G1 "to-space exhausted" causes used heap space to increase?

[Christopher Berner]

Thanks! I'll try adjusting the pause target, and if that doesn't help I'll
try those other settings

On Mon, Mar 2, 2015 at 2:45 PM, Yu Zhang <yu.zhang at oracle.com> wrote:

>  I am starting a FAQ page, I added this question
> https://blogs.oracle.com/g1gc/
> 9. What is the recommended way to limit Eden size for g1?
>
>  The recommended way is to set  -XX:MaxGCPauseMillis.  G1 will adjust
> YoungGen size trying to meet the pause goal.  The Young gen size is between
> 5 to 60 percent of the heap size.  To control it further, you can use
> Experimental flags:
>
> -XX:+UnlockExperimentalVMOpt -XX:G1NewSizePercent=<5>
> -XX:G1MaxNewSizePercent=<60>.
>
>  G1 will pick up other settings, such as NewRatio, NewSize, MaxNewSize,
> -Xmn
>
> -Xmn: the same as NewSize=MaxNewSize
>
> only -XX:NewSize is set, the young gen size is between specified NewSize
> and  G1MaxNewSizePercent
>
> only -XX:MaxNewSize is set, the young gen size is between
> specified G1NewSizePercent and MaxNewSize.
>
> Both  -XX:NewSize and  -XX:MaxNewSize are used, young gen will be between
> those 2 sizes.  But when heap size change, the young gen size will not
> change accordingly.
>
> If  -XX:NewRatio is used, the Young Gen size is heap size * newRatio.
> NewRatio is ignored if it is used with NewSize and MaxNewSize.
>
> Thanks,
> Jenny
>
> On 3/2/2015 10:15 AM, Simone Bordet wrote:
>
> Hi,
>
> On Mon, Mar 2, 2015 at 6:44 PM, Christopher Berner<christopherberner at gmail.com> <christopherberner at gmail.com> wrote:
>
>  Hello,
>
> I work on the Presto project (https://github.com/facebook/presto) and am
> trying to understand the behavior of G1. We run a 45GB heap on the worker
> machines with "-XX:G1HeapRegionSize=32M", and it works smoothly,
>
>  Just out of curiosity, you seem to have IHOP=45% and an eden that is
> 55% of the heap (25 GiB out of 45 GiB).
> Is there any reason why you keep IHOP this low or you're just running
> with defaults ?
>
> To the hotspot gc experts, is there any way to limit the Eden size
> without impacting on the ergonomics ?
> Does -XX:MaxNewSize impact ergonomics ?
>
>
>
>
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