Full gc or young gc from this gc log?

Question

I test java gc with macbook air, and got this gc log, but I don't know it's full gc or young gc with line 2 ?

[GC[DefNew: 7139K->146K(9216K), 0.0109670 secs] 7711K->6862K(19456K), 0.0109990 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 
[GC[DefNew: 6377K->6377K(9216K), 0.0000150 secs][Tenured: 6715K->8763K(10240K), 0.0094290 secs] 13093K->12988K(19456K), [Perm : 3441K->3441K(21248K)], 0.0094930 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 

vm options is below :

-Xms20M -Xmx20M -Xmn10M -XX:+UseSerialGC -XX:+PrintGCDetails

and my test source code :

    byte[] b1 = new byte[2 * 1024 * 1024];
    byte[] b2 = new byte[2 * 1024 * 1024];
    byte[] b3 = new byte[2 * 1024 * 1024];

    Thread.sleep(3000);
    System.out.println("after sleep 3 sec");

    byte[] b4 = new byte[2 * 1024 * 1024];
    System.out.println("after b4");

    byte[] b5 = new byte[2 * 1024 * 1024];
    byte[] b6 = new byte[2 * 1024 * 1024];
    System.out.println("after b6");
    /**
     *
     */
    byte[] b7 = new byte[2 * 1024 * 1024];

    Thread.sleep(3000);
    System.out.println("end");

Thanks ahead.

EDIT

I get some information from this link

Answer 1

DefNew

That's the serial new gen collector. Thus it's a minor GC.

You may want to use GCViewer to visualize GC logs.