Proposal: MaxTenuringThreshold and age field size changes
Tony Printezis
tony.printezis at sun.com
Thu May 29 19:57:40 UTC 2008
Thomas,
Thomas Viessmann wrote:
> > If MTT is set by the user to a value > max age, we will actually set
> it to max age.
>
> Agree. Still most customers use 32.
Even though they might use 32, it doesn't mean that the GC will actually
use the "never tenure" policy. The actually tenuring threshold is
actually auto-tuned by the GC so, if the GC notices that space in the
survivor spaces is tight, it might lower the tenuring threshold
irrespective of MTT. So, a lot of customers will get the autotuning
policy if they set MTT to 32, not never tenure.
> Actually most if not all customers missed that change. I always see
> 32 or 0. Nothing in between.
Oh, I've seen lots in between. :-)
Tony
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