Egor Pasko wrote:
On the 0x1E4 day of Apache Harmony Oliver Deakin wrote:
Forcing gc by hand does work, but it is difficult for code to know
when to
call gc.So I think it is better if VM can give some support since it
knows
the global situation.:)
..and of course a manual gc() call does not necessarily result in a gc
this one is easy :) make a gc2() magic in DRLVM and collect only young
objects on it.. to make code portable, implement gc2() as gc() for
other JVMs. Need to be patient until the generational GC.
Can a hack like this be widely accepted in Java community? I think, yes.
I think GC research will soon make this unnecessary. For example the
Sun VM has a concurrent collector for its mature space, so on a
sufficiently lightly loaded system (or with a core to spare) you could
eliminate most of the mature space collection pause time.
In MMTk, there is a command line switch, -X:gc:fullHeapSystemGc, used to
specify whether System.gc() causes a full heap collection. But no, I
don't think this is something users should need to play with.
cheers
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