CMS GC Log

[Sujit.Das at cognizant.com]

Trying to understand CMS-IM and CMS-RM log messages.
 
1. CMS Initial Mark
7465.472: [GC [1 CMS-initial-mark: 1370720K(2739200K)] 1384764K(3058176K), 0.0995109 secs]

In above log snippet, CMS IM was triggered at the old gen occupancy of 1370720 K with total size of old gen size as 2739200 K. What does 1384764 K and 3058176 K represent?

2. CMS Remark
7475.403: [weak refs processing, 0.0024767 secs] [1 CMS-remark: 1401865K(2739200K)] 1582866K(3058176K), 0.1290017 secs]
 
Similarly in above log snippet, CMS RM was triggered at the old gen occupancy of 1401865 K with total size of old gen size as 2739200 K. What does 1582866 K and 3058176 K represent?
 
Also, in GC output is there any way we can determine heap space used before and after a CMS collection? This is printed for minor collection but not sure if this is printed for CMS collection.
 
Thanks,
Sujit
 


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