option combinations

Michael Finocchiaro michael.finocchiaro at gmail.com
Sat Dec 13 23:48:59 PST 2008


I have found that NewRatio is overridden by almost any other flag and  
that it is recommended to use Xmn instead.
Also beware that CMS will set SurvivorRatio=1024 but that you can  
specify SurvivorRatio explicitly to override this.
All ParNewGC/CMS flags are unique to the low-pause collector (same  
goes for ParallelGC/ParallelOldGC for the throughout collector) except  
as Ramki said ParallelGCThreads.
I think that Java6 gave us control for the CMSThreads or am I mistaken?
Cheers,
Fino

Sent from Fino's iPhone 3G

On 14 déc. 08, at 08:40, Y Srinivas Ramakrishna  
<Y.S.Ramakrishna at Sun.COM> wrote:

>
>> i can't seem to find a comprehensive listing or matrix of which
>> options are valid with each other.
>>
>> does anyone know of such information?
>
> Unfortunately, no such documentation exists, as far as i know.
>
> If you have questions about specific combinations, we can try and
> answer them.
>
> We can, of course, also think about how one might go about
> documenting this combinatorial morass. Any suggestions/examples?
> (The general problem of transcription of the combinatorial
> possibilities is of course intractable, but the problem may well
> be tractable for HotSpot options by means of partitioning into  
> orthogonal
> subsets/"partitions".)
>
> -- ramki
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