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From Kirk Pepperdine <>
Subject Re: Eden size
Date Mon, 18 Aug 2014 12:07:12 GMT
Hi Paul,

I would suggest that a good study of how GC performs for your load test is in order. I’d
start by setting the following flags

Also, remove the setting for NewSize. In fact I always start any GC tuning exercise by only
setting max heap size and nothing else except turning up the tenuring threshold to 15.

I have tooling to look at the output but it’s commercial but if you send me the GC log I’ll
perform a quick analysis for you.

Kind regards,
Kirk Pepperdine

On Aug 18, 2014, at 1:54 PM, wrote:

> Hi, 
> I am running a 64-bit JVM on a LInux machine with 15GB of RAM. 
> I have increased the Java heap space size by 16x
> HEAP="-Xms8192m -Xmx8192m"
> I have a feeling that I should be increasing the eden space by a
> proportionate amount:
> NEW="-XX:NewSize=2048m -XX:MaxNewSize=2048m"
> However, the comment above the eden setting states:
> "you'll need to tune this down proportionally if you modify the HEAP
> values above" 
> Which I find confusing. 
> Many Thanks
> Paul
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