From owner-freebsd-current@FreeBSD.ORG Thu Feb 3 10:12:45 2005 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4BFE416A4CE; Thu, 3 Feb 2005 10:12:45 +0000 (GMT) Received: from itchy.rabson.org (mailgate.nlsystems.com [80.177.232.242]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2247043D45; Thu, 3 Feb 2005 10:12:44 +0000 (GMT) (envelope-from dfr@nlsystems.com) Received: from ns0.nlsystems.com (ns0.nlsystems.com [80.177.232.243]) by itchy.rabson.org (8.12.11/8.12.11) with ESMTP id j13ACSAJ024275; Thu, 3 Feb 2005 10:12:28 GMT (envelope-from dfr@nlsystems.com) From: Doug Rabson To: freebsd-current@freebsd.org Date: Thu, 3 Feb 2005 10:12:21 +0000 User-Agent: KMail/1.7.1 References: <20050201101113.J572@localhost> <200502011913.j11JDXsf084862@khavrinen.lcs.mit.edu> <20050202094256.K88344@localhost> In-Reply-To: <20050202094256.K88344@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200502031012.22602.dfr@nlsystems.com> X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.64 X-Spam-Checker-Version: SpamAssassin 2.64 (2004-01-11) on itchy.rabson.org X-Virus-Scanned: clamd / ClamAV version 0.75.1, clamav-milter version 0.75c on itchy.rabson.org X-Virus-Status: Clean cc: current@freebsd.org cc: Peter Jeremy cc: Julian Elischer cc: Garrett Wollman Subject: Re: cynchronised sleep capbilty.. X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Feb 2005 10:12:45 -0000 On Wednesday 02 February 2005 17:44, Julian Elischer wrote: > very clever! > > however it doesn't phaselock to teh time and still drifts. > I need to trigger on (for example) 10 second boundaries across 50 > synchronised machines.. > (so thatthe machines agree about the sampling period.) How about a cron job which writes characters into a fifo every ten secconds. The script can wait for the next ten second mark by reading a single char from the other end of the fifo.