the logic of reversible computing Theory and Practice Robin - PowerPoint PPT Presentation

the logic of reversible computing Theory and Practice Robin Kaarsgaard February 26, 2018 DIKU, Department of Computer Science, University of Copenhagen robin@di.ku.dk http://www.di.ku.dk/~robin

a human perspective on a phd project We tend to think of scientists as devices with the signature Scientist Noise: Opinions, essays titled “XYZ considered harmful”, etc. 2 Funding ⊗ Coffee − − − − − → Science ⊗ Noise

overview • Reversible computing: What, how, why? • Reversibility from a denotational perspective • Theme: Reversible recursion • Models of reversible programming languages • Other work • Concluding remarks 3

reversible computing � �� As a consequence, reversible computers are just as happy running backwards as they are running forward. Functions computed by reversible means are injective . �� Reversible computing is the study of models of computation that �� exhibit both forward and backward determinism . �� 4 �� X X Previous Current Next

“I’m sorry, wait… you want to make computers do what ?” 5

reversible computing Information is physical. Landauer: Erasing information, no matter how you do it , costs Reversible computing: Computing without information erasure – avoids Landauer limit, potential to reduce power consumption of computing machinery. Incidental applications: Naturally invertible problems, has even seen applications in the programming of assembly robots(!) 6 energy: at least kT log ( 2 ) joules per bit of information, to be precise.

a broader perspective “So what is it that you do exactly ?” 7

a broader perspective “Caution!!!! Live bees // Part of a Master’s thesis study” 8

a broader perspective $,=’’;sub f{my($a,$r)=@_;@$a-$_||print@$a; for$c(0..$_-1){my($i,$b);for(@$a){$b=1,last if$c==$_||abs$c-$_==$r-$i++}!$b&&f( $A=[@$a,$c],$r+1)&&return$A}}f([]) (Credit: User vakorol at jagc.org) 9

a broader perspective Hypothesis formulated as a mathematical model , predictions extracted from this. Experiments replaced by formal proofs. Mathematical modelling tool of choice: Category theory. 10 Hypothesis Experiment Observation Prediction

the logic of reversible computing Theory and Practice Robin - PowerPoint PPT Presentation

the logic of reversible computing Theory and Practice Robin Kaarsgaard February 26, 2018 DIKU, Department of Computer Science, University of Copenhagen robin@di.ku.dk http://www.di.ku.dk/~robin a human perspective on a phd project We tend to

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