Please review fix for 7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size

[Jon Masamitsu]

Coleen,

Could you just enforce this with code instead of an assertion?
I don't want to see that assertion in tomorrow's nightlies :-)

*+     assert(class_word_size<  ClassMetaspaceSize/2, "should be no more then half class metaspace size");*

class_word_size = 
MIN2(**size_t)SpaceManager::MediumChunk*5,****ClassMetaspaceSize/2**)

ClassMetaspaceSize is used to reserve space?  I see that it's not used
for the initial Metaspace size.

Otherwise, looks good.

Jon

On 9/7/2012 6:33 AM, Coleen Phillimore wrote:
>
> Please reload.  I incorporated some suggestions and corrections from 
> stefank and did some tuning of the class metaspace size.
>
> Thanks,
> Coleen
>
> On 9/7/2012 7:22 AM, Coleen Phillimore wrote:
>> Summary: Don't allocate huge class metaspace size by default on x64
>>
>> This was preventing other mmap regions from being initialized on 
>> windows 64.  I also added some checking around the ClassMetaspaceSize 
>> option.  1*M seems to be minimal for startup size
>>
>> open webrev at http://cr.openjdk.java.net/~coleenp/7196103/
>>
>> Thanks,
>> Coleen
>>
>>