cache line size java

public class CacheLine {
    public static final int CACHE_LINE_SIZE = 64;
    public static final int SIZE = 1024 * 1024 * 1024;
    public static void main(String[] args) {
        new CacheLine().run();
    }

    private void test(byte[] a, int step, int count) {
        long startTime = System.currentTimeMillis();
        for (int qq = 0; qq < 50; qq++) {
            for (int i = 0, pos = 0; i < count; i += 1, pos += step) {
                a[pos] += 1;
            }
        }
        long endTime = System.currentTimeMillis();
        System.err.println(String.format("Step %d, time %d ms", step, endTime - startTime));
    }

    private void run() {
        byte[] aaa = new byte[SIZE];
        int step = 4;
        for (int cstep = step; cstep < 512; cstep += step) {
            test(aaa, cstep, 1024 * 1024);
        }
    }
}

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