thanks Uwe!
2013/3/12 Robert Muir <rcm...@gmail.com> > Uwe: Thanks for working with them to get all these issues fixed. > > On Mon, Mar 11, 2013 at 7:34 PM, Uwe Schindler <u...@thetaphi.de> wrote: > > Hi, > > > > FYI, Oracle has a fix for the G1GC hang in UIMA waiting for review: > > > > Issue: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8009536 > > Webrev: > http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2013-March/006215.html > > Patch: http://cr.openjdk.java.net/~johnc/8009536/webrev.0/ > > > > Thanks to John Cuthbertson and Bengt Rutisson @ Oracle for fixing so > fast! We just have to wait for a new JDK8 build with that fix included (and > some more for the other Lucene-related bugs). > > Uwe > > > > ----- > > Uwe Schindler > > H.-H.-Meier-Allee 63, D-28213 Bremen > > http://www.thetaphi.de > > eMail: u...@thetaphi.de > > > > > >> -----Original Message----- > >> From: Mark Miller [mailto:markrmil...@gmail.com] > >> Sent: Wednesday, March 06, 2013 7:52 PM > >> To: dev@lucene.apache.org > >> Subject: Re: JVM hanging when using G1GC on JDK8 b78 or b79 (Linux 32 > bit) > >> > >> Awesome work Uwe! Nice job getting this some attention. > >> > >> - mark > >> > >> On Mar 6, 2013, at 10:41 AM, Uwe Schindler <u...@thetaphi.de> wrote: > >> > >> > It seems that there is already an explanation from the Oracle > engineer: > >> > > >> >> -----Original Message----- > >> >> From: John Cuthbertson [mailto:john.cuthbert...@oracle.com] > >> >> Sent: Wednesday, March 06, 2013 7:04 PM > >> >> To: Thomas Schatzl > >> >> Cc: Uwe Schindler; hotspot-gc-...@openjdk.java.net; 'David Holmes'; > >> >> 'Dawid Weiss'; hotspot-...@openjdk.java.net > >> >> Subject: Re: JVM hanging when using G1GC on JDK8 b78 or b79 (Linux 32 > >> >> bit) > >> >> > >> >> Hi Everyone, > >> >> > >> >> All: > >> >> I've looked at the bug report (haven't tried to reproduce it yet) and > >> >> Bengt's analysis is correct. The concurrent mark thread is entering > >> >> the synchronization protocol in a marking step call. That code is > >> >> waiting for some non-existent workers to terminate before proceeding. > >> >> Normally we shouldn't be entering that code but I think we overflowed > >> >> the global marking stack (I updated the CR at ~1am my time with that > >> >> conjecture). I think I missed a set_phase() call to tell the parallel > >> >> terminator that we only have one thread and it's picking up the > >> >> number of workers that executed the remark parallel task. > >> >> > >> >> Thomas: you were on the right track with your comment about the > >> >> marking stack size. > >> >> > >> >> David: > >> >> Thanks for helping out here. The stack trace you mentioned was for > >> >> one the refinement threads - a concurrent GC thread. When a > >> >> concurrent GC thread "joins" the suspendible thread set, it means > >> >> that it will observe and participate in safepoint operations, i.e. > >> >> the thread will notice that it should reach a safepoint and the > safepoint > >> synchronizer code will wait for it to block. > >> >> When we wish a concurrent GC thread to not observe safepoints, that > >> >> thread leaves the suspendible thread set. I think the name could be a > >> >> bit better and Tony, before he left, had a change that used a scoped > >> >> object to join and leave the STS that hasn't been integrated yet. > >> >> IIRC Tony wasn't happy with the name he chose for that also. > >> >> > >> >> Uwe: > >> >> Thanks for bringing this up and my apologies for not replying sooner. > >> >> I will have a fix fairly soon. If I'm correct about it being caused > >> >> by overflowing the marking stack you can work around the issue by > >> >> increasing the MarkStackSize.you could try increasing it to 2M or 4M > >> >> entries (which is the current max size). > >> >> > >> >> Cheers, > >> >> > >> >> JohnC > >> > > >> > ----- > >> > Uwe Schindler > >> > H.-H.-Meier-Allee 63, D-28213 Bremen > >> > http://www.thetaphi.de > >> > eMail: u...@thetaphi.de > >> > > >> > > >> >> -----Original Message----- > >> >> From: Uwe Schindler [mailto:u...@thetaphi.de] > >> >> Sent: Wednesday, March 06, 2013 1:35 PM > >> >> To: dev@lucene.apache.org > >> >> Subject: FW: JVM hanging when using G1GC on JDK8 b78 or b79 (Linux 32 > >> >> bit) > >> >> > >> >> They already understood the G1GC problem with JDK 8 b78/b79 and > >> >> working on a fix. This was really fast: > >> >> http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2013- > >> >> March/006128.html > >> >> > >> >> Uwe > >> >> > >> >> ----- > >> >> Uwe Schindler > >> >> H.-H.-Meier-Allee 63, D-28213 Bremen > >> >> http://www.thetaphi.de > >> >> eMail: u...@thetaphi.de > >> >> > >> > > >> > > >> > > >> > --------------------------------------------------------------------- > >> > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For > >> > additional commands, e-mail: dev-h...@lucene.apache.org > >> > > >> > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For > additional > >> commands, e-mail: dev-h...@lucene.apache.org > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org > > For additional commands, e-mail: dev-h...@lucene.apache.org > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org > For additional commands, e-mail: dev-h...@lucene.apache.org > >
