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Message from discussion Java 613 Threads limit: unable to create new native thread
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Philipp Hagemeister  
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 More options Nov 21 2011, 8:20 am
Newsgroups: linux.debian.maint.java
From: Philipp Hagemeister <phi...@phihag.de>
Date: Mon, 21 Nov 2011 14:20:02 +0100
Local: Mon, Nov 21 2011 8:20 am
Subject: Re: Java 613 Threads limit: unable to create new native thread
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First of all: What error message do you get? How much memory do you have
in the system? What is the output of  uname -a  on your system?

On my system, this program easily goes to 10000, although it demands a
lot of memory. You may want to specify a lower stack size, like this:

java -Xss150k DieLikeADog

Also, make sure you have sufficient memory available, basically the
number of threads * memory required for an empty thread. Since each
thread seems to take about 100k, this boils down to at least a GiB for
10k threads. YMMV. Note that on a 32-bit architecture, you will run out
of address space long before running out of actual memory. While you
could do crazy things with fork, I *strongly* recommend you use a 64-bit
architecture.

If you plan on having a quadruple-digits number of threads, I suggest
you either rewrite your code to use threadpools or use really fast
hardware with lots of memory (say, 10GiB)..

- -- Philipp

Keyja Keyja wrote:
> Hello,

> I am running the following code on my debian server:

> 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();
>     }
>   }
> }

> I got this code here:
> http://stackoverflow.com/questions/763579/how-many-threads-can-a-java...

> On my server, the program crashes after 613 threads. This is not
> normal, and has to be related to my server configuration. I had the OS
> installed when I started to rent the server at http://www.nuxit.com/
> and I never messed with the configuration.

> Debian version: 5.0.8
> Java version: 1.6.0_26

> Can anyone help me please ? I was forced to put my website offline
> because of this bug. I always have this limit of 613 threads no matter
> which program I run on my debian server.

> Can anyone help please ?

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