Hi, Saw your message on the boards.
Did you make sure you have this environment variable set? On systems that I need it, I put it in my tomcat startup file. LD_KERNEL_ASSUME="2.2.5" Check out my howto page for my brief notes on threading and it's potential problems with JVMs and threads. http://www.linuxjava.net/howto/webapp/ Oscar On Tue, 17 Feb 2004, Daniel Gibby wrote: > My tomcat 4.1.29 instance running J2RE 1.4.1 IBM build > cxia321411-20030930 on RedHat 9 kernel 2.4.18-14 > keeps gaining processor usage until finally can't answer requests > successfully. > > The machine has a relatively light load. > > I did a kill -3 on the process that showed up on top and got a stack > trace... the problem is I have no idea how to analyze the thread dump to > see what is consuming CPU. > I'm sure something must be spinning its wheels, but I don't know how to > tell... I can just see that when I run top my tomcat process has 99.9 % > of the CPU and the load average is 8.00 8.00 8.00 > > I've fixed problems in the past on a separate java application (not > tomcat) where I can tell what the problem is in the thread dump because > a thread waiting to be notified is also the one that has a lock on it to > notify the thing that is waiting to notify it... (that didn't make > sense, I know... but anyway it is basically a circle where it won't ever > get woken up.) > However, in this tomcat case, I can't see anything like that where > something is waiting in circles... even though I wouldn't rule that out. > My experience on reading thread dumps is limited... Anyway, can someone > who has better experience tell me what is consuming the CPU? Restarting > tomcat brings the load back down, and it slowly goes up again... like > over a few days to a weeks time it is back up to 8.00 Load Average. > > I won't include the whole file. I trimmed the file down to 1350 lines by > getting rid of a lot of 2HPMEMMAPLINE lines and the section titled: > 0SECTION CL subcomponent dump routine > but I think that is still too long to post here. > > I'm hoping that someone can tell me what to include and what to exclude > and I'll reply with the appropriate parts of the dump. > > Thanks, > Daniel > > NULL > ------------------------------------------------------------------------ > 0SECTION TITLE subcomponent dump routine > NULL =============================== > 1TISIGINFO signal 3 received > 1TIDATETIME Date: 2004/02/17 at 08:53:22 > 1TIFILENAME Javacore filename: /tmp/javacore.20040217.085322.23429.txt > NULL > ------------------------------------------------------------------------ > 0SECTION XHPI subcomponent dump routine > NULL ============================== > 1HPTIME Tue Feb 17 08:53:22 2004 > 1HPSIGRECV SIGQUIT received in ?? at (nil) in ??. > 1HPFULLVERSION J2RE 1.4.1 IBM build cxia321411-20030930 > NULL > 1HPOPENV Operating Environment > NULL --------------------- > 2HPHOSTNAME Host : somehost.com.(none) > 2HPOSLEVEL OS Level : 2.4.18-14.#1 Wed Sep 4 13:35:50 EDT 2002 > 2HPLIBCVER glibc Version : 2.2.93 > 2HPCPUS Processors - > 3HPARCH Architecture : (not implemented) > 3HPNUMCPUS How Many : (not implemented) > 3HPCPUSENABLED Enabled : 1 > NULL > 1HPMEMINFO Memory Info > NULL ----------- > 2HPMEMLINE total: used: free: shared: buffers: cached: > 2HPMEMLINE Mem: 1055625216 1015181312 40443904 0 83464192 > 614227968 > 2HPMEMLINE Swap: 1052827648 929792 1051897856 > 2HPMEMLINE MemTotal: 1030884 kB > 2HPMEMLINE MemFree: 39496 kB > 2HPMEMLINE MemShared: 0 kB > 2HPMEMLINE Buffers: 81508 kB > 2HPMEMLINE Cached: 599596 kB > 2HPMEMLINE SwapCached: 236 kB > 2HPMEMLINE Active: 552968 kB > 2HPMEMLINE Inact_dirty: 344020 kB > 2HPMEMLINE Inact_clean: 50304 kB > 2HPMEMLINE Inact_target: 189456 kB > 2HPMEMLINE HighTotal: 130880 kB > 2HPMEMLINE HighFree: 1024 kB > 2HPMEMLINE LowTotal: 900004 kB > 2HPMEMLINE LowFree: 38472 kB > 2HPMEMLINE SwapTotal: 1028152 kB > 2HPMEMLINE SwapFree: 1027244 kB > 2HPMEMLINE Committed_AS: 1067972 kB > NULL > 1HPUSERLIMITS User Limits (in bytes except for NOFILE and NPROC) - > NULL ----------- > 2HPUSERLIMIT RLIMIT_FSIZE : infinity > 2HPUSERLIMIT RLIMIT_DATA : infinity > 2HPUSERLIMIT RLIMIT_STACK : 2093056 > 2HPUSERLIMIT RLIMIT_CORE : 0 > 2HPUSERLIMIT RLIMIT_NOFILE : 1024 > 2HPUSERLIMIT RLIMIT_NPROC : 7168 > NULL > 1HPSIGHANDLERS JVM Signal Handlers > NULL ------------------- > 2HPSIGHANDLER HUP : unknown handler > 2HPSIGHANDLER INT : unknown handler > 2HPSIGHANDLER QUIT : unknown handler > 2HPSIGHANDLER ILL : unknown handler > 2HPSIGHANDLER TRAP : unknown handler > 2HPSIGHANDLER ABRT : unknown handler > 2HPSIGHANDLER FPE : unknown handler > 2HPSIGHANDLER KILL : default handler > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
