From: doug@cs.dartmouth.edu (Doug McIlroy)
Subject: [TUHS] Unix clones
Date: Sat, 08 Apr 2017 11:22:23 -0400 [thread overview]
Message-ID: <201704081522.v38FMNjx017321@coolidge.cs.Dartmouth.EDU> (raw)
> That's interesting that that sort of thing dates back (at least) to the Labs.
Research couldn't hold a candle to Development on making smooth transitions.
You don't take a telephone switch offline to change a file format or the like.
The development cycle used to be about three years: one year for design,
one for implementation, and one to build a hybrid to bridge the transition.
At 2AM on Sunday, you'd install the hybrid on one of the dual cross-checked
processors at a time, so the switch was never interrupted. Later you'd
dispense with the hybrid the same way.
Doug
next reply other threads:[~2017-04-08 15:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-08 15:22 Doug McIlroy [this message]
-- strict thread matches above, loose matches on Subject: below --
2017-04-06 18:00 Clem Cole
2017-04-06 18:02 ` Clem Cole
2017-04-06 18:09 ` Clem Cole
2017-04-07 1:12 ` Wesley Parish
2017-04-07 21:58 ` Steve Johnson
2017-04-07 23:18 ` Steve Nickolas
2017-04-08 1:26 ` Jason Stevens
2017-04-06 1:18 Wesley Parish
2017-04-06 1:30 ` William Pechter
2017-04-06 9:40 ` Wesley Parish
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