From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: References: From: Rob Pike Date: Mon, 2 Nov 2009 06:53:51 -0800 Message-ID: <7359f0490911020653l3765c917wc00e6886fbd2cdba@mail.gmail.com> To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: text/plain; charset=ISO-8859-1 Subject: Re: [9fans] original cpu server Topicbox-Message-UUID: 95660d64-ead5-11e9-9d60-3106f5b1d025 the first attempt was on a multi-headed vax whose model number escapes me. it was pretty foul architecturally. in early 1989 a restart was done for the 25-MHz mips CPU inside a 4-headed SGI shared-memory multiprocessor. the CPU had no synchronizing instructions but the SGI machine had a special piece of shared memory with locking properties. the kernel muxed locks onto sections of that memory. that system became real. a second machine became the file server. -rob