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POJava Memory error: unable to create new native thread
 

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    <p>I get this error on my UNIX server, when running my java server:</p> <pre><code>Exception in thread "Thread-0" java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.java:640) at [... where ever I launch a new Thread ...] </code></pre> <p>It happens everytime I have about 600 threads running.</p> <p>I have set up this variable on the server:</p> <pre><code>$&gt; ulimit -s 128 </code></pre> <p>What looks strange to me is the result of this command, which I ran when the bug occured the last time:</p> <pre><code>$&gt; free -m total used free shared buffers cached Mem: 2048 338 1709 0 0 0 -/+ buffers/cache: 338 1709 Swap: 0 0 0 </code></pre> <p>I launch my java server like this:</p> <pre><code>$&gt; /usr/bin/java -server -Xss128k -Xmx500m -jar /path/to/myJar.jar </code></pre> <p>My debian version:</p> <pre><code>$&gt; cat /etc/debian_version 5.0.8 </code></pre> <p>My java version:</p> <pre><code>$&gt; java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) </code></pre> <p><strong>My question: I have read on Internet that my program should handle something like 5000 threads or so. So what is going on, and how to fix please ?</strong></p> <hr> <p>Edit: this is the output of <code>ulimit -a</code> when I open a shell:</p> <pre><code>core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 794624 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 100000 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) 794624 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited </code></pre> <p>I run the script as a daemon from init.d, and this is what i run:</p> <pre><code>DAEMON=/usr/bin/java DAEMON_ARGS="-server -Xss128k -Xmx1024m -jar /path/to/myJar.jar" ulimit -s 128 &amp;&amp; ulimit -n 10240 &amp;&amp; start-stop-daemon -b --start --quiet --chuid $USER -m -p $PIDFILE --exec $DAEMON -- $DAEMON_ARGS \ || return 2 </code></pre> <hr> <p>Edit2: I have come across this stack overflow question with a java test for threads: <a href="https://stackoverflow.com/questions/763579/how-many-threads-can-a-java-vm-support">how-many-threads-can-a-java-vm-support</a></p> <pre><code> public class DieLikeADog { private static Object s = new Object(); private static int count = 0; public static void main(String[] argv){ for(;;){ new Thread(new Runnable(){ public void run(){ synchronized(s){ count += 1; System.err.println("New thread #"+count); } for(;;){ try { Thread.sleep(100); } catch (Exception e){ System.err.println(e); } } } }).start(); } } } </code></pre> <p>On my server, the program crashes after 613 threads. Now i'm certain this is not normal, and only related to my server configuration. Can anyone help please ?</p> <hr> <p>Edit 3: I have come across this article, and many others, explaining that <a href="http://gallium.inria.fr/~xleroy/linuxthreads/faq.html#D.10" rel="nofollow noreferrer">linux can't create 1000 threads</a>, but you guys are telling me that you can do it on your systems. I don't understand.</p> <p>I have also ran this script on my server: <a href="http://people.redhat.com/alikins/tuning_utils/thread-limit.c" rel="nofollow noreferrer">threads_limits.c</a> and the limit is around 620 threads.</p> <p>My website is now offline and this is the worst thing that could have happened to my project. I don't know how to recompile glibc and this stuff. It's too much work imo.</p> <p>I guess I should switch to windows server. Because none of the settings proposed on this page did make any change: The limit on my system is between 600 and 620 threads, no matter the program involved.</p>
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    1. COIt's a game server. I open 2 threads for each client: 1 for TCP-read, and 1 for TCP-write. The server crashes when I reach 300 clients, but I have tons of memory left, so why ?
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    2. CO@Brian Roach: Why not? Real server hardware can churn with pretty high amounts of threads without much problems, when the settings are correct.
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    3. COAnd what would these correct settings be, please ?
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