Guide:TAUChapel

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== MonteCarlo example == == MonteCarlo example ==
 +
 +To test out some Chapel's language features let program a MonteCarlo simulation to calculate PI. We can calculate PI by assess how many points with coordinates x,y fit in the unit circle, ie x^2+y^2<=1.
=== Basic === === Basic ===
 +
 +Here is the basic routine that computes PI:
 +
 + proc compute_pi(p_x: [] real(64), p_y: [] real(64)) : real {
 +
 + var c : sync int;
 + c = 0;
 + forall i in 1..n {
 + if radius(p_x[i], p_y[i]) then
 + c += 1;
 + }
 + return c * 4.0 / n;
 +
 + }
 +
 +Notice that the '''forall''' here will compute each iteration in parallel, hence the need to define variable '''c''' as a '''sync''' variable.
=== Procedure promotion === === Procedure promotion ===

Revision as of 03:26, 30 September 2013

Contents

Chapel

MonteCarlo example

To test out some Chapel's language features let program a MonteCarlo simulation to calculate PI. We can calculate PI by assess how many points with coordinates x,y fit in the unit circle, ie x^2+y^2<=1.

Basic

Here is the basic routine that computes PI:

proc compute_pi(p_x: [] real(64), p_y: [] real(64)) : real {

 var c : sync int;
 c = 0;
 forall i in 1..n {
   if radius(p_x[i], p_y[i]) then
       c += 1;
 }
 return c * 4.0 / n;

}

Notice that the forall here will compute each iteration in parallel, hence the need to define variable c as a sync variable.

Procedure promotion

Reduction

Multiple Locals

Performance Results

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