Date: Sun, 21 Aug 2011 14:15:10 +0200 From: kilian <kklimek@uos.de> To: freebsd-hackers@freebsd.org Subject: Concurrent execution of rc-scripts with rcorder(8) Message-ID: <20110821121509.GA27730@crane.none>
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Hello, the idea to start services concurrently during boot isn't new and the question why FreeBSD doesn't do it has popped up on the forum and mailing list occasionally. So, why not give it a shot? rcorder(8) is normally used during boot to bring the rc-scripts into a particular order, so when they are executed linearly by /etc/rc, all constraints will be satisfied. I modified rcorder(8) to enable it to run rc-scripts concurrently, while keeping track of the constraints as rc-scripts start and finish. You can find the code at https://github.com/kil/rcorder. As it works now, it will fall back to the current mode of execution if anything goes wrong. So, if worst comes to worst, booting takes a bit longer. If you feel brave, give it a try (Actually, not too much bravery is needed: on all boots of my machine it worked perfectly every time.) I haven't done any measurements yet on how large the speedup is, but booting feels a bit faster with it. Also, there probably is room for improvement. Any ideas and feedback are very welcome! -kilian
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