Java6 vs Java5

[Y.S.Ramakrishna at Sun.COM]

>> 3b) - If I am going to the throughput collector, is there anyway to 
>> force the application to keep
>> a certain amount of the heap free (ie -Xms=Xms=256M --) I always want to 
>> get say 100M free
>> so once the free heap drop to that level trigger a GC?  (Basically I 
>> want a CmsInitiatingOccupancyFraction
>> but for the throughput collector)

Do you want that much heap free in say the old generation?

What would be your rationale for wanting that kind of behaviour?
Looks to me you would be wasting that much of space since you
don't really get to allocate from it (or once you exceed that
level, each scavenge becomes a full gc at least as i read your
specification above).

-- ramki