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

[Jon Masamitsu]

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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