From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 14281 invoked from network); 9 Apr 2022 13:17:03 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 9 Apr 2022 13:17:03 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id B8CBD9D710; Sat, 9 Apr 2022 23:16:56 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 13D479D680; Sat, 9 Apr 2022 23:16:36 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=serissa.com header.i=@serissa.com header.b="M7w/cRP4"; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.b="eBQdziLT"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id C217A9D680; Sat, 9 Apr 2022 23:15:46 +1000 (AEST) X-Greylist: delayed 361 seconds by postgrey-1.36 at minnie.tuhs.org; Sat, 09 Apr 2022 23:15:45 AEST Received: from out5-smtp.messagingengine.com (out5-smtp.messagingengine.com [66.111.4.29]) by minnie.tuhs.org (Postfix) with ESMTPS id E3D859D665 for ; Sat, 9 Apr 2022 23:15:45 +1000 (AEST) Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.nyi.internal (Postfix) with ESMTP id F32DD5C0127; Sat, 9 Apr 2022 09:09:43 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute4.internal (MEProxy); Sat, 09 Apr 2022 09:09:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=serissa.com; h= cc:cc:content-transfer-encoding:content-type:date:date:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:sender:subject:subject:to:to; s=fm3; bh=jddU1cFVlernPT wyXkiOg8VMi4l1B7K9BJPFDozzOcs=; b=M7w/cRP4cVuNOR5TyAwHdu/0ZrY1nK XYY3rl4wKdR8TfUSekq8e1ZCafQ0tUFCKGKNksXQP/YUpGak2L0tF+Ihwohr8YsH OMiT5adqDMr/OgqbnLj5eaCFfWLwAvAsHyVu/eBBf3TrsyO9DW0n9pUxoZMe1xSs EliL2ORHJU+xrmPLQKEHcWAp/0u6M0W53GuWeo0r4GeYNPKcXxSUnk3gRV9LGaNa xahUSDhk+SUXwDG7T4o99tVccUwqZ0a7oZCgiT1VoFc17iRO/XUKGOOkYryR7fi6 xTNzPMOE0C5wMACG/StPITenJI6AXRZnMAesaUN2anm69Tx4sXR6bcnA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:date:date:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:sender:subject :subject:to:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm3; bh=jddU1cFVlernPTwyXkiOg8VMi4l1B7K9BJPFDozzO cs=; b=eBQdziLTGPvadohr550BN2oVk6uJ/E74Wl0TJcotxnGT2S7gTl+JUOZdA T4MmXg6jvIksSjdr6AWr9+TCbHm08op9+eHVlrfou0sRYoOZHFiyqJ9bQ5wpvLnc q9PvDm8Uwbe+1vy9WT5NBx4NYRTK/yd8DBa2e6r4OuE4BqB8IOEsPf8nOsY6zgqk CjtAKZwulmuGrwKcSklGynn25oY7dtwQIuG7ck2pJsM9NFq7i59ms7p+FzaBnXM0 tW7UUmNSgMU5NHrVzhEfhno3+RXeFvrHuxevzCOQIYcEIqu3veU4hq4d+4sUC6I0 RKs6YJ+C0cGG76tKypzu2wl8ViBIg== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvvddrudekvddgfeeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurheptgfghfggufffkfhfjgfvofesthhqmhdthhdtjeenucfhrhhomhepnfgrrhhr hicuufhtvgifrghrthcuoehsthgvfigrrhhtsehsvghrihhsshgrrdgtohhmqeenucggtf frrghtthgvrhhnpefggeelgeeuleeihfekfffhgeejhefghfehtdfffeegudfhtdfhueel feeuffeutdenucffohhmrghinheptghorhgvfigrrhhsrdhorhhgnecuvehluhhsthgvrh fuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepshhtvgifrghrthesshgvrhhi shhsrgdrtghomh X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Sat, 9 Apr 2022 09:09:43 -0400 (EDT) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Larry Stewart Mime-Version: 1.0 (1.0) Date: Sat, 9 Apr 2022 09:09:39 -0400 Message-Id: <8421E032-BD2B-4512-833F-833382FDE559@serissa.com> References: In-Reply-To: To: Douglas McIlroy X-Mailer: iPad Mail (19E241) Subject: Re: [TUHS] {TUHS] Interesting Commentary on Unix from Multicians X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: TUHS main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" I worked for Vic at the Digital Cambridge Research Lab. Entirely awesome. A= nother Vic story is how he got sent to visit the Pave Paws radar on Cape Cod= because the locals were worried that software errors in the phased array co= ntrols could zap the populace. Vic talked to the radar people and found out that there was a hardware stop t= hat prevented beam angles below 3 degrees, so there was no need to worry abo= ut bugs. Vic would always remember what the original problem was, rather than get los= t in irrelevant details. -L > On Apr 9, 2022, at 7:48 AM, Douglas McIlroy wrote: >=20 > =EF=BB=BF >>=20 >> Single Level Storage is an awesome concept and removes so many ugly >> hacks from algorithms that otherwise have to process data in files. >=20 > This was Vic Vyssotsky's signature contribution to Multics, though in typi= cal > Vyssotsky fashion he never sought personal credit for it. Other awesome > Vyssotsky inventions: >=20 > BLODI (block diagram), the first data-flow language, for sample-data syste= ms. >=20 > Parallel flow analysis (later reinvented and published by John Cocke). Vi= c > installed this in Fortran to produce diagnostics such as, "If the > third branch of IF > statement 15 is ever taken, then variable E will be used before being set"= . >=20 > Darwin, the original game of predation and self-reproduction among program= s. > Corewars.org keeps a descendant version going 60 years later. >=20 > A minimum-spanning-tree algorithm quite different from the well-known meth= ods > due to his colleagues Bob Prim and Joe Kruskal, again unpublished. >=20 > Not long ago on TUHS, Andrew Hume told how Vic found the same isolated bug= in > dc by mathematically generating hard cases that Andrew stumbled on by acci= dent, >=20 > As you may infer, Vic is one of my personal computing heroes. >=20 > Doug