Java6 vs Java5

Y.S.Ramakrishna at Sun.COM Y.S.Ramakrishna at Sun.COM
Fri Mar 27 12:54:17 PDT 2009


On 03/27/09 11:43, Jon Masamitsu wrote:
> Shaun Hennessy wrote On 03/27/09 11:20,:
...
>> 2) Was there a change in the default CMS initiating occupancy from Java5 
>> to Java6 (68% to 92%)
>> when using CMS?
>>  
>>
> 
> Unless explicitly set on the command line the initiating occupancy is
> calculated
> from other parameters (MinHeapFreeRatio and MinHeapFreeRatio) and
> I don't think those latter changed between 5 and 6.  Other CMS
> parameters changed.
> 
> http://java.sun.com/javase/6/docs/technotes/guides/vm/cms-6.html

Right. It's possible that Shaun may be remembering the change from
1.4.2 to 5.0 when the 68% -> 92% change in ceiling occured as a result of
CMSTriggerRatio going from 20(%) in 1.4.2 to 80(%) in 5.0.

-- ramki
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