Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!watmath!clyde!bonnie!akgua!sdcsvax!dcdwest!ittvax!decvax!genrad!teddy!panda!talcott!harvard!seismo!brl-tgr!tgr!speck@cit-vax From: speck@cit-vax (Don Speck) Newsgroups: net.unix-wizards Subject: Re: How to make 4.2BSD ``/etc/dumps faster Message-ID: <6881@brl-tgr.ARPA> Date: Tue, 1-Jan-85 10:11:58 EST Article-I.D.: brl-tgr.6881 Posted: Tue Jan 1 10:11:58 1985 Date-Received: Thu, 3-Jan-85 04:34:17 EST Sender: news@brl-tgr.ARPA Organization: Ballistic Research Lab Lines: 12 I've been working on my own speed mods for dump - with changes in only ONE source file (/usr/src/etc/dump/dumptape.c), NO kernel changes, it runs the TU77 on our 780 at its full 125 ips. I'll get my chance to try it on a TU80 next week. I hope to mail off the file to unix-sources shortly afterward, if there are no licensing problems. Chris: I'd be interested in seeing your approach. I turned 'dump' into a concurrent program communicating with pipes and signals: while one process writes the tape, the others read the disk and communicate. There's always (exactly) one process writing the tape at any time. Don Speck Caltech (818) 356-6886