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[72.197.247.231]) by smtp.gmail.com with ESMTPSA id b15sm3369872pft.58.2020.01.10.07.00.08 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 10 Jan 2020 07:00:08 -0800 (PST) To: tuhs@minnie.tuhs.org References: <9c507ef665851fd21ecdf0e23136dc86@firemail.de> <1ippPk-8PE-00@marmaro.de> From: Mary Ann Horton Message-ID: <81cf0f73-2141-10c9-7352-51c0aac76959@mhorton.net> Date: Fri, 10 Jan 2020 07:00:08 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Subject: Re: [TUHS] screen editors / machine load 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: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" Yes, it was a real concern. Physical memory on the shared PDP-11 was limited, and if everyone had a separate copy of vi running the machine would swap itself silly. This only mattered if everyone had their own separate copy of vi installed. The fix was to put vi in a single system directory, such as /usr/ucb or /exptools. The instruction part of its memory would be shared among all the users, resulting in much less swapping. In the early days, people tended to have their own personal copy because the Berkeley tools did not come standard with UNIX, especially at Bell Labs. That was one of the main motivations for Exptools (the "experimental tools"), which were basically 2BSD's applications and some other tools like Warren Montgomery's emacs. Disk space and people's time spend installing were also good reasons.     Mary Ann On 1/10/20 5:41 AM, Mike Markowski wrote: > seeing him fire up vi was practically sci-fi to me.  He showed me a > few commands and vowed me to secrecy for fear if all students started > using it, it would bring the 11/70 to its knees.  Were multiple vi > sessions really such a potential burden to the machine?  I wouldn't > think so with the slow nature of human i/o, yet there certainly were > times when the pdp-11/70 crashed as project due dates loomed closer > and closer!