G1gc compaction algorithm

[Martin Makundi]

Hmm.. ok, I copy pasted if from the mail, it works after typing manually,
thanks.

Problem seems to have been BOTH a whitespace typo AND
UnlockDiagnosticOptions was on the right side.

Thanks.

Gathering logs now.

**
Martin


2014-08-01 1:01 GMT+03:00 Yu Zhang <yu.zhang at oracle.com>:

>  maybe some hidden text?
>
> Thanks,
> Jenny
>
> On 7/31/2014 2:52 PM, Martin Makundi wrote:
>
> Strange that it is in the property summary but doesn't allow setting it.
>
>
> 2014-08-01 0:39 GMT+03:00 Martin Makundi <
> martin.makundi at koodaripalvelut.com>:
>
>> Hi!
>>
>> UnlockDiagnosticVMOptions  is on (though later (on the right side) in
>> the command line). Jvm version is
>>
>>  java version "1.7.0_55"
>> Java(TM) SE Runtime Environment (build 1.7.0_55-b13)
>> Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode)
>>
>>
>>
>> 2014-08-01 0:37 GMT+03:00 Yu Zhang <yu.zhang at oracle.com>:
>>
>>  Martin,
>>>
>>> These 2 need to run with  -XX:+UnlockDiagnosticVMOptions
>>>
>>> Thanks,
>>> Jenny
>>>
>>>  On 7/31/2014 2:33 PM, Martin Makundi wrote:
>>>
>>> Hi!
>>>
>>>  G1SummarizeRSetStats does not seem to work, jvm says:
>>>
>>>  Improperly specified VM option 'G1SummarizeRSetStatsPeriod=10'
>>> Error: Could not create the Java Virtual Machine.
>>> Error: A fatal exception has occurred. Program will exit.
>>>
>>>  Same for both new options
>>>
>>>
>>>
>>> 2014-07-31 20:22 GMT+03:00 Yu Zhang <yu.zhang at oracle.com>:
>>>
>>>> Martin,
>>>>
>>>> The ScanRS for mixed gc is extremely long, 1000-9000ms.  Because it is
>>>> over pause time goal, minimum old regions can be added to CSet.  So mixed
>>>> gc is not keeping up.
>>>>
>>>> Can do a run keeping 16m region size,  no G1PrintRegionLivenessInfo, no
>>>> PrintHeapAtGC.  But -XX:+G1SummarizeRSetStats
>>>> -XX:G1SummarizeRSetStatsPeriod=10
>>>>
>>>> This should tell us more about RSet information.
>>>>
>>>> While the UpdateRS is not as bad as ScanRS, we can try to push it to
>>>> the concurrent threads.  Can you add -XX:G1RSetUpdatingPauseTimePercent=5.
>>>>  I am hoping this brings the UpdateRS down to 50ms.
>>>>
>>>>
>>>> Thanks,
>>>> Jenny
>>>>
>>>> On 7/28/2014 8:27 PM, Martin Makundi wrote:
>>>>
>>>>> Hi!
>>>>>
>>>>> We suffered a couple of Full GC's using regionsize 5M (it seems to be
>>>>> exact looking at logged actual parameters) and we tried the 16M option and
>>>>> this resulted in more severe Full GC behavior.
>>>>>
>>>>> Here is the promised log for 16 M setting:
>>>>> http://81.22.250.165/log/gc-16m.log
>>>>>
>>>>> We switch back to 5M hoping it will behave more nicely.
>>>>>
>>>>> **
>>>>> Martin
>>>>>
>>>>
>>>>
>>>
>>>
>>
>
>
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