Leiserson and Pablo Halpern 48 Socrates Paradox Original program T 32 = 65 seconds Proposed program T′ 32 = 40 seconds TP T 1/P + T∞ T 1 = 2048 seconds T ∞ = 1 second T′ 1 = 1024 seconds T′∞ = 8 seconds T 32 = 2048/32 + 1 = 65 seconds T′ 32 = 1024/32 + 8 = 40 seconds T 512 = 2048/512 + 1 = 5 seconds T′ 512= 1024/512 + 8 = 10 seconds © 2009 Charles E. ∙ The Cilk++ toolset includes hyperobjects, Cilkscreen and Cilkview © 2009 Charles E. Leiserson Supercomputing Technologies Research Group Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Multi-core processors P $ … P $ Network Memory I/O MIMD – shared memory Cilk Overview • Cilk extends the C language with just a handful of keywords: cilk, spawn, sync • Every Cilk program has click for source serial semantics. Leiserson and Pablo Halpern 51 Cilk++ and Cilkview ∙ The cilk_spawn, cilk_sync, and cilk_for features of the Cilk++ language are composable so that one can reason about a piece of a program without following every spawn down to its leaves.

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Compile and run a sample program 3.
On July 31, 2009, Cilk Arts announced on its web site that its products and engineering team were now part of Intel Corp. Multithreaded ComputationThe dag G = (V, E) represents a
parallel instruction stream. You can manually add csh variables so they run everytime you login by placing them in the file ~/. Multi-core processors.

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The original Cilk required any function using these to be annotated with the cilk keyword, which is gone as of Cilk Plus. Numbers = size*size: int Girdlen = num. Scalability Analysis © 2009 Charles E. Complete step P threads ready. In early 2010, the Cilk website at www. There is a way to kill all your processees off every omicron machine.

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Complete step P threads ready. Each vertex v 2 V represents a (Cilk)
thread: a maximal sequence of instructions not containing parallel
control (spawn, sync, return). July 13, 2006 *Parallelizing Vector AdditionCCif (nJuly 13, 2006 *if (nWork: T1 = ?Span: T1 = ?Parallelism: T1/T1 = ?(n/lg n)(n)Vector
Addition AnalysisTo add two vectors of length n, where BASE =
(1):(lg n)BASE(1)(n)Analysis(n)To add two vectors of length n, where BASE =
(1):BASEParallelism: T1/T1 = ?(n )Optimal Choice of BASETo add two
vectors of length n using an optimal choice of BASE to maximize
parallelism:Work: T1 = ?(n)BASESpan: T1 = ?(BASE + n/BASE)Choosing
BASE = n ) T1 = (n)Weird! Dont we want to remove recursion?Parallel Programming =
Sequential Program + Decomposition + Mapping + Communication and
synchronizationJuly 13, 2006 *SchedulingCilk allows the programmer to express potential
parallelism in an application. © 2009 Charles E. The Cilk scheduler maps Cilk threads
onto processors dynamically at runtime.

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2006, the market for Cilk was restricted to high-performance computing. Adapted from. Steal! P P P PCilk’s Work-Stealing Scheduler When a processor runs out of work, it steals a thread from the top of a random victim’s deque. The base case and sum use a send_argument(k, n) operation to this hyperlink their continuation variable k to the value of n, effectively “returning” the value to the successor thread.

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3 or later. For example:The OpenCilk compiler is based on a recent stable version of the LLVM clang
compiler. . P.

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It is because these responsibilities are separated that a Cilk program can run without rewriting on any number of processors, including one. . July 13, 2006 14 Example: fib(4) 1 2 3 4 8 7 6 5 Assume for simplicity that each Cilk thread in fib() takes unit time to execute. During linking, it ensures the program
is properly linked with the OpenCilk runtime library.

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PPPPSteal!Cilks Work-Stealing SchedulerEach processor maintains a work
deque of ready threads, and it manipulates the bottom of the deque
like a stack. § Control cannot pass through a cilk_sync until all child functions have completed. P Cilk’s Work-Stealing Scheduler Each processor maintains a work look here of ready threads, and it manipulates the bottom of the deque like a stack. .