Date: Thu, 07 Mar 2002 08:39:34 +0100 (MET) From: Andy Sporner <sporner@nentec.de> To: Ronald G Minnich <rminnich@lanl.gov> Cc: Jason Fried <jfried@cluster.nix.selu.edu>, freebsd-cluster@FreeBSD.ORG Subject: RE: FreeBSD Cluster at SLU Message-ID: <XFMail.020307083934.sporner@nentec.de> In-Reply-To: <Pine.LNX.4.33.0203061105590.7642-100000@snaresland.acl.lanl.gov>
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Hi Ron, >> >> The idea is that whereever a process is started, it makes an entry in >> the process table. The PID's are assigned in a N-Modulus approach so that >> the PID determines the home node of the process. When a process migrates, >> it keeps it's entry on the home node and a new entry is created on the >> new host node. If it should move again, the home node is updated. I >> haven't >> started implementing or benchmarking this yet, so it could change, but that >> is the initial idea. > > this is very similar to bproc. Would a single hot-spare approach do the > job? > Well for scalability reasons, probably not. On the other hand, it would also be very bad to be playing "Hot Potatoe" with an unruly process that wants to dominate a machine resources. No doubt some very complicated handling will need to be added. I remember all the trouble they had with Numa and Quad Affinity. Resource affinity will have to also be looked at (like shared memory). I think you have convinced me to look into the effort of porting 'bproc' to FreeBSD. Certainly it would make a good starting point in the direction that I want to go--and reduce certain pains.. More on that later when I have had a look at it. > I do know there is a telecom company using bproc to do this type of thing. > >> Since the model is for making a scalable networking application platform, >> all of the aspects of the process move with the process (including sockets). > > movable sockets sure would be nice. > > your work sounds neat. > Thanks! Likewise! Andy To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-cluster" in the body of the message
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