InformIT: Java Reference Guide Obtaining Sun Heap Information

* -verbose:gc - Prints some GC info
* -XX:+PrintGCDetails - PrintGC details
* -XX:+PrintGCTimeStamps - Adds timestamp info to GC details
* -XX:+PrintHeapAtGC - Prints detailed GC info including heap occupancy before and after GC
* -XX:+PrintTenuringDistribution - Prints object aging or tenuring information
* -XX:+PrintHeapUsageOverTime - Print heap usage and capacity with timestamps
* -Xloggc:filename - Prints GC info to a log file