G1 PermGen Usage for JAVA 7

[Poonam Bajaj Parhar]

Hello Sushant,

If we run with -XX:+PrintGCDetails option, it shows the GC algorithm 
used for all the generations.

D:\Java\jdk1.7.0_40\bin>java.exe -XX:+UseG1GC -XX:+PrintGCDetails -version
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) Client VM (build 24.0-b56, mixed mode)
Heap
  garbage-first heap   total 16384K, used 0K [0x04d00000, 0x05d00000, 0x14d00000)
   region size 1024K, 1 young (1024K), 0 survivors (0K)
  compacting perm gen  total 12288K, used 1354K [0x14d00000, 0x15900000, 0x18d00000)
    the space 12288K,  11% used [0x14d00000, 0x14e52a88, 0x14e52c00, 0x15900000)
No shared spaces configured.

Here we can see that PermGen is out of G1 heap, and G1GC algorithm is 
not used for the Permanent generation.

Thanks,
Poonam

On 9/3/2015 7:26 AM, susantra m wrote:
>
> Hello Everyone,
> I have a question related to how G1 handles permgen till JAVA7 .
> Basically till JAVA7 ,permgen was part of the JAVA heap , so as the 
> heap is divided into regions in G1 where exactly is permgen is stored  
> and how G1 manages that .
>
> It seems G1 divides  heap into regions , so if i have 2GB of Heap 
> which is divided into regions , i would assume Permgen to be part of 
> the regions till i am using  JDK7 .  With metaspace it is clear cut 
> that  it is outside of heap .
>
> Though i am assuming  it is maintaining permgen outside of  the heap 
> and they are not part of the regions ,  need some more info on this .
>
> Need some more clarification on this  and Appreciate any help and 
> suggestions.
>
>
> Thanks,
> Sushant.
>
>
> _______________________________________________
> hotspot-gc-use mailing list
> hotspot-gc-use at openjdk.java.net
> http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.openjdk.java.net/pipermail/hotspot-gc-use/attachments/20150903/ca873473/attachment.html>