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

[Jon Masamitsu]

Not certain but I don't think there is an equivalent.

On 12/30/2011 7:32 AM, Guy Korland wrote:
> 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
>>>>>>
>>>>>>
>>>>>>
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>>>>> End of hotspot-gc-use Digest, Vol 46, Issue 9
>>>>> *********************************************
>>>>>
>>>>>
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