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This is close to the CMS flag but is a percent of<br>
the entire heap (as opposed to the tenured<br>
generation for CMS).<br>
<br>
-XX:InitiatingHeapOccupancyPercent=NN<br>
<br>
On 12/29/11 01:45, Guy Korland wrote:
<blockquote
cite="mid:CAMaz81+pojYagb-=VN8TWroZwRvCMJ7kw0NW75GqzbL6-EDrQA@mail.gmail.com"
type="cite">
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<div>Yes, I'm familiar with this configuration for CMS.</div>
Is there a similar configuration for G1?
<div><br>
</div>
<div>Thanks,</div>
<div>Guy<br>
<br>
<br>
<div class="gmail_quote">On Thu, Dec 29, 2011 at 1:32 AM, Jon
Masamitsu <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:jon.masamitsu@oracle.com">jon.masamitsu@oracle.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im"><br>
<br>
On 12/28/2011 1:17 PM, Guy Korland wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks for the answer, is there any chance you can
also help with my other<br>
question?<br>
Is there a way with as with cms to control the
"occupancy"?<br>
</blockquote>
<br>
</div>
If you mean the occupancy at which CMS starts a
collection, try<br>
-XX:CMSInitiatingOccupancyFraction=NN where NN is the<br>
percentage of the tenured generation at which a CMS
collection<br>
will start.<br>
<br>
If you mean something else, please ask again.
<div class="HOEnZb">
<div class="h5"><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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Thanks,<br>
Guy<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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---<br>
Date: Tue, 27 Dec 2011 14:06:53 -0800<br>
From: Jon Masamitsu<<a moz-do-not-send="true"
href="mailto:jon.masamitsu@oracle.com"
target="_blank">jon.masamitsu@oracle.com</a>><br>
Subject: Re: Turning off generational GC<br>
To: <a moz-do-not-send="true"
href="mailto:hotspot-gc-use@openjdk.java.net"
target="_blank">hotspot-gc-use@openjdk.java.net</a><br>
Message-ID:<<a moz-do-not-send="true"
href="mailto:4EFA417D.4070009@oracle.com"
target="_blank">4EFA417D.4070009@oracle.com</a>><br>
Content-Type: text/plain; charset="iso-8859-1"<br>
<br>
For the hotspot garbage collectors the short
answer is "no" there is no<br>
way to<br>
turn off generational GC. I think it's even
pretty deeply entrenched in<br>
G1 which<br>
is only logically generational.<br>
<br>
If CMS were not generational, in the best cause
you would see pauses<br>
on the order of 20ms. Maybe much larger although
less frequent.<br>
More likely would be concurrent mode failures
which would lead to<br>
full GC's.<br>
<br>
<br>
On 12/27/2011 1:20 PM, Guy Korland wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
Hi,<br>
<br>
I hope this is the right forum for this.<br>
It seems like no matter how small we set the
young generation, it take<br>
</blockquote>
</blockquote>
more<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
than 20ms.<br>
Is there a way turn off generational GC,
especially in CMS?<br>
<br>
Thanks,<br>
Guy<br>
<br>
<br>
<br>
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