Avoiding the Young Generation Guarantee

Alex Aisinzon aaisinzon at guidewire.com
Mon Mar 10 19:34:14 UTC 2008


Doug

 

I thank you for your feedback.

I use the ParNewGC, which according to Jon's blog
(http://blogs.sun.com/jonthecollector/
<http://blogs.sun.com/jonthecollector/> ) is the combination of "ParNew"
+ "Serial Old".

Therefore, I do not use the UseConcMarkSweepGC.

I am using JDK 1.5.0_14.

 

I would not expect the young generation to be applied. The logs seem to
indicate that it is.

 

Alex A

 

________________________________

From: Jones, Doug H [mailto:doug.jones at eds.com] 
Sent: Monday, March 10, 2008 12:15 PM
To: Alex Aisinzon
Subject: RE: Avoiding the Young Generation Guarantee

 

Hi Alex,

 

It is not supposed to be the case under JVM version 5.0 on, it
definitely was under JVM 1.4.2. I'm assuming you are using
ConcMarkSweepGC of the tenured area.

 

Doug. 

	 

	
________________________________


	From: hotspot-gc-use-bounces at openjdk.java.net
[mailto:hotspot-gc-use-bounces at openjdk.java.net] On Behalf Of Alex
Aisinzon
	Sent: Tuesday, 11 March 2008 7:50 a.m.
	To: hotspot-gc-use at openjdk.java.net
	Subject: Avoiding the Young Generation Guarantee

	All

	 

	Our application scales very well when more memory is allocated
to it.

	The Young Generation Guarantee limits that scalability as it
forces Full GC while plenty of space is still available in the tenured
space.

	That guarantee forces us to use relatively smaller nurseries.

	
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html#0.0.0.0.%20Young
%20Generation%20Guarantee%7Coutline infers that this guarantee only
applies to the serial collector but I see it too with the parallel new
collector.

	Maybe I am confused in the collector terminology.

	Could someone tell me how I can disable the young generation
guarantee?

	 

	Thanks in advance

	 

	Alex A

	 

	I have enclosed a snippet of the GC logs for analysis purposes.

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