JDK-8166500 Adaptive sizing for IHOP causes excessively long mixed GC pauses

[Ildar Nurislamov]

Hi Thomas,

Thank you for really helpful advices.

I have performed 8-hour testing with:
-XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=2 -XX:G1HeapWastePercent=10 -XX:G1MixedGCCountTarget=12 
and they improved situation for both 8u and 9ea.
Longest pause on 9ea now is 400ms with Adaptive sizing for IHOP

I will continue testing and report if anything interesting pops out.

--
Ildar Nurislamov
GetIntent, AdServer Team Leader

> On Sep 28, 2016, at 10:37, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi Ildar,
> 
> On Fri, 2016-09-23 at 12:40 +0300, Ildar Nurislamov wrote:
>> Hi Thomas Schatzl!
>> 
>> Thank you for such prompt responses. 
>> I'm going to try you advices and send results next week.
>> 
>> Here are log files you have asked about:
>> https://www.dropbox.com/s/i9o4nuuh5gpsf1y/9noaihop_07_09_16.log.zip?d
>> l=0
>> https://www.dropbox.com/s/xa3cfezvlqwwh6v/8u_log_07_09_16.log.zip?dl=
>> 0
>>  
> 
>   thanks a lot for the logs. As you may have noticed I closed JDK-
> 8166500 as duplicate of the existing JDK-8159697 issue. They are the
> same after all.
> We will continue working on improving out-of-box experience of G1. :)
> 
> As hypothesized in the text for JDK-8166500, the 8u and 9-without-aihop 
> show the same general issue. The suggested tunings should improve mixed
> gc times for now.
> 
> Thanks,
>   Thomas
> 

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