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

[Guy Korland]

Thanks, I'll test it. Is there also something similar to -
UseCMSInitiatingOccupancyOnly ?

Thanks,
Guy



On Thu, Dec 29, 2011 at 4:28 PM, Jon Masamitsu <jon.masamitsu at oracle.com>wrote:

> This is close to the CMS flag but is a percent of
> the entire heap (as opposed to the tenured
> generation for CMS).
>
> -XX:InitiatingHeapOccupancyPercent=NN
>
>
> On 12/29/11 01:45, Guy Korland wrote:
>
>  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 at oracle.com>
>>>> Subject: Re: Turning off generational GC
>>>> To: hotspot-gc-use at openjdk.java.net
>>>> Message-ID:<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
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> hotspot-gc-use mailing list
>>>>> hotspot-gc-use at openjdk.java.net
>>>>> http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
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>>>> End of hotspot-gc-use Digest, Vol 46, Issue 9
>>>> *********************************************
>>>>
>>>>
>
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