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

[Simone Bordet]

Hi,

On Mon, Mar 2, 2015 at 6:44 PM, Christopher Berner
<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 ?

-- 
Simone Bordet
http://bordet.blogspot.com
---
Finally, no matter how good the architecture and design are,
to deliver bug-free software with optimal performance and reliability,
the implementation technique must be flawless.   Victoria Livschitz