# Take the following Arc-Length-

Take the following Arc-Length-Integral code to compute the perimeter of an Ellipse code and parallelize it in OpenMP and make a table Like the below and include it in the comments at the front:

// Timing for 19 ones in a row: //

Time of run: ___ ___ ___

Problem: Compute the perimeter of an Ellipse (axis coordinates (2,0)(0,1)(-2,0)(0,-1)) for the first quarant and the multiply by 4. Use the arc-length integral, aproximated by one million, ten million, one hundred million, and 1 billion line segments…

#define f(x) sqrt(1 – ((x)/2)*((x)/2) ) double x, y, stepsize , length ; int numintervals = 1000000 ; stepsize = 2.0 / (double (numintervals) ;

for (x=0 ; x <=2.0; x += stepsize ) { delta_y = f(x+stepsize) – f(x) ; // delta_y = y1 – y0 = f(x1) – f(x0) where f(x) = sqrt(1 – (x/2)*(x/2) ) length = sqrt( (stepsize*stepsize) + (delta_y*delta_y)) ; }

Test this out in serial mode, then parallelize, then collect table of run-times for 1, 2, and 4 threads.

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