Re: Random disk cache expiry
For those thinking of playing with predictive caching (likely an area of considerable student endeveour/interest these days at both filesystem and web level): --- Matthew Dillon: So there is no 'perfect' caching algorithm. There are simply too many variables even in a well defined environment for even the best system heuristics to cover optimally. --- David Schultz: If that proves to be infeasible, I'm sure there are ways to approximate the same thing. The hard parts, I think, would be teaching the VM system to use the new information, and gathering statistics from which you form your hints. --- Right. It's easy if you know the complete future of the total system state, which of course you never will. Someone interested in this might try to apply the latest in machine learing techniques, classifiers, etc., to the online problem. Variants of this are receiving lots of attention in areas such as gene sequence prediction. I dunno, but it seems like a lot of the math ends up pretty similar to economics, and we all know how well those models work. Kind of funny, running an economic simulation in your kernel... but actually getting possible at some level, at least for research systems with modern machines. There was a time when you would be fired for putting floating-point in an OS. http://csl.cse.ucsc.edu/acme.shtml : Many cache replacement policies have been invented and some perform better than others under certain workload and network-topological conditions. It is impossible and sub-optimal to manually choose cache replacement policies for workloads and topologies that are under continuous change. We use machine learning algorithms to automatically select the best current policy or mixtures of policies from a policy (a.k.a expert) pool to provide an adaptive caching service. - bruce To Unsubscribe: send mail to [EMAIL PROTECTED] with unsubscribe freebsd-hackers in the body of the message
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Lower power SMP boxes?
I've slowly been trying to trim down the power use in my machine room, oweing to astronomical PGE bills :-(. I'm using those wonderful little EPIA series mini-itx motherboards (purchased from idot.com) as low/medium performance servers. They aren't all that fast but one will run a web site, pop/sendmail, and an ordb nameserver just dandy and can copy files over NFS at 7MBytes/s. That covers UP systems quite well. But MP is another story. At some point I would like to put together some SMP test boxes that don't cost the equivalent of rent on a small apartment in electricity use. They don't have to be super-fast, they just need to be SMP. I'm not talking about blade servers here, I'm talking about SMP boxes for testing purposes. Anyone have any ideas? -Matt To Unsubscribe: send mail to [EMAIL PROTECTED] with unsubscribe freebsd-hackers in the body of the message
Re: Lower power SMP boxes?
At 3:12 PM -0800 1/31/03, Matthew Dillon wrote: But MP is another story. At some point I would like to put together some SMP test boxes that don't cost the equivalent of rent on a small apartment in electricity use. They don't have to be super-fast, they just need to be SMP. I'm not talking about blade servers here, I'm talking about SMP boxes for testing purposes. Anyone have any ideas? The arrival of FreeBSD/PPC might give you some cheaper options. -- Garance Alistair Drosehn= [EMAIL PROTECTED] Senior Systems Programmer or [EMAIL PROTECTED] Rensselaer Polytechnic Instituteor [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with unsubscribe freebsd-hackers in the body of the message
Re: Lower power SMP boxes?
But MP is another story. At some point I would like to put together some SMP test boxes that don't cost the equivalent of rent on a small apartment in electricity use. They don't have to be super-fast, they just need to be SMP. I'm not talking about blade servers here, I'm talking about SMP boxes for testing purposes. Anyone have any ideas? http://www.theinquirer.net/?article=7434 might be of interest. -cg To Unsubscribe: send mail to [EMAIL PROTECTED] with unsubscribe freebsd-hackers in the body of the message
