“java.lang.OutOfMemoryError : unable to create new native Thread”

We are getting "java.lang.OutOfMemoryError : unable to create new native Thread” on 8GB RAM VM after 32k threads (ps -eLF| grep -c java)

However, "top" and "free -m" shows 50% free memory available. JDk is 64 bit and tried with both HotSpot and JRockit.Server has Linux 2.6.18

We also tried OS stack size (ulimit -s) tweaking and max process(ulimit -u) limits, limit.conf increase but all in vain.

Also we tried almost all possible of heap size combinations, keeping it low, high etc.

The script we use to run application is

/opt/jrockit-jdk1.6/bin/java -Xms512m -Xmx512m -Xss128k -jar JavaNatSimulator.jar /opt/tools/jnatclients/natSimulator.properties

Thanks for the reply.

We have tried editing /etc/security/limits.conf and ulimit but still that same

[root@jboss02 ~]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 72192
max locked memory       (kbytes, -l) 32
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65535
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 72192
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

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