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Codeville

Codeville. Revision control computer program Written by Ross Cohen with some design by Bram Cohen Use Python Use merging algorithm called “ Codeville merge” Used by BitTorrent , Mosuki Revision control Synonym Version control, Source control, (Source) code management (SCM)

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Codeville

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  1. Codeville • Revision control computer program • Written by Ross Cohen with some design by Bram Cohen • Use Python • Use merging algorithm called “Codeville merge” • Used by BitTorrent, Mosuki • Revision control • Synonym • Version control, Source control, (Source) code management (SCM) • The management of changes to stored computer files as • Documents, programs, and other information • Most commonly used in software development • Team of people may be changing the same files • Identified by a “revision number”, or “revision level” • A number or letter code • Ex > “revition 1”, “revision 2”, and so on

  2. Nash equilibrium vs. Pareto efficiency • Both in game theory • Solution concept of a game • Involving two or more players • Nash Equilibrium is not Pareto efficient • The player’s payoffs can all be increased • Payoffs • Numbers representing the outcomes or motivations of players • Cardinal payoffs • Profit, quantity, “utility”, or other continuous measures • Ordinal payoffs • Rank the desirability of outcomes

  3. Nash equibrium • Each player is assumed to know • The equilibrium strategies of the other players • In response to a competitor • Choose the best strategy • No gain unilaterally by changing its own strategy Without competitor’s change of strategy • No necessarily the best cumulative payoff • The only concern is whether one payoff is larger than another • Ordinal payoffs

  4. Pareto efficiency • Measure of efficiency • In cooperative theory • Without someone else’s loss, no one can gain more • The best cumulative payoffs • Cardinal payoffs

  5. Example • Prisoner’s dilemma • If both prisoners connive, both get 1-year punishments • If both prisoners confess, both get 10-year punishments • If one prisoner confesses & the other connives, 3-year & 15-year punishments, respectively • 4 cases Pareto efficient Nash equilibrium

  6. Reference • Wikipedia • http://www.wikipedia.org • Codeville • Nash equilibrium • Pareto efficient • Game Theory.net • http://www.gametheory.net/dictionary • Nash equilibrium • Pareto efficient • Payoffs • Nash equilibrium and Mechanism Design • http://www.sss.ias.edu/publications/papers/econpaper86.pdf

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