DirectByteBufferSafePoint

DirectByteBufferSafePoint.java

import java.nio.ByteBuffer;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;

//java -Xlog:safepoint+stats -XX:+SafepointTimeout -Xmx10g  DirectByteBufferSafePoint.java
public class DirectByteBufferSafePoint {

    public static void main(String[] args) {
        ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
        new Thread() {
            @Override
            public void run() {

                while (true) {
//                    ByteBuffer buffer = ByteBuffer.allocateDirect(1024 * 1024); // 1 MB -> 2 ms
//                    ByteBuffer buffer = ByteBuffer.allocateDirect(10* 1024 * 1024); // 10 MB -> 18 ms
                    ByteBuffer buffer = ByteBuffer.allocateDirect(Integer.MAX_VALUE); // 1 MB -> 18 ms
                    buffer.asCharBuffer();
                }

            }
        }.start();

        while (true) {
            try {
                threadMXBean.dumpAllThreads(false, false);
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}