Date: Fri, 16 Oct 2015 11:06:01 -0500 From: Mark Felder <feld@FreeBSD.org> To: Cyril Vechera <cv@jet9.net>, dougb@FreeBSD.org, freebsd-hackers@freebsd.org, freebsd-rc@freebsd.org Subject: Re: rc(8) parallel tasks Message-ID: <1445011561.1233840.412174489.688C5822@webmail.messagingengine.com> In-Reply-To: <560EAC05.6050308@jet9.net> References: <560EAC05.6050308@jet9.net>
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On Fri, Oct 2, 2015, at 11:08, Cyril Vechera wrote: > Hi there. > > We've got a small launcher script (~250 loc) for parallel services > start/stop etc. It is used on our embedded systems and our users > containers. And I've done a proof of concept for implanting it to the > FreeBSD's standard /etc/rc for execution starting scripts in parallel. > It gave me a boot time reduction of rc part from 27 to 7 seconds, mostly > on eliminating jams for network or other long-latency resources waiting. > > The launcher is written in pure POSIX shell and uses FIFOs (named pipes) > as a mutexes for synchronization. So it is embedded into /etc/rc and > /etc/rc.d preserving rc.subr preloading. As a primary requirement, it > guarantees topological order (strict partial order) defined by > dependencies. It requires only POSIX shell, FreeBSD or Linux kernel, > mkfifo and a writeable file system. Due to last requirement, it can be > run on the late stage or should be supplied by some kinf of writtable > fs, ie tmpfs. The FreeBSD-integrated version uses standard rcorder > annotations (REQUIRE, BEFORE and PROVIDE) and there's no need to change > rc.d scripts > > It's not a full init replacement or a kind of services supervision tool. > It only starts or invokes a group of scripts in parallel with resolving > and assuring execution in dependencies order. > > Please take a look at the script and patch set for FreeBSD: > > https://github.com/cvss/jet9-multitask-init/blob/master/jet9-multitask-init > https://github.com/cvss/jet9-multitask-init/tree/master/examples/freebsd > > Your first link is a 404, but this looks really nice! -- Mark Felder ports-secteam member feld@FreeBSD.org
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