From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: tuhs-bounces@minnie.tuhs.org X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.1 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id b3bc8998 for ; Tue, 19 Jun 2018 21:16:36 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 5E35AA17D6; Wed, 20 Jun 2018 07:16:35 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 472A5A17C1; Wed, 20 Jun 2018 07:16:08 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 40A45A17C1; Wed, 20 Jun 2018 07:16:05 +1000 (AEST) X-Greylist: delayed 1804 seconds by postgrey-1.35 at minnie.tuhs.org; Wed, 20 Jun 2018 07:16:04 AEST Received: from vtr.rulingia.com (vtr.rulingia.com [45.77.232.82]) by minnie.tuhs.org (Postfix) with ESMTPS id 82402A17C0 for ; Wed, 20 Jun 2018 07:16:04 +1000 (AEST) Received: from server.rulingia.com (ppp59-167-167-3.static.internode.on.net [59.167.167.3]) by vtr.rulingia.com (8.15.2/8.15.2) with ESMTPS id w5JKjgjC053503 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 20 Jun 2018 06:45:48 +1000 (AEST) (envelope-from peter@rulingia.com) X-Bogosity: Ham, spamicity=0.000000 Received: from server.rulingia.com (localhost.rulingia.com [127.0.0.1]) by server.rulingia.com (8.15.2/8.15.2) with ESMTPS id w5JKjans039172 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 20 Jun 2018 06:45:36 +1000 (AEST) (envelope-from peter@server.rulingia.com) Received: (from peter@localhost) by server.rulingia.com (8.15.2/8.15.2/Submit) id w5JKjaN1039171; Wed, 20 Jun 2018 06:45:36 +1000 (AEST) (envelope-from peter) Date: Wed, 20 Jun 2018 06:45:36 +1000 From: Peter Jeremy To: Tim Bradshaw Message-ID: <20180619204536.GA91748@server.rulingia.com> References: <20180615152542.E1EC918C08C@mercury.lcs.mit.edu> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="0OAP2g/MAC+5xKAE" Content-Disposition: inline In-Reply-To: X-PGP-Key: http://www.rulingia.com/keys/peter.pgp User-Agent: Mutt/1.10.0 (2018-05-17) Subject: Re: [TUHS] core X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: The Eunuchs Hysterical Society Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --0OAP2g/MAC+5xKAE Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2018-Jun-18 10:25:03 +0100, Tim Bradshaw wrote: >Apropos of the 'my iPhone has more power than our System-360/50, but it ha= s nowhere near the sheer I/O throughput of a mainframe' comment: there's ob= viously no doubt that devices like phones (and laptops, desktops &c) are I/= O-starved compared to serious machines, but comparing the performance of an= iPhone and a 360/50 seems to be a matter of choosing how fine the dust you= want the 360/50 to be ground into should be. > >The 360/50 could, I think, transfer 4 bytes every 2 microseconds to/from m= ain memory, which is 20Mb/s. I've just measured my iPhone (6): it can do a= bout 36Mb/s ... over WiFi, backed by a 4G cellular connection One way of looking at this actually backs up the claim: An iPhone has maybe 3 orders of magnitude more CPU power than a 360/50 but only a couple of times the I/O bandwidth. So it's actually got maybe 2 orders of magnitude less relative I/O throughput. --=20 Peter Jeremy --0OAP2g/MAC+5xKAE Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE7rKYbDBnHnTmXCJ+FqWXoOSiCzQFAlspa3BfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEVF QjI5ODZDMzA2NzFFNzRFNjVDMjI3RTE2QTU5N0EwRTRBMjBCMzQACgkQFqWXoOSi CzT95A/+I9RDn8EluLKRus4OSGcQgWn5cF5fEK0SGIKwGDD0juaTMqCRGTar475I 8N4haFcKuNofUhOCKAe8mUWb610WkvlDhKxpdSchtvEqZpXk+seGSisgXYfRgyrn 9SHSJjHR4OtwVps+edY5BmjLOsTKiGFt987xnXhOJjjlbkkweW8fO1ZkAWTjmvDg irGPASVIO8I/F72NyDXJJpo1PwNNq2Xv2Uy698p6JMphrNTWuQefE5Gq+wNoIcCw DgfvPZmytuOgUNsBkmB6TDmHBgLXY1zYNxz+kE4v/ehS33MoJkX8K0in+XdFwEbx UZT00TNlOmFNspEmGUHU3mvKfR8qr2pJC+ZnjmkKnaJ/e9Us8LVWb+L4ed66E7C+ Th/iXFMCY17YEd+Mjj23vMYj94Jjita1QcDcZb7CKY0FBIK6R0px9MXje+cgl0F3 PrBtzzd8/mqDbXeAd4Sj0n/Y/cVVgi1XPQiLgXTqVotXQdIBswkqB93t0DADotAo AhjwppyU3oWEr2HXk+OW+J3kyDYUkuYdWxgMC3ZHM1oJJIQYVqq9E5iTj+V4A61B IVSJCZCU9BG38sH4FdEHj3fIc3ztyq+Ch+Xm0h+ndDGXDtYFmSbDEOoBCiRRo6FS SEw8NYhbqUYvDNRvH+Se1GKjECnx4ws7VpQ3waGZG4Ew1Tyvrgs= =gGG0 -----END PGP SIGNATURE----- --0OAP2g/MAC+5xKAE--