MaxTenuringThreshold available in ParNewGC?

[Srinivas Ramakrishna]

I recommend Charlie's excellent book as well.

To answer yr question, yes, CMS + Parew does use MaxTenuringThreshold
(henceforth MTT),
but in order to allow objects to age you also need sufficiently large
survivor spaces to hold
them for however long you wish, otherwise the adaptive tenuring policy will
adjust the
"current" tenuring threshold so as to prevent overflow. That may be what
you saw.
Check out the info printed by +PrintTenuringThreshold.

-- ramki

On Tue, Jan 10, 2012 at 1:31 AM, Li Li <fancyerii at gmail.com> wrote:

> hi all
>    I have an application that generating many large objects and then
> discard them. I found that full gc can free memory from 70% to 40%.
>    I want to let this objects in young generation longer. I found
> -XX:MaxTenuringThreshold and -XX:PretenureSizeThreshold.
>    But I found a blog that says MaxTenuringThreshold is not used in
> ParNewGC.
> And I use ParNewGC+CMS. I tried to set MaxTenuringThreshold=10, but it
> seems no difference.
>
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