gctest.java

高质量Java程序设计 源代码

package net.betterjava.sample.xml.bind.test;
import java.io.FileNotFoundException;
import java.io.IOException;

public class GCTest {

	private static void description() {
		System.out.println("usage: java -jar GCTest.jar -round -thread -root");
		System.out.println("-round\t round of test, an integer greater than zero");
		System.out.println("-thread\t number of thread, an integer greater than zero");
		System.out.println("-root\t the directory of input data file ");
	}

	private static void warming(String root)
		throws IOException, FileNotFoundException, InterruptedException {

		int thread = 5;
		int round = 50;
		ServerSimulation[] server = new ServerSimulation[thread];
		Semaphore smp = new Semaphore(thread, round);
		for (int i = 0; i < thread; i++) {
			server[i] = new ServerSimulation(smp, root + "template.xsd");
		}

		for (int i = 0; i < thread; i++) {
			server[i].start();
		}

		for (int i = 0; i < thread; i++) {
			server[i].join();
		}
		System.gc();
		long time = System.currentTimeMillis();
		int temp = 0;
		for (int i = 0; i < 1000; i++) {
			temp = 0;
			for (int j = 0; j < 10000; j++) {
				temp++;
			}
		}
		System.out.println("warming time: " + (System.currentTimeMillis() - time));
	}

	public static void main(String[] args) {
		if (args.length != 3) {
			description();
			return;
		}
		int round;
		int thread;
		String root = ".\\";
		try {
			round = Integer.parseInt(args[0]);
			thread = Integer.parseInt(args[1]);
			root = args[2];
		} catch (NumberFormatException e) {
			description();
			return;
		}
		if (round <= 0 || thread <= 0) {
			description();
			return;
		}

		try {
			warming(root);

			ServerSimulation[] server = new ServerSimulation[thread];
			Semaphore smp = new Semaphore(thread, round);

			for (int i = 0; i < thread; i++) {
				server[i] = new ServerSimulation(smp, root + "template.xsd");
			}

			for (int i = 0; i < thread; i++) {
				server[i].start();
			}

			for (int i = 0; i < thread; i++) {
				server[i].join();
			}

			System.out.println(round + " is " + smp.getElapseTime());
		} catch (FileNotFoundException e) {
			e.printStackTrace(System.out);
		} catch (IOException e) {
			e.printStackTrace(System.out);
		} catch (InterruptedException e) {
			e.printStackTrace(System.out);
		}
	}
}