From owner-sc22wg5@open-std.org Mon Dec 8 20:03:53 2008 Return-Path: X-Original-To: sc22wg5-dom7 Delivered-To: sc22wg5-dom7@www2.open-std.org Received: by www2.open-std.org (Postfix, from userid 521) id 9FD3DC178E0; Mon, 8 Dec 2008 20:03:53 +0100 (CET) X-Original-To: sc22wg5@open-std.org Delivered-To: sc22wg5@open-std.org Received: from proofpoint3.lanl.gov (proofpoint3.lanl.gov [204.121.3.28]) by www2.open-std.org (Postfix) with ESMTP id 90132C178DC for ; Mon, 8 Dec 2008 20:03:52 +0100 (CET) Received: from mailrelay1.lanl.gov (mailrelay1.lanl.gov [128.165.4.101]) by proofpoint3.lanl.gov (8.13.8/8.13.8) with ESMTP id mB8J3jKI017328; Mon, 8 Dec 2008 12:03:45 -0700 Received: from localhost (localhost.localdomain [127.0.0.1]) by mailrelay1.lanl.gov (Postfix) with ESMTP id 53E40343480; Mon, 8 Dec 2008 12:03:45 -0700 (MST) X-NIE-2-Virus-Scanner: amavisd-new at mailrelay1.lanl.gov Received: from cic-mail.lanl.gov (cic-mail.lanl.gov [128.165.4.115]) by mailrelay1.lanl.gov (Postfix) with ESMTP id 3D506343474; Mon, 8 Dec 2008 12:03:45 -0700 (MST) Received: from soren.lanl.gov (soren.lanl.gov [128.165.148.20]) by cic-mail.lanl.gov (Postfix) with ESMTP id 5927C208005; Mon, 8 Dec 2008 12:03:42 -0700 (MST) Cc: longb@cray.com, sc22wg5@open-std.org Message-Id: From: Craig Rasmussen To: fortran standards email list for J3 In-Reply-To: <20081208184041.89C0DC178E4@www2.open-std.org> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v929.2) Subject: Re: (j3.2006) (SC22WG5.3764) Response on the TR29113 draft N1761 Date: Mon, 8 Dec 2008 12:03:38 -0700 References: <20081207203535.92039C178D6@www2.open-std.org> <20081208171349.2CAD1C178E4@www2.open-std.org> <20081208184041.89C0DC178E4@www2.open-std.org> X-Mailer: Apple Mail (2.929.2) X-NIE-2-MailScanner-Information: Please see http://network.lanl.gov/email/virus-scan.php X-NIE-2-MailScanner: Found to be clean X-NIE-2-MailScanner-From: crasmussen@lanl.gov X-Spam-Status: No X-Proofpoint-Virus-Version: vendor=fsecure engine=4.65.7400:2.4.4,1.2.40,4.0.164 definitions=2008-12-08_12:2008-12-05,2008-12-08,2008-12-08 signatures=0 Sender: owner-sc22wg5@open-std.org Precedence: bulk On Dec 8, 2008, at 11:40 AM, Reinhold Bader wrote: > > > Bill Long schrieb: >> >> Reinhold Bader wrote: >> > Note that the >> main purpose of adding this feature was for MPI-like interfaces, >> where >> the only objective was to pass the object to a C function and give >> the >> function tools to correctly interpret the object. > > Yes. Note that I'm not yet sure the MPI Forum is going to swallow > this since > the MPI vendors apparently don't want to rewrite their whole > infrastructure to use > descriptors ... even though it provides the technically better > solution. Since the MPI vendors will have to write wrappers for the MPI functions, there is no real technical problem for them and I don't think they will complain too loudly (I will ask at the MPI Forum next week). The main requirement is that existing _users code_ won't need to change. The way the TR is currently written, I think the MPI 3.0 Fortran interfaces won't use assumed shape dummy variables and so vendors won't need to access descriptors. Regards, Craig