From owner-sc22wg5@open-std.org Thu Jan 22 17:48:44 2009 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 8100ACA5FE6; Thu, 22 Jan 2009 17:48:44 +0100 (CET) X-Original-To: sc22wg5@open-std.org Delivered-To: sc22wg5@open-std.org Received: from mk-filter-3-a-1.mail.uk.tiscali.com (mk-filter-3-a-1.mail.uk.tiscali.com [212.74.100.54]) by www2.open-std.org (Postfix) with ESMTP id CEAA6CA3439 for ; Thu, 22 Jan 2009 17:48:43 +0100 (CET) X-Trace: 131524022/mk-filter-3.mail.uk.tiscali.com/B2C/$b2c-THROTTLED-DYNAMIC/b2c-CUSTOMER-DYNAMIC-IP/88.104.135.245/None/d.muxworthy@bcs.org.uk X-SBRS: None X-RemoteIP: 88.104.135.245 X-IP-MAIL-FROM: d.muxworthy@bcs.org.uk X-MUA: Apple Mail (2.753.1) X-IP-BHB: Once X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AisEAKYweElYaIf1/2dsb2JhbAABB8tPhXM X-IronPort-AV: E=Sophos;i="4.37,307,1231113600"; d="scan'208";a="131524022" Received: from 88-104-135-245.dynamic.dsl.as9105.com (HELO [192.168.1.3]) ([88.104.135.245]) by smtp.tiscali.co.uk with ESMTP; 22 Jan 2009 16:48:41 +0000 Mime-Version: 1.0 (Apple Message framework v753.1) References: <20090122161435.44EF3CA5FE6@www2.open-std.org> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <2AC3A215-E761-4379-9F44-C52C7F5833C8@bcs.org.uk> Content-Transfer-Encoding: 7bit From: David Muxworthy Subject: Fwd: BOUNCE sc22wg5@open-std.org: Non-member submission from [Jeff Squyres ] Date: Thu, 22 Jan 2009 16:49:56 +0000 To: sc22wg5@open-std.org X-Mailer: Apple Mail (2.753.1) Sender: owner-sc22wg5@open-std.org Precedence: bulk Return-Path: X-Original-To: sc22wg5@open-std.org Delivered-To: sc22wg5@open-std.org Received: from rtp-iport-1.cisco.com (rtp-iport-1.cisco.com [64.102.122.148]) by www2.open-std.org (Postfix) with ESMTP id 65AE4CA3439 for ; Thu, 22 Jan 2009 17:14:33 +0100 (CET) X-IronPort-AV: E=Sophos;i="4.37,307,1231113600"; d="scan'208";a="34581800" Received: from rtp-dkim-2.cisco.com ([64.102.121.159]) by rtp-iport-1.cisco.com with ESMTP; 22 Jan 2009 16:14:16 +0000 Received: from rtp-core-2.cisco.com (rtp-core-2.cisco.com [64.102.124.13]) by rtp-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id n0MGEHBU026228; Thu, 22 Jan 2009 11:14:17 -0500 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-2.cisco.com (8.13.8/8.13.8) with ESMTP id n0MGEGXl004933; Thu, 22 Jan 2009 16:14:16 GMT Received: from xfe-rtp-202.amer.cisco.com ([64.102.31.21]) by xbh- rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 22 Jan 2009 11:14:16 -0500 Received: from rtp-jsquyres-8711.cisco.com ([10.116.19.194]) by xfe- rtp-202.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 22 Jan 2009 11:14:15 -0500 Cc: fortran standards email list for J3 , WG5 , Van.Snyder@jpl.nasa.gov Message-Id: From: Jeff Squyres To: longb@cray.com, MPI-3 Fortran working group In-Reply-To: <49789AC3.4010203@cray.com> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v930.3) Subject: Re: [MPI3 Fortran] (j3.2006) (SC22WG5.3886) MPI non-blocking transfers Date: Thu, 22 Jan 2009 11:14:13 -0500 References: <49776DF7.1040900@cray.com> <20090121211748.130A5C178D9@www2.open- std.org> <20090121224014.6CB63C178D9@www2.open-std.org> <20090121234200.4F3BDCA3434@www2.open-std.org> <20090122000407.D5A8ECA3434@www2.open-std.org> <20090122100652.C31E9CA3434@www2.open-std.org> <49789AC3.4010203@cray.com> X-Mailer: Apple Mail (2.930.3) X-OriginalArrivalTime: 22 Jan 2009 16:14:16.0411 (UTC) FILETIME= [791072B0:01C97CAC] DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; l=1077; t=1232640857; x=1233504857; c=relaxed/simple; s=rtpdkim2001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=jsquyres@cisco.com; z=From:=20Jeff=20Squyres=20 |Subject:=20Re=3A=20[MPI3=20Fortran]=20(j3.2006)=20(SC22WG5 .3886)=20[ukfortran]=09[MPI3=09Fortran]=09MPI=09non-blocking =20transfers |Sender:=20 |To:=20longb@cray.com,=0A=20=20=20=20=20=20=20=20MPI-3=20Fo rtran=20working=20group=20; bh=aHxq9AQAHz285168IFvzeG7SYmhyz8h7WhdcreQGoVo=; b=o3xcmMMPK1r7ukEJeezA6oq9pcis29Tmamjx3B7s+svvVbBGjT0hmx22av AAhdoWe045SmLUiPJ6mcMTtWV0IjBPBtUNpWDlR3tl+u4diIKn50K8m+Gcuy dM94tBKNAp; Authentication-Results: rtp-dkim-2; header.From=jsquyres@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim2001 verified; ); On Jan 22, 2009, at 11:11 AM, Bill Long wrote: >>> One simple step toward solving the problem is to write an extra >>> interface layer that includes the argument, which then calls the >>> real >>> MPI wait routine, not passing that argument. Then declaring the >>> buffer >>> and the dummy argument of the wait routine interface layer to be >>> ASYNCHRONOUS ought to work, according to the rules we already have >>> in >>> place for Fortran asynchronous I/O. > > The basic problem with adding a buffer argument to a variant of the > MPI_wait routines is that the buffer variable may not be accessible > in the scoping unit of the call. This seems like a fatal flaw with > this approach. It's also a problem for the array variants of MPI_TEST and MPI_WAIT (that take variable-length arrays of requests). Also remember that MPI_TEST may or may not complete the request; just calling MPI_TEST (or any of its array variants) does not guarantee that the buffer is "owned" by the application again. -- Jeff Squyres Cisco Systems