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=1; i<=N; i++) { | |||
'''S:''' a[i] = a[i-1] + b[i] * c[i]; | |||
} | |||
===DOPIPE=== | ===DOPIPE=== | ||
Revision as of 19:36, 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;
for (i=1; i<=N; i++) {
S: a[i] = a[i-1] + b[i] * c[i];
}