Question regarding G1 option to run parallel Old generation garbage collection?

[Kirk Pepperdine]

Not sure what the G1 would do with an initiating occupancy value of 0.

  size_t marking_initiating_used_threshold =
    (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent;

I didn't dig much deeper into the code to see how 0 was handled.

Regards,
Kirk

On 2012-10-19, at 7:13 AM, csewhiz <csewhiz at zoho.com> wrote:

> Hello All,
>   Sorry for posting this question in this mailing list. I am unable to find any answer for this. I am trying to tune our application for G1GC as we need very small pauses Below 500msec.
>   But the problem is when we are runing with G1GC (under jdk 6_u37)  Old generation of garbage collection only happening when it is reaching the Max GC size I noticed on jdk 6U 37 if max heap size is 1GB then it is close to 1sec 2GB close to 2 sec pauses.
>  
>   Is there any parameter to force the old gc happening regularly.
>  
> I am trying following setting,
>  
> -Xms1280M -Xmx1280M -XX:+UseG1GC -XX:MaxTenuringThreshold=15 -XX:SurvivorRatio=8 -XX:NewRatio=1 -XX:GCPauseIntervalMillis=7500 -XX:MaxGCPauseMillis=500 -XX:InitiatingHeapOccupancyPercent=0 -XX:ParallelGCThreads=7 -XX:ConcGCThreads=7
>  
> If anyone can give insight on how full GC is triggred internals will be of great help.
>  
> PS: I have tried without any option for G1 but not of much help hence .. this one trying to be agressive ? but of not much help.
>  
>  
> Regards,
> Soumit
> 

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