How to read a verbose:GC output?

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You can find tutorials on interpreting verbose GC output eg. in:

Looking at verbosegc output tutorial – Java 7, you can see YoungGen space analysis:

UPDATE 03/27/2014: The “Collection time (secs)” is actually a Timestamp showing the when the GC occurred. The Collection times are reported as Times=user=0.45 sys=0.01, real=0.14 secs].

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Here, the 262208K->137900K(100428K) means Java Heap before GC-> Java Heap after GC (Total Size of the Java Heap).

And, OldGen space analysis:

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