Date: Fri, 2 Oct 2015 10:35:33 -0700 From: Larry Maloney <larry.maloney@hackerdojo.com> To: Cyril Vechera <cv@jet9.net> Cc: freebsd-hackers@freebsd.org Subject: Re: rc(8) parallel tasks Message-ID: <3B7471C5-16B2-41B0-809F-48BADF037357@hackerdojo.com> In-Reply-To: <560EADD2.60905@jet9.net> References: <560EADD2.60905@jet9.net>
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Awesome Sent from my iPhone > On Oct 2, 2015, at 9:16 AM, Cyril Vechera <cv@jet9.net> 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 > > > -- > Cyril Vechera > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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