// package jp.nminoru.benchmarks;

/*
 * Copyright (c) 2004 NAKAMURA Minoru. All rights reserved.
 */

// This program is ran under -Xmx64m -Xms64m options.


public class GcTest5 {
    static int     loop    = 1; 
    static Runtime runtime = Runtime.getRuntime(); 

    public static void main(String[] args) {
        System.gc();		
        System.out.println("[Start] the heap size: " 
                           + Long.toString(runtime.totalMemory() - runtime.freeMemory()) );

        for(int l=0 ; l<loop ; l++){
            System.out.println("Allocate a huge-size object.");
            int[] large_array = new int[1024 * 1024 * 4];

            System.gc();
            System.out.println("Current heap size.: " 
                               + Long.toString(runtime.totalMemory() - runtime.freeMemory()) );

            // 最適化を抑止するためのダミーコード
            for(int i=1 ; i<1000 ; i++){
                large_array[i] = large_array[i-1] + i;
            }
        }
        System.out.println("Lost the reference to huge-size object(s).");

        for(int i=0 ; i<9 ; i++){
            System.gc();
            System.out.println("Try to cause GC (" 
                               + Integer.toString(i+1) 
                               + ") : "
                               + Long.toString(runtime.totalMemory() - runtime.freeMemory()) );
        }
    }
}