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identity=mailfrom; envelope-from="khm@sciops.net"; helo=wopr.sciops.net; client-ip=216.126.196.60 Received: from wopr.sciops.net (wopr.sciops.net [216.126.196.60]) by tb-mx0.topicbox.com (Postfix) with ESMTP for <9fans@9fans.net>; Mon, 28 Aug 2023 14:21:22 -0400 (EDT) (envelope-from khm@sciops.net) Received: from localhost (wopr.sciops.net [local]) by wopr.sciops.net (OpenSMTPD) with ESMTPA id 263b94e4 for <9fans@9fans.net>; Mon, 28 Aug 2023 11:20:38 -0700 (PDT) Date: Mon, 28 Aug 2023 11:20:38 -0700 To: 9fans <9fans@9fans.net> Subject: Re: [9fans] Plan9 multi-core support Message-ID: Mail-Followup-To: 9fans <9fans@9fans.net> References: <16931297570.6681ce.192426@composer.9fans.topicbox.com> <97EEEC9FA2BC0033BD8DF60DF73416D3@eigenstate.org> <1790306295.1334479.1693225975991@mail.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <1790306295.1334479.1693225975991@mail.yahoo.com> Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: b3eac956-45cf-11ee-9c18-c587fb8b7b06 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UOTEyZTQ4MzhjYjFhMzcxZi1NNzgyZmQzZjZiODdhNmYzNjYxMmM3?= =?UTF-8?B?Y2ZkPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> From: "Kurt H Maier via 9fans" <9fans@9fans.net> List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M782fd3f6b87a6f36612c7cfd:1:F_RgtNshweGmYOFIWtuk5a7dYRbTkJI3tFGYjsMakMw On Mon, Aug 28, 2023 at 12:32:55PM +0000, G B via 9fans wrote: > Windows and Linux began on single-core single processor machines. Multip= rocessor had been around for some time--IBM's System 360 began using multi-= processors in 1968--but not for x86. Plan 9 first edition came out in 1992,= at a time when multicore didn't exist, and multicore was released with IBM= 's Power 4 in 2001.=C2=A0 > I can see why someone would ask if Plan 9 supports multicore. Plan 9 3rd = edition was released in 2000 and 4th edition was released in 2002. In each = case, going from single core-single processor to multiprocessor and then fr= om multiprocessor to multicore would require changes in the operating syste= m to recognize the extra processors and then the cores. Symmetric multiprocessing was available in 1992, even on x86 machines. Multics, tops-10, and various unixes all supported it by then. Once you have shared-memory SMP there's little difference between multiprocessor and multicore. Plan 9's implementation is imo cleaner than most of what came before, but by 1992 there was a lot of multiprocessing going on in the world. khm ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T912e4838cb1a371f-M782fd= 3f6b87a6f36612c7cfd Delivery options: https://9fans.topicbox.com/groups/9fans/subscription