scalechart.java

Java Threads, 2Ed (Source）

/*
 *
 * Copyright (c) 1997-1999 Scott Oaks and Henry Wong. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and
 * without fee is hereby granted.
 *
 * This sample source code is provided for example only,
 * on an unsupported, as-is basis. 
 *
 * AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. AUTHOR SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 *
 * THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
 * CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE
 * PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT
 * NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE
 * SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
 * SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE
 * PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES").  AUTHOR
 * SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR
 * HIGH RISK ACTIVITIES.
 */



import java.util.*;
import java.text.*;
import java.io.*;

public class ScaleChart {
	private int nIter = 200;
	private int nRows = 2000;
	private int nCols = 200;
	private int nThreads = 8;
	Class target;

	ScaleChart(int nIter, int nRows, int nCols, int nThreads, String className) {
		this.nIter = nIter;
		this.nRows = nRows;
		this.nCols = nCols;
		this.nThreads = nThreads;
		try {
			target = Class.forName(className);
		} catch (ClassNotFoundException cnfe) {
			System.out.println(cnfe);
			System.exit(-1);
		}
	}

	void chart() {
		long sumTime = 0;
		long startLoop = System.currentTimeMillis();
		try {
			ScaleTester st = (ScaleTester) target.newInstance();
			for (int i = 0; i < nIter; i++) {
				st.init(nRows, nCols, nThreads);
				long then = System.currentTimeMillis();
				float ans[][] = st.doCalc();
				long now = System.currentTimeMillis();
				sumTime += (now - then);
				if (nIter == 1)
					dump(ans, System.out);
			}
		} catch (Exception e) {
			e.printStackTrace();
			System.exit(-1);
		}
		long endLoop = System.currentTimeMillis();
		long calcTime = endLoop - startLoop;
		System.err.println("Loop time " + sumTime +
				 " (" + ((sumTime * 100) / calcTime) + "%)");
		System.err.println("Calculation time  " + calcTime);
	}

	public static void main(String args[]) {
		if (args.length != 5) {
			System.out.println("Usage: java ScaleTester nIter nRows nCols nThreads className");
			System.exit(-1);
		}
		ScaleChart sc = new ScaleChart(Integer.parseInt(args[0]),
										Integer.parseInt(args[1]),
										Integer.parseInt(args[2]),
										Integer.parseInt(args[3]),
										args[4]);
		CPUSupport.setConcurrency(Integer.parseInt(args[3]) + 5);
		sc.chart();
	}

	private void dump(float[][] ans, PrintStream ps) {
		NumberFormat nf = NumberFormat.getInstance();
		nf.setMaximumFractionDigits(4);
		for (int i = 0; i < ans.length; i++) {
			for (int j = 0; j < ans[i].length; j++)
				ps.print(nf.format(ans[i][j]) + " ");
			ps.println("");
		}
	}
}