Hi all, we have a problem with our tomcat 6.0.20 which throws occasionally the following exception: java.lang.OutOfMemoryError: unable to create new native thread Information about the system: - Win2003 Server Standard Edition 32 bit - 2GB RAM - Apache 2.2.13 with open SSL and mod_jk 1.2.28 for the communication with tomcat - 2 instances of tomcat 6.0.20 on different ports. No redundancy / clustering. Each tomcat serves different webapps. - JDK 1.6.0_06
Only one tomcat throws the above noted exception. Configuration-Details: - Tomcat 1 (with the problem) - MaxPermSize=256m - JvmMs 128 - JvmMx 768 - maxThreads for HTTP: 450 - maxThreads for jk: 3000 - Tomcat 2 (no problem yet) - MaxPermSize=256m - JvmMs 128 - JvmMx 512 - MaxThreads for HTTP: 800 - MaxThreads for jk: 450 When Tomcat 1 was throwing the exception the server status was showing the following: - mem Free 116 MB - mem Total 242 MB - mem Max 739 MB - current Thread jk 355 - busy Thread jk 333 - current Thread HTTP 5 - busy Thread HTTP 3 - all connections shown by netstat -an (not filtered): 4595 - connections in state close_wait: 3152 The tomcat was not totally stuck. Already connected sessions seemed to have no problem, but new sessions (new login) threw the exception and did could not be created. The Taskmanager shows that all in all 1.39 GB of RAM are used - much below the 2GB Limit. On the other hand: Shouldn't windows start to swap if the ram is full? In which memory-area does windows handle the memory which is used for the threads? Is it shown in the taskmanager? Can the OS take the mem which is still unused by the JVM (memMax-memTotal) for handling threads or is it reserved for the JVM after starting tomcat? Due to problems with one of our webapps which sometimes does not close the threads completely (they stuck in close_wait-state) we increased the max threads of windows: http://publib.boulder.ibm.com/infocenter/pvcvoice/51x/index.jsp?topic=/com.ibm.websphere.wvs.doc/wvs/tun_conwin.html maxUserPorts have been set to about 30k if i remember correctly. Does anyone have an idea to get rid of the exception? kind regards, Andreas -- "Feel free" - 10 GB Mailbox, 100 FreeSMS/Monat ... Jetzt GMX TopMail testen: http://www.gmx.net/de/go/topmail --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
