Application memory use

[Michael Hall]

On Apr 23, 2012, at 5:38 AM, Kirk Pepperdine wrote:

> CMS will leave floating garbage which will be picked up on the next collection. The parallel collectors will be exact and thus the working or live set size after GC will always be larger when using CMS.
> 

There seemed to be more than a one collection difference between the numbers. Real mem per Activity Monitor was double.

JConsole Comparison
Used: 1.7 is 4.10 times greater than 1.6
Committed:  1.7 is 5.47 times greater than 1.6
Max: no significant difference
GC time:* 1.7 is 2.14 times greater than 1.6

* For GC time I summed the two times for each and divided the 1.7 sum by the 1.6.
For all the others I just divided the 1.7 value by the 1.6.

I'm not real familiar with the functioning of gc but most of these differences didn't seem minor.
I'll see if I can reproduce and get some JConsole screen shots. Very different.