Lets get Physical! Spot the Differences Too
Wingett, Yvonne, Maricopa County Reporter has reference to this Academic Journal, PHwiki organized this Journal Lets get Physical!ETH Zurich Distributed Computing www.disco.ethz.ch ICALP 2010 Roger WattenhoferSpot the DifferencesToo Many!
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Spot the DifferencesStill Many!Spot the Differences
Better Screen Bigger Disk More RAM Cooler Design Better Screen Bigger Disk More RAM Cooler Design Same CPU Clock SpeedClock speed flattening sharplyTransistor count still risingAdvent of multi-core processors!
The Future of ComputingWhy Should I CareComputer Science Washing Machine Science[Roger Boyle, Maurice Herlihy]
Algorithms Algorithm Input Outputsimple in addition to robust modelcomparable resultscomplexity theory Algorithm Input Output
Input Outputvs. Algorithmvs.The Future of Computing
Talk OverviewIntroduction & MotivationSome Examples as long as Physical AlgorithmsWhat are Physical AlgorithmsWell-Known Examples
Small World Phenomenon Statistical PhysicsProperties of r in addition to om graphsStatic view Statistical PhysicsProperties of r in addition to om graphsStatic viewPhysical AlgorithmsPeople will make decisions[Kleinberg 2000]
Natural Algorithms[Bernard Chazelle, 2009]
Clock SynchronizationGlobal Positioning System (GPS)Radio Clock SignalAC-power line radiationSynchronization messagesClock Synchronization in NetworksGlobal Positioning System (GPS)Radio Clock SignalAC-power line radiationSynchronization messagesClock Synchronization in Networks
Time (logical clocks) should not be allowed to st in addition to still or jump Lets be more careful ( in addition to ambitious): Logical clocks should always move as long as ward Sometimes faster, sometimes slower is OK. But there should be a minimum in addition to a maximum speed.As close to correct time as possible!Time Must Behave!Local Skew Tree-based Algorithms Neighborhood Algorithms e.g. FTSP e.g. GTSPBad local skewSynchronization Algorithms: An Example (Amax)Question: How to update the logical clock based on the messages from the neighbors Idea: Minimizing the skew to the fastest neighbor
Wingett, Yvonne Maricopa County Reporter
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