process.memoryUsage() isn't quite right

[gbrail]

In particular, it does the following (calls from java.lang.Runtime()):

rss: totalMemory()
heapTotal: maxMemory()
heapUsed: totalMemory()

heapUsed ends up being the current size of the heap, regardless of how much is free. It should really be (totalMemory() - freeMemory()).

Given that, should "heapTotal" be "maxMemory" or "totalMemory"? Good question.

Also not sure what to do about "rss". Java doesn't tell us that specifically.

[gbrail]

Change this so that it will do the following, from java.lang.Runtime:

rss and heapTotal: totalMemory()
heapMax: maxMemory()
heapUsed: totalMemory() - freeMemory()

The result is that you'll be able to actually use heapUsed to see how far you are from the max.