hotspot-gc-use Digest, Vol 46, Issue 9

[Guy Korland]

Yes, I'm familiar with this configuration for CMS.
Is there a similar configuration for G1?

Thanks,
Guy


On Thu, Dec 29, 2011 at 1:32 AM, Jon Masamitsu <jon.masamitsu at oracle.com>wrote:

>
>
> On 12/28/2011 1:17 PM, Guy Korland wrote:
>
>> Thanks for the answer, is there any chance you can also help with my other
>> question?
>> Is there a way with as with cms to control the "occupancy"?
>>
>
> If you mean the occupancy at which CMS starts  a collection, try
> -XX:**CMSInitiatingOccupancyFraction**=NN where NN is the
> percentage of the tenured generation at which a CMS collection
> will start.
>
> If you mean something else, please ask again.
>
>
>  Thanks,
>> Guy
>>
>>
>>  ---
>>> Date: Tue, 27 Dec 2011 14:06:53 -0800
>>> From: Jon Masamitsu<jon.masamitsu@**oracle.com<jon.masamitsu at oracle.com>
>>> >
>>> Subject: Re: Turning off generational GC
>>> To: hotspot-gc-use at openjdk.java.**net <hotspot-gc-use at openjdk.java.net>
>>> Message-ID:<4EFA417D.4070009@**oracle.com <4EFA417D.4070009 at oracle.com>>
>>> Content-Type: text/plain; charset="iso-8859-1"
>>>
>>> For the hotspot garbage collectors the short answer is "no" there is no
>>> way to
>>> turn off generational GC.  I think it's even pretty deeply entrenched in
>>> G1 which
>>> is only logically generational.
>>>
>>> If CMS were not generational, in the best cause you would see pauses
>>> on the order of 20ms.  Maybe much larger although less frequent.
>>> More likely would be concurrent mode failures which would lead to
>>> full GC's.
>>>
>>>
>>> On 12/27/2011 1:20 PM, Guy Korland wrote:
>>>
>>>> Hi,
>>>>
>>>> I hope this is the right forum for this.
>>>> It seems like no matter how small we set the young generation, it take
>>>>
>>> more
>>
>>> than 20ms.
>>>> Is there a way turn off generational GC, especially in CMS?
>>>>
>>>> Thanks,
>>>> Guy
>>>>
>>>>
>>>>
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