Util.java

/**
 * Some utility methods for the BH application
 * @author Robert L. Bocchino Jr.
 * @date July 2008
 */
package DPJBenchmarks;

import java.util.Formatter;
import DPJRuntime.*;

public class Util {
    public static final double A = 16807.0;
    public static final double M = 2147483647.0;
    
    /** 
     * Return a random number, which is also the next seed. 
     *
     * @param seed  The random number seed
     */
    public static double rand(double seed) {
	double t = A*seed  + 1;
	seed = t - (M * Math.floor(t / M));
	return seed;

    }

    /**
     * Generate floating-point random number
     */
    public static double xrand(double xl, double xh, double r) {   
	double res;
	res = xl + (xh-xl)*r/2147483647.0;
	return res;
    }

    /**
     * Formatted output
     */
    public static boolean chatting(String fmt, Object... args) {
	Formatter f = new Formatter(System.out);
	f.format(fmt, args);
	return true;
    }

    public static void printResults(String name) {
	System.out.print(name + ": Amdahl=");
	System.out.print(Instrument.amdahlBound());
	System.out.print(", ideal=");
	System.out.print(Instrument.idealSpeedup());
	System.out.print(", serial time=" + Instrument.getSerialTime()/1000000000.0);
	System.out.println(", parallel time=" + Instrument.getParallelTime()/1000000.0);
    }
}