unable to create new native thread - linux

[Vijaya Kumar_3]

I am getting this error when i start weblogic.

Throwable: java.lang.OutOfMemoryError: unable to create new native thread

I know it has to do something with number of threads per process.

can anyone tell me what are these these parameters like nproc etc. Is there any parameter that sets no. of threads per process? per user?
pls let me know
thanks
vijay

[Steven E. Protter]

Your Linux distribution would help.

If you are running REd Hat 9, there is a graphical display for making some kernel changes on the fly in X-Windows.

On older distributions, you have to compile a new kernel.

Instructions:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=234110

SEP

[Vijaya Kumar_3]

It is rhl 7.2

i would like to know the parameters, i tried searching for nthreads and nproc... but no luck.

i know we can do on the fly kernel parameter changes in RHL7.2 too. i need to know threads parameters.

thanks
vijay

[Huc_1]

I dont remember in 7.2 but in 9.0 you can find this with the following command, try your luck !

cat /proc/sys/kernel/threads-max

# /sbin/sysctl -a

will also show all the present kernel parameters.

have a read of man sysctl to find out more about changing theses values.

Hope this help by-pass this lack of ressources !

J-P

[Huc_1]

I miss that part of your question on first read and reply.

To set the number of process per user (nproc)

cat /etc/security/limits.conf

tell you the present values
you may change these to meet your needs.

J-P

[Schelstraete Bart_1]

Check out this link, and check the 'increase threads' section:

http://linuxperf.nl.linux.org/general/kerneltuning.html


rgrds,
Bart

[Huc_1]

Thanks, Bart

I found your link to be very good !

The following entry from a few days back is nearly the same so I have posted A link there to to here

link to other question here below
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=237598

Hope theses cross references help reply to both questions.

J-P

[chengsongbo · Accepted solution]

I got the same problem.

For jvm-options:
-Xssn -Xossn -XX:threadstacksize=n
can set thread stack size to n Kilobytes.

These option works under Solaris, AIX,
but under linux, these options seems lose function. So the only way to decrease thread stack size from default 8M to a resonable size is to use system command:

ulimit -s n

This command can be added into the start up script so that only affect the java server.

For my instance, with default setting, my Weblogic server can only use about 800M Heap. When I set thread stack size to 1024k by:

ulimit -s 1024

I can have a heap size at about 1.5G.

For any process under linux, the total memory size cannot exceed 2G. For a JVM process,
MaxHeap + MaxPermsize + threadstacksizee * numberofThreads < 2G.

So you can adjust your setting by you need.

[Vijaya Kumar_3]

Thanks a lot