> -----Original Message----- > From: Charles Richard [mailto:charle...@thelearningbar.com] > Sent: Thursday, May 09, 2013 7:03 AM > To: Tomcat Users List > Subject: Re: Tomcat thread dump analysis > > On Wed, May 8, 2013 at 6:16 PM, Christopher Schultz < > ch...@christopherschultz.net> wrote: > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA256 > > > > Charles, > > > > On 5/8/13 1:57 PM, Charles Richard wrote: > > > I appreciate the friendly feedback! How do I show a lock? I don't > > > see any threads that have a "BLOCKED" status. I do get this when I > > > do a grep: > > > > > > [root@web01 stacks]# grep locked tomcat1_20130507_14\:38.stack | wc > > > -l 154 > > > > > > My connection pool is 150 and I do see 150 locks in the following > > > type scenario which has a "locked": > > > > > > "TP-Processor416" daemon prio=10 tid=0x00002aff2939a800 nid=0x5ae7 > > > in Object.wait() [0x00002aff632ae000] java.lang.Thread.State: > > > WAITING (on object monitor) at java.lang.Object.wait(Native > > > Method) - waiting on <0x00002afe240fbc58> (a > > > com.mchange.v2.resourcepool.BasicResourcePool) > > > > This only tells you the identity of the object monitor (the "lock"). > > What you are missing is the identities of the object monitors already > > held by this and other threads. I believe your thread dump does not > > include any of these. > > > > IIRC, the Oracle JVM can (when prodded) produce a thread dump which > > includes deadlock detection and will show the suspected-deadlocked > > threads, the held lock ids and what threads are waiting on. > > > > Perhaps you can get a "better" thread dump via other means? How did > > you get the one you have now? > > > > - -chris > > > > I got the current dump by using jstack which is in my 1.6.0_22 jdk > binaries. How should i produce this stack? What would a dump showing a > suspected-deadlocked threads look like? > > Thanks! > > Cheers, > Charles
I find jconsole infinitely useful for tracing deadlocks. It's also available in the jdk binaries. And the tomcat docs have setup instructions. Jeff --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
