Can CMS maximum free chunk size provide advance warning before full GC?

[Bernd Eckenfels]

Am 29.04.2013, 20:53 Uhr, schrieb Jon Masamitsu <jon.masamitsu at oracle.com>:
> I think that the use of maximum free chunk size as your metric is a good
> choice.  It is very conservative (which sounds like what you want) and
> not subject to odd mixtures of object sizes.
>
> For G1 I think you could use the number of completely free regions.
> I don't know if it is printed in any of the logs currently but it is
> probably
> a metric we maintain (or could easily).  If the number of completely free
> regions decreases over time, it could signal that a full GC is coming.

And it would be great to have both in the (Same) MXBean Attribute for  
application self monitoring.

Gruss
Bernd
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