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Comment: John Updike : Toward the End of Time (Score 1) 1365

by lightyear4 (#40915005) Attached to: Ask Slashdot: What's the Most Depressing Sci-fi You've Ever Read?
Though Updike is rarely considered in this genre, his "Toward the End of Time" is very much sci-fi and without question rather dark. It's a story of mortality and decline, set in a post-apocalyptic environment in the near future, following a nuclear war. The US has fallen into anarchy; men are no longer able to reach orbit. No grey goo, but nanotech run amok.

Comment: Re:Xen did it first (Score 1) 86

by lightyear4 (#28060061) Attached to: First Look At VMware's vSphere "Cloud OS"
Xen live migration does not involve 'continuous memory snapshotting' -- the referenced Kemari utilizes a combination of i/o triggers and observation of shadow page tables (nested page tables, ideally, if the hardware supports it. AMD's RVI and Intel's EPT). Kemari's equivalent of a lockstep vm gets only hot updates on dirtied pages, not a full memory snapshot. The alternative would of course be a rather inefficient design.

Comment: Re:Instantly? (Score 5, Informative) 86

by lightyear4 (#28059959) Attached to: First Look At VMware's vSphere "Cloud OS"
Instantly? Of course not. But the time required is equivalent to vmotion/live migration in bog-standard virtualization. How long? "That depends." To throw numbers at you, 30-100ms -- variance largely dependent upon how quickly your network infrastructure can react to MACs changing locations, whether in-flight TCP streams are broken as a result, etc. To help switches cope, people usually send a gratuitous ARP to jumpstart the process.

Comment: Xen did it first (Score 2, Informative) 86

by lightyear4 (#28059641) Attached to: First Look At VMware's vSphere "Cloud OS"
Check out the Kemari and Remus projects, which allow precisely the same in Xen environments. In essence, it's a continual live migration (vmware people, think continual vmotion) that resumes virtual machine execution on the backup node if the origin node dies. Very cool tech. The demonstration involved pulling the plug on one of the nodes. For more information just search, there are code and papers and presentation slides galore.

Comment: Silent films given voice (Score 3, Interesting) 117

by lightyear4 (#22115380) Attached to: Researchers Work To Perfect Computerized Lip Reading
Bringing audio and/or transcript to silent films is also where such technology is applicable. An excellent documentary about computerized lip reading to accomplish the very same may be found via google video : http://video.google.com/videoplay?docid=189608705425991617&hl=en . I know it's quite early for an indirect invocation of Godwin's Law, but the documentary content is nevertheless quite related to this topic. It is entitled "Hitler Speaks" in reference to silent videos filmed in Hitler's presence.

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