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List:       openjdk-hotspot-gc-use
Subject:    RE: G1 GC  Humongous Objects -  Garbage collection
From:       "Gopal, Prasanna CWK" <prasanna.gopal () blackrock ! com>
Date:       2016-10-25 9:53:34
Message-ID: 17856615e3ec4df3a0559a7ab31122e8 () UKPMSEXD202N02 ! na ! blkint ! com
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Hi Thomas 

Thanks for your explanation. Appreciate your help.

Thanks and Regards
Prasanna 

-----Original Message-----
From: Thomas Schatzl [mailto:thomas.schatzl@oracle.com] 
Sent: 25 October 2016 10:24
To: Gopal, Prasanna CWK <prasanna.gopal@blackrock.com>; \
                hotspot-gc-use@openjdk.java.net
Subject: Re: G1 GC Humongous Objects - Garbage collection

Hi,

On Tue, 2016-10-25 at 08:41 +0000, Gopal, Prasanna CWK wrote:
> Hi All
> 
> I have the following question about Garbage collection of  Humongous 
> objects.
> 
> 1)     When will the humongous objects will get reclaimed ?
> 2)     Is there is any behaviour difference between Jdk 7 and Jdk 8 
> run time ?
> 3)     I understand, in pre-jdk 8 G1 GC , the humongous objects gets 
> collected only through Full GC. In my application , I couldn’t see 
> Full GC happening for long time (running on jdk_7u40_x64) , does this 
> means the humongous objects stay in memory , till we have a full GC ?

G1 can reclaim humongous objects...

* at the end of marking in the GC Cleanup pause.

* during full gc.

* JDK8u60+ can also reclaim particular types of humongous objects (arrays that do \
_not_ consist of references to objects) at every young GC. See the release notes for \
8u60 at www.oracle.com_technetwork" rel="nofollow">https://urldefense.proofpoint.com/v2/url?u=http-3A__www.oracle.com_technetwork> \
&d=DQIFaQ&c=zUO0BtkCe66yJvAZ4cAvZg&r=zRhnqN6xuCQh8NZ-MtoiYBMlItU6r8UBO9AjZ3c3DEY&m=5pQ \
kGSufUB_aL1XJUcW86zVuBn5xYh1XrUD5N2zcu1M&s=OKbYPqGNR3NGiLzOFh6tXk2cXLnbhFxrp8H4Svff20A&e=
                
/java/javase/8u60-relnotes-2620227.html under "New Features and Changes" for how to \
control this. (It works for any array of primitive type, not limited to the examples \
given there - just in case you wonder).

Thanks,
  Thomas



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