<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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></body></html>