Plot different graphs based on jstat

For more info on jstat please refer to - https://docs.oracle.com/javase/8/docs/technotes/tools/windows/jstat.html

Track the size of the young and old generation

jstat -gccapacity <java process id> 1000 > heap_size.txt

Plot young and old generation size

./plot_heap_size.py -i /path/to/heap_size.txt -o /path/to/generate/the/plots

Help

./plot_heap_size.py -h