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Received: from cpe-70-94-128-193.satx.res.rr.com ([70.94.128.193]:51933 helo=smtpclient.apple) by mi3-ss4.a2hosting.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nYpiJ-0000PV-Ac for zsh-users@zsh.org; Mon, 28 Mar 2022 09:47:19 -0400 From: Perry Smith Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.80.82.1.1\)) Subject: Re: Parallel processing Date: Mon, 28 Mar 2022 08:47:18 -0500 References: <20220327113705.1799@sachi> To: zsh-users@zsh.org In-Reply-To: <20220327113705.1799@sachi> Message-Id: <1193520F-22B1-4786-AA20-E9B0FE9D1596@easesoftware.com> X-Mailer: Apple Mail (2.3696.80.82.1.1) X-AuthUser: pedz+easesoftware.com@mi3-ss4.a2hosting.com X-Seq: 27637 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: > On Mar 27, 2022, at 13:37, jdh wrote: >=20 > Re: the phrase "parallel processing": >=20 > So that beginners do not get the wrong idea I wish to make clear that = Unix based systems are not designed to, and can not do parallel = processing. Strictly speaking it is also not designed to do real time = processing. Unix/Linux does do multitasking by using task switching. = Unix based systems does allow users with the proper priviledge to set = task priority, which helps in deciding which task gets more run time. Well=E2=80=A6 drifting off the original topic: parallel processing, real = time processing, and SMP are all somewhat orthogonal concepts from each = other. The original "parallel processing" systems ran a version of AT&T unix = (e.g. Sequent). It predated SMP. Or I suppose you could say that IBM = was doing parallel processing even before that. =E2=80=9CReal time=E2=80=9D processing is requirements that responses to = events fall within the manufacture=E2=80=99s specifications. i.e. = =E2=80=9Call context switches are guaranteed to occur within 50ms=E2=80=9D= . Then the designers of the end applications can work with those = constraints and develop systems that meet the requirements of their end = users. SMP is about the very tight coupling between the CPUs. Apple=E2=80=99s = latest glossy keynote on the M1 Ultra gives a whiff of the problems that = parallel processing introduces which SMP solves.