I am using Linux2.4.20-smp. I think the limits for the entire system are
not problem:
>cat /proc/sys/kernel/threads-max
14336
>cat /proc/sys/fs/file-max
209708
>cat /proc/sys/fs/file-nr
2231   1366   209708
>ulimit -a
core file size     (blocks, -c) 0
data seg size      (kbytes, -d) unlimited
file size         (blocks, -f) unlimited
max locked memory   (kbytes, -l) unlimited
max memory size     (kbytes, -m) unlimited
open files             (-n) 9182
pipe size       (512 bytes, -p) 8
stack size        (kbytes, -s) 8192
cpu time         (seconds, -t) unlimited
max user processes        (-u) 7168
virtual memory     (kbytes, -v) unlimited

But I can't find where the limits for each process/user are. One message
found from google said PTHREAD_THREADS_MAX could be the max thread count
per process. In my /usr/include/bits/local_lim.h, I have

/* The number of threads per process. */
#define _POSIX_THREAD_THREADS_MAX     64
/* This is the value this implementation supports. */
#define PTHREAD_THREADS_MAX   16384

16384 is large enough, I believe. Then what could be the reason of the
error?

By the way, the "Out of Memory" error didn't appear all the time.
Sometimes there was just no response without any error message. Do you
know where I can get more detailed bug files?

Thank you very much.

Qi


On Sat, 6 Dec 2003, Tim Funk wrote:

> When you get "java.lang.OutOfMemoryError: unable to create new native thread"
> it means you are running into an operating system limit. You can give the JVM
> 1 Exabyte of memory and you'll still get this error.
>
> Look at the kernel parameters for your machine and the following limits:
> 1) Threads allowable on the system
> 2) Threads run by a user
> 3) Threads run by a process
> 4) File handles per process
> 5) File handles per user
>
> Use your OS manual or Google to tweak these parameters.
>
> http://jakarta.apache.org/tomcat/faq/memory.html#why
>
> -Tim
>
> qi zhang wrote:
> > Hi,
> >
> > I have stunk on this problem for almost 2 weeks. :-(
> > In these two weeks, I have tried many methods, but it still doesn't work.
> >
> > I built a system to run TPCW benchmark. One web and application server,
> > with tomcat4.0 running, one database with mysql4.0 running on it and
> > several client machines. The Jave version is j2sdk1.4.0_03. The system
> > worked perfect under light load. But when the number of clients
> > exceeded some number (like 600), the tomcat4 didn't work anymore.
> > I checked catalina.out. Sometimes no error message appear, while in some
> > time it appeared the error:
> >
> > SEVERE: Caught exception executing
> > org.apache.tomcat.util.net.TcpWorkerThread@(protected)
> > java.lang.OutOfMemoryError: unable to create new native thread
> >      at java.lang.Thread.start(Native Method)
> >      at
> > org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.<init>(ThreadPool.java:497)
> >      at
>
>
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--
Qi Zhang, Ph.D Student

Department of Computer Science,
College of William and Mary
P.O. Box 8795
Williamsburg, VA 23187-8795



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