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Posted to dev@lucene.apache.org by Uwe Schindler <us...@apache.org> on 2013/04/02 21:16:58 UTC
RE: hsx/hotspot-gc/hotspot: 8009536: G1: Apache Lucene hang during reference processing
Hi John,
today I installed JDK8 b83 on one of the Jenkins build servers used by Apache Lucene: The problem with 32 bit JVMs and G1 collector is solved. I compared the trunk checkout of Lucene with both JVMs: In b82 it hangs, in b83 it passes. So I was able to re-enable 32 bit builds without the extra workaround stacksize option again.
Thanks for fixing this issue.
Uwe
-----
Uwe Schindler
uschindler@apache.org
Apache Lucene PMC Member / Committer
Bremen, Germany
http://lucene.apache.org/
> -----Original Message-----
> From: hotspot-gc-dev-bounces@openjdk.java.net [mailto:hotspot-gc-dev-
> bounces@openjdk.java.net] On Behalf Of john.cuthbertson@oracle.com
> Sent: Tuesday, March 19, 2013 2:21 AM
> To: hotspot-gc-dev@openjdk.java.net
> Subject: hg: hsx/hotspot-gc/hotspot: 8009536: G1: Apache Lucene hang
> during reference processing
>
> Changeset: fa08949fe0cb
> Author: johnc
> Date: 2013-03-18 11:05 -0700
> URL: http://hg.openjdk.java.net/hsx/hotspot-
> gc/hotspot/rev/fa08949fe0cb
>
> 8009536: G1: Apache Lucene hang during reference processing
> Summary: In CMTask::do_marking_step(), Skip offering termination and
> entering the first and second synchronization barriers if called from a serial
> context, i.e. the VM thread.
> Reviewed-by: brutisso, tschatzl
>
> ! src/share/vm/gc_implementation/g1/concurrentMark.cpp
> ! src/share/vm/gc_implementation/g1/concurrentMark.hpp
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Re: hsx/hotspot-gc/hotspot: 8009536: G1: Apache Lucene hang during
reference processing
Posted by John Cuthbertson <jo...@oracle.com>.
Hi Uwe,
Thanks for the update. That is good to know. The bulk of the credit goes
to Bengt who did the initial diagnosis and the prototype fix.
Thanks also for walking me through how to reproduce the issue. Once the
magic formula for the proxy was found - your instructions were spot on.
The tests were awesome as marking stress tests and uncovered several
issues associated with concurrent marking overflows. I've added them to
the set of tests I run for marking changes. :)
Cheers,
JohnC
On 4/2/2013 12:16 PM, Uwe Schindler wrote:
> Hi John,
>
> today I installed JDK8 b83 on one of the Jenkins build servers used by Apache Lucene: The problem with 32 bit JVMs and G1 collector is solved. I compared the trunk checkout of Lucene with both JVMs: In b82 it hangs, in b83 it passes. So I was able to re-enable 32 bit builds without the extra workaround stacksize option again.
>
> Thanks for fixing this issue.
>
> Uwe
>
> -----
> Uwe Schindler
> uschindler@apache.org
> Apache Lucene PMC Member / Committer
> Bremen, Germany
> http://lucene.apache.org/
>
>> -----Original Message-----
>> From: hotspot-gc-dev-bounces@openjdk.java.net [mailto:hotspot-gc-dev-
>> bounces@openjdk.java.net] On Behalf Of john.cuthbertson@oracle.com
>> Sent: Tuesday, March 19, 2013 2:21 AM
>> To: hotspot-gc-dev@openjdk.java.net
>> Subject: hg: hsx/hotspot-gc/hotspot: 8009536: G1: Apache Lucene hang
>> during reference processing
>>
>> Changeset: fa08949fe0cb
>> Author: johnc
>> Date: 2013-03-18 11:05 -0700
>> URL: http://hg.openjdk.java.net/hsx/hotspot-
>> gc/hotspot/rev/fa08949fe0cb
>>
>> 8009536: G1: Apache Lucene hang during reference processing
>> Summary: In CMTask::do_marking_step(), Skip offering termination and
>> entering the first and second synchronization barriers if called from a serial
>> context, i.e. the VM thread.
>> Reviewed-by: brutisso, tschatzl
>>
>> ! src/share/vm/gc_implementation/g1/concurrentMark.cpp
>> ! src/share/vm/gc_implementation/g1/concurrentMark.hpp
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