RFR (XXS): JDK-8059452: G1: Change the default values for G1HeapWastePercent and G1MixedGCLiveThresholdPercent

[Bengt Rutisson]

Thanks for the reviews Thomas and Jesper!

Bengt


On 2014-09-30 12:22, Jesper Wilhelmsson wrote:
> Ship it!
> /Jesper
>
> Thomas Schatzl skrev 30/9/14 12:02:
>> On Tue, 2014-09-30 at 10:02 +0200, Bengt Rutisson wrote:
>>> Hi everyone,
>>>
>>> Can I have a couple of reviews for this small change to update two
>>> default values:
>>>
>>> http://cr.openjdk.java.net/~brutisso/8059452/webrev.00/
>>>
>>> https://bugs.openjdk.java.net/browse/JDK-8059452
>>>
>>>   From the bug report:
>>>
>>> When the flags G1HeapWastePercent and G1MixedGCLiveThresholdPercent 
>>> were
>>> introduced their default values were picked without much performance
>>> analysis.
>>>
>>> Recent performance runs indicate that G1HeapWastePercent often benefit
>>> from a lower value and that G1MixedGCLiveThresholdPercent benefit 
>>> from a
>>> higher value.
>>>
>>> Suggestion is to change the default for G1HeapWastePercent to 5 
>>> (used to
>>> be 10) adn G1MixedGCLiveThresholdPercent to 85 (used to be 65).
>>
>> Fine with me.
>>
>> Thanks,
>>    Thomas
>>
>>