<div dir="ltr">We're just running with the default IHOP</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Mar 2, 2015 at 10:15 AM, Simone Bordet <span dir="ltr"><<a href="mailto:simone.bordet@gmail.com" target="_blank">simone.bordet@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<span class=""><br>
On Mon, Mar 2, 2015 at 6:44 PM, Christopher Berner<br>
<<a href="mailto:christopherberner@gmail.com">christopherberner@gmail.com</a>> wrote:<br>
> Hello,<br>
><br>
> I work on the Presto project (<a href="https://github.com/facebook/presto" target="_blank">https://github.com/facebook/presto</a>) and am<br>
> trying to understand the behavior of G1. We run a 45GB heap on the worker<br>
> machines with "-XX:G1HeapRegionSize=32M", and it works smoothly,<br>
<br>
</span>Just out of curiosity, you seem to have IHOP=45% and an eden that is<br>
55% of the heap (25 GiB out of 45 GiB).<br>
Is there any reason why you keep IHOP this low or you're just running<br>
with defaults ?<br>
<br>
To the hotspot gc experts, is there any way to limit the Eden size<br>
without impacting on the ergonomics ?<br>
Does -XX:MaxNewSize impact ergonomics ?<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Simone Bordet<br>
<a href="http://bordet.blogspot.com" target="_blank">http://bordet.blogspot.com</a><br>
---<br>
Finally, no matter how good the architecture and design are,<br>
to deliver bug-free software with optimal performance and reliability,<br>
the implementation technique must be flawless.  Victoria Livschitz<br>
</font></span></blockquote></div><br></div>