CSC/ECE 506 Spring 2010/ch 3 yl: Difference between revisions

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  '''for'''    i:=2:N-1 '''do''' A(i):=[A(i-1) + A(i) + A(i+1)]/3; '''next''' i;
  '''for'''    i:=2:N-1 '''do''' A(i):=[A(i-1) + A(i) + A(i+1)]/3; '''next''' i;
  '''forall''' i:=2:N-1 '''do''' A(i):=[A(i-1) + A(i) + A(i+1)]/3;
  '''forall''' i:=2:N-1 '''do''' A(i):=[A(i-1) + A(i) + A(i+1)]/3;
'''for''' (i=2; i<=n; i+=2)
  '''s''': a[i] = a[i-2];
'''for''' (i=3; i<=n; i+=2)
  '''s''': a[i] = a[i-2];


===DOACROSS===
===DOACROSS===

Revision as of 19:35, 20 February 2010

Supplement to Chapter 3: Support for parallel-programming models. Discuss how DOACROSS, DOPIPE, DOALL, etc. are implemented in packages such as Posix threads, Intel Thread Building Blocks, OpenMP 2.0 and 3.0.

Parallel-programming models

DOALL

for    i:=2:N-1 do A(i):=[A(i-1) + A(i) + A(i+1)]/3; next i;
forall i:=2:N-1 do A(i):=[A(i-1) + A(i) + A(i+1)]/3;

for (i=2; i<=n; i+=2)
 s: a[i] = a[i-2];
for (i=3; i<=n; i+=2)
 s: a[i] = a[i-2];

DOACROSS

for i:=2:N-1 do A(i):=[A(i-1) + A(i) + A(i+1)]/3; next i; forall i:=2:N-1 do A(i):=[A(i-1) + A(i) + A(i+1)]/3;

DOPIPE

Implementation

References

  1. wikipedia: Parallel Computing
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