G1 is bad for me

[Y. Srinivas Ramakrishna]

Sorry, we haven't responded in depth because we are busy with other
high priority stuff. Please follow up with your support
contacts for urgent issues.

If you subscribe to hotspot-gc-dev at openjdk.java.net you will
get all G1 integration notifications; those then usually flow into
the next JDK7 build in the subsequent week or two.

regards.
-- ramki

Andrei Pozolotin wrote:
>     Tony, Ramki, Jon, hello;
> 
>     1) I take it that you silence means that "we are not there yet" with G1;
>     understandable - thank you for your efforts!
> 
>     2) there are some 82 people on this mail list who seem to be really
>     interested
>     in GC and G1 specifically; can I ask to you to make brief
>     announcements here
>     when JDK 7 weekly build brings some new G1 advances, so we can test
>     it right away?
> 
>     Thank you;
> 
>     Andrei
> 
> 
> -------- Original Message  --------
> Subject: Re: G1 is bad for me
> From: Y. Srinivas Ramakrishna <Y.S.Ramakrishna at Sun.COM>
> To: Andrei Pozolotin <andrei.pozolotin at gmail.com>
> Cc: hotspot-gc-use at openjdk.java.net
> Date: Thu 18 Feb 2010 11:37:56 AM CST
>> Hi Andrei -- please use the latest hs17 JVM which you can get from JDK
>> 7. There have been
>> many improvements (and bug fixes) since the 6u18/hs16 that you are
>> using below.
>> Most importantly, please add -XX:-ReduceInitialCardMarks to work
>> around a regression
>> introduced in 6u18/hs16, as described in the 6u18 release notes.
>> As re optimal settings (these may be quite different from shapes that
>> helped with CMS
>> for example), i'll let others w/more (tuning and other) experience
>> w/G1 comment.
>>
>> -- ramki
>>
>> On 02/18/10 08:56, Andrei Pozolotin wrote:
>>>     Ramki, Jon, hi;
>>>
>>>     I read everyting I could find on G1:
>>>     http://www.google.com/patents/about?id=j5SpAAAAEBAJ&dq=7,340,494
>>>    
>>> http://developers.sun.com/learning/javaoneonline/2008/pdf/TS-5419.pdf
>>>     http://research.sun.com/jtech/pubs/04-g1-paper-ismm.pdf
>>>     http://blogs.sun.com/sunabl/entry/the_new_g1_collector
>>>     http://blogs.sun.com/jonthecollector/entry/our_collectors
>>>     etc, etc, etc,
>>>
>>>     got myself excited - looks great on paper!
>>>
>>>     and I followed Albert's advice, while trying to mimic my CMS
>>> settings:
>>>     http://blogs.sun.com/sunabl/entry/the_new_g1_collector
>>>
>>>     -Xms3700m
>>>     -Xmx3700m
>>>     -XX:PermSize=50m
>>>     -XX:MaxPermSize=50m
>>>     -XX:+UnlockExperimentalVMOptions
>>>     -XX:+UseG1GC
>>>     -XX:G1YoungGenSize=900m
>>>     -XX:SurvivorRatio=2
>>>     -XX:+G1ParallelRSetUpdatingEnabled
>>>     -XX:+G1ParallelRSetScanningEnabled
>>>
>>>     results:
>>>
>>>     1) pauses are 1000 milliseconds or more;
>>>
>>>     2) reproducible crashes after 3 minutes under load;
>>>
>>>     logs attached;
>>>
>>>     am I missing something obvious?
>>>     like do I need to switch to older / specific JVM build?
>>>
>>>     per Tony, this was already working fine for a neighbour of mine
>>> in 2008:
>>>    
>>> http://developers.sun.com/learning/javaoneonline/2008/pdf/TS-5419.pdf
>>>
>>>     Thank you;
>>>
>>>     Andrei
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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>>
> 
>