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 >
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