Sundar,
Initial mark is a young gc piggy backed with some initial marking
activities.
"Initial Mark : This type of collection starts the marking process in
addition to performing a regular young-only collection. Concurrent
marking determines all currently reachable (live) objects in the old
generation regions to be kept for the following space-reclamation phase.
While marking hasn’t completely finished, regular young collections may
occur. Marking finishes with two special stop-the-world pauses: Remark
and Cleanup."
From
http://docs.oracle.com/javase/9/gctuning/garbage-first-garbage-collector.htm#JSGCT-GUID-1CDEB6B6-9463-4998-815D-05E095BFBD0F
Thanks
Jenny
On 7/19/2017 11:03 AM, Sundara Mohan M wrote:
Jenny,
Thanks for the update.
Another question i was looking at the source and saw this,
enum G1YCType {
Normal,
InitialMark,
DuringMark,
Mixed,
G1YCTypeEndSentinel
};
Any idea why InitialMark are categorized as Young Collection, though
it is processing in Old Generation?
Also mixed can include old regions in which case it should be
categorized as Old Generation.
Just trying to understand if this is designed like this or this is
kind of bug?
Thanks,
Sundar
On Wed, Jul 19, 2017 at 8:24 AM, yu.zh...@oracle.com
<mailto:yu.zh...@oracle.com> <yu.zh...@oracle.com
<mailto:yu.zh...@oracle.com>> wrote:
Sundara,
I have filed this bug
https://bugs.openjdk.java.net/browse/JDK-8145923
<https://bugs.openjdk.java.net/browse/JDK-8145923>
But has not been fixed.
Jenny
On 07/18/2017 10:41 AM, Sundara Mohan M wrote:
Hi,
I am trying to capture all GC event happened on G1 Old Generation.
I was expecting when G1 Evacuation pause (mixed) happens it
should trigger event to my app but instead, i am getting
notification only when Full GC happens.
Here is what i am doing
gcMxBeanListener = myFunction(...)
oldGen = ManagementFactiory.getGarbageCollectorMXBeans find {
"G1 Old Generation" }
oldGen.addNotificationListener(gcMxBeanListener, null, null)
But in the case of CMS GC, it is triggered when the concurrent
cycle is completed.
Is there something i am missing?
Thanks,
Sundar
_______________________________________________
hotspot-gc-use mailing list
hotspot-gc-use@openjdk.java.net
<mailto:hotspot-gc-use@openjdk.java.net>
http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
<http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use>
_______________________________________________
hotspot-gc-use mailing list
hotspot-gc-use@openjdk.java.net
http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
