Code for GraalVM GC Comparison

gistfile1.txt

public static void main(String[] args) {
    	for(int i =0;i<TopPublicTimeServers.publicTimeServers.length; i++) {
        	new LocalPublicTimeServerThread(TopPublicTimeServers.publicTimeServers[i]).start();
    	}
}
private class TopPublicTimeServers {
    	protected static String [] publicTimeServers = {
            	"time.google.com",
            	"time.cloudflare.com",
            	"time.facebook.com",
            	"time.windows.com",
            	"time.apple.com",
            	"time.nist.gov",
	}
}
private static class LocalPublicTimeServerThread extends Thread {

    public LocalPublicTimeServerThread(String name) {
        	this.name = name;
    	}

    public void run() {
   	 while(true) {
   		 long currNanoTime = System.nanoTime();
   		 try {
                    	// call individual time server and get the time
                    	startMonitor();
                	} catch (Exception e) {
                    	e.printStackTrace();
                	}
   	 }
    }

    public void startMonitor() throws Exception {
        	NTPUDPClient client = new NTPUDPClient();
        	// We want to timeout if a response takes longer than 10 seconds
        	client.setDefaultTimeout(10_000);
        	InetAddress inetAddress = InetAddress.getByName(name);
        	long start = getCurrentSystemTime();
        	TimeInfo timeInfo = client.getTime(inetAddress);
        	long end = getCurrentSystemTime();
        	long avgTime = ( start + end ) / 2;
        	timeInfo.computeDetails();
        	if (timeInfo.getOffset() != null) {
            	this.offset = timeInfo.getOffset();
        	}
        	TimeStamp systemNtpTime = TimeStamp.getCurrentTime();
        	TimeStamp.getCurrentTime().getFraction();
        	long nstTime = systemNtpTime.getTime();
        	logger.info("NST  time:   "  + nstTime);
        	logger.info("System time: " + avgTime);
        	if(nstTime > avgTime) {
            	logger.info("NST time is ahead by:" + Math.abs(avgTime - nstTime) + " milli seconds");
        	}
        	else if(nstTime < avgTime) {
            	logger.info("Local time is ahead by:" + Math.abs(avgTime - nstTime) + " milli seconds");
        	}
    	}
}