G1 is bad for me

[Y. Srinivas Ramakrishna]

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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