Redacted memory-performance profiling for COMP-630/1

TmpProfiling.java

package edu.andover.yagarwal;


import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Scanner;

/**
 * Compare memory-speed tradeoff for reading UnicodeData.txt at once or not
 *
 * @author Yatharth Agarwal
 */
public class TmpProfiling {
    private static long tare = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

    private static long getMemory() {
        return (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory() - tare) / 1024 / 1024;
    }

    private static void testMemory() {
//        System.out.println("Before HashMap declared: " + getMemory() + " MB");
        HashMap<Integer, String> NAME_MAP = new HashMap<>();
//        System.out.println("After HashMap declared: " + getMemory() + " MB");

        try {
            Scanner unicodetxt = new Scanner(new File("UnicodeData.txt"));
            while (unicodetxt.hasNextLine()) {
                /* SOME CODE HERE */
                NAME_MAP.put(codepoint, name);
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("HashMap took " + getMemory() + " MB of space");

        NAME_MAP = null;
        System.gc();
//        System.out.println("(After HashMap deleted: " + getMemory() + " MB");

    }

    private static void testSpeed() {
        long start = System.currentTimeMillis();

        try {
            Scanner unicodetxt = new Scanner(new File("UnicodeData.txt"));
            while (unicodetxt.hasNextLine()) {
                /* SOME CODE HERE */
                if (codepoint == 0xE01EF) {
                    break;
                }
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }

        double time = (System.currentTimeMillis() - start) / 1000.0;
        System.out.println("Scan took " + time + "s till almost the end");
    }

    public static void main(String[] args) {
        testMemory();
        testSpeed();
    }
}