From owner-sc22wg5@open-std.org Thu Oct 22 07:16:12 2009 Return-Path: X-Original-To: sc22wg5-dom8 Delivered-To: sc22wg5-dom8@www2.open-std.org Received: by www2.open-std.org (Postfix, from userid 521) id D3941C76BB7; Thu, 22 Oct 2009 07:16:12 +0200 (CET DST) X-Original-To: sc22wg5@open-std.org Delivered-To: sc22wg5@open-std.org Received: from ns.nag-j.co.jp (218-42-159-107.cust.bit-drive.ne.jp [218.42.159.107]) by www2.open-std.org (Postfix) with ESMTP id 16F46C178E4 for ; Thu, 22 Oct 2009 07:16:10 +0200 (CET DST) Received: from 218-42-159-108.cust.bit-drive.ne.jp ([218.42.159.108] helo=Marucomputer) by ns.nag-j.co.jp with smtp (Exim 4.50) id 1N0q0Y-00034s-4r for sc22wg5@open-std.org; Thu, 22 Oct 2009 14:14:42 +0900 Message-ID: <76AB2275605D4CE480A84B0D39736B0A@Marucomputer> From: "Malcolm Cohen" To: "SC22WG5" References: <20091020111544.C0F5CC178E3@www2.open-std.org><20091020154252.946EAC178E3@www2.open-std.org><20091021161933.1B2FCC178E3@www2.open-std.org><20091021171501.21FA4C178E3@www2.open-std.org><20091021175702.E4D26C178E3@www2.open-std.org> <20091022043326.83DB9C178E4@www2.open-std.org> In-Reply-To: <20091022043326.83DB9C178E4@www2.open-std.org> Subject: Re: [ukfortran] (SC22WG5.4104) (j3.2006) Standard intrinsics and coarrays Date: Thu, 22 Oct 2009 14:16:31 +0900 Organization: ??NAG MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 Sender: owner-sc22wg5@open-std.org Precedence: bulk Aleksandar Donev wrote: > In the case of a "shared" generator, I am not sure I understand exactly what > is meant, guaranteed, or processor dependent. Is it obvious to others and I am > just being dense? Yes it is obvious. In a "shared" generator there is a single seed and a single sequence. Images take values from that single sequence. In a "separate" generator, each image has a seed and a sequence. Each image takes values from its own sequence. It is trivial to discover this by careful syncing between two images and a sequence of random_seed and random_number calls. > It is processor dependent whether all images use a common > generator or whether each image uses a separate one. Perhaps we should require that it should be one or the other. Cheers, -- ................................Malcolm Cohen, Nihon NAG, Tokyo.