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 30073543 for ; Mon, 18 Jun 2018 09:25:14 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 25A37A19D4; Mon, 18 Jun 2018 19:25:13 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 7F4A8A19D3; Mon, 18 Jun 2018 19:25:03 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id A7A06A19D3; Mon, 18 Jun 2018 19:25:01 +1000 (AEST) Received: from mail1.g22.pair.com (mail1.g22.pair.com [66.39.65.155]) by minnie.tuhs.org (Postfix) with ESMTPS id 59F089EC27 for ; Mon, 18 Jun 2018 19:25:01 +1000 (AEST) Received: from mail1.g22.pair.com (localhost [127.0.0.1]) by mail1.g22.pair.com (Postfix) with ESMTP id BDCE14841B5; Mon, 18 Jun 2018 05:25:00 -0400 (EDT) Received: from [192.168.1.175] (unknown [213.205.198.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail1.g22.pair.com (Postfix) with ESMTPSA id 3B125449849; Mon, 18 Jun 2018 05:25:00 -0400 (EDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) From: Tim Bradshaw In-Reply-To: Date: Mon, 18 Jun 2018 10:25:03 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: References: <20180615152542.E1EC918C08C@mercury.lcs.mit.edu> To: Clem Cole X-Mailer: Apple Mail (2.3273) 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" Apropos of the 'my iPhone has more power than our System-360/50, but it = has nowhere near the sheer I/O throughput of a mainframe' comment: = there's obviously 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 = main memory, which is 20Mb/s. I've just measured my iPhone (6): it can = do about 36Mb/s ... over WiFi, backed by a 4G cellular connection (this = is towards the phone, the other direction is much worse). Over WiFi = with something serious behind it it gets 70-80Mb/s in both directions. = I have no idea what the raw WiFi bandwidth limit is, still less what the = raw memory bandwidth is or its bandwidth to 'disk' (ie flash or whatever = the storage in the phone is), but the phone has much more bandwidth over = a partly wireless network to an endpoint tens or hundreds of miles away = than the 360/50 had to main memory.=