mpi-forum.org/mailman/listinfo/mpi-forum</a><br class=""><br class=""><br class="">_______________________________________________<br class="">mpi-forum mailing list<br class=""><a href="mailto:mpi-forum@lists.mpi-forum.org" class="">mpi-forum@lists.mpi-forum.org</a><br class=""><a href="https://lists.mpi-forum.org/mailman/listinfo/mpi-forum" class="">https://lists.mpi-forum.org/mailman/listinfo/mpi-forum</a><br class=""></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">--<span class="Apple-converted-space"> </span></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Dr. Rolf Rabenseifner . . . . . . . . . .. email<span class="Apple-converted-space"> </span></span><a href="mailto:rabenseifner@hlrs.de" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">rabenseifner@hlrs.de</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span>.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 .</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 .</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Head of Dpmt Parallel Computing . . .<span class="Apple-converted-space"> </span></span><a href="http://www.hlrs.de/people/rabenseifner" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">www.hlrs.de/people/rabenseifner</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span>.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307) .</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">mpi-forum mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><a href="mailto:mpi-forum@lists.mpi-forum.org" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">mpi-forum@lists.mpi-forum.org</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><a href="https://lists.mpi-forum.org/mailman/listinfo/mpi-forum" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://lists.mpi-forum.org/mailman/listinfo/mpi-forum</a></div></blockquote></div><br class=""></div><span>_______________________________________________</span><br><span>mpi-forum mailing list</span><br><span>mpi-forum@lists.mpi-forum.org</span><br><span>https://lists.mpi-forum.org/mailman/listinfo/mpi-forum</span><br></div></blockquote></body></html>