The Price of the Free Lunch: Programming in the Multicore Era

Mul$core is the Norm 2 Cores 12 Cores 64 Cores Netbook Worksta$on Embedded System

CPUs don’t get Faster But Mul$ply GHz 3.8 4 3.33 3 6 cores 2 1.5 1 0.2 0 1990 1995 2000 2005 2010

Power Wall at 4 GHz

Power ≈ Voltage2  Frequency Voltage = -‐15% Power = 1 Frequency = -‐15% Performance ≈ 1.8

The Free Lunch is Over! *Excl. Performance Charge

Parallelism with Mainstream Approaches is Hard!

Mainstream: Shared State + Locks int i = 4 i = 3 || i = 5 | i | i := 4 i := 3 || i := 5 (define i 4) (set! i 3) || (set! i 5)

How Much is the Lunch? Experts Only Mere Mortals

Experts Build Complex Infrastructure Using Mainstream Approaches

Mainstream Approaches are not Problem-‐oriented

How to program parallel with ease?

Root of all Evil: Shared Mutable State int i = 4 i = 3 || i = 5 | i | i := 4 i := 3 || i := 5 (define i 4) (set! i 3) || (set! i 5)

Actors

Legacy Socware and Sequen$al Problems?

Automa$c Paralleliza$on!

Coevolu$on of Languages and Run$mes

The Virtual Machine of Tomorrow Hardware Language Smarter Support Support Run$mes

? an ! Hector Scheme ActPigoo ContextSTM

PPP: Parallel Programming GrouP Bruno Pascal Tom De Fraine Costanza Van CutsemTheo D’Hondt Charlotte Joeri Stefan Yves Herzeel De Koster Marr Vandriessche

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The Price of the Free Lunch: Programming in the Multicore Era

by Stefan Marr on Dec 07, 2010

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