打印当前系统内存使用情况

打印当前系统内存使用情况

private void showMemoryUsage() {
    Runtime runtime = Runtime.getRuntime();
    long free = runtime.freeMemory();
    long total = runtime.totalMemory();
    long used = total - free;

    long totalMB = total / (1024 * 1024);
    long usedMB = used / (1024 * 1024);
    LOG.debug("Memory usage: " + usedMB + " of " + totalMB + "M");
}