Java 内存错误:无法创建新的本机线程

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问题描述

运行 java 服务器时，我在 UNIX 服务器上收到此错误:

I get this error on my UNIX server, when running my java server:

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 ...]

每次运行大约 600 个线程时都会发生这种情况.

It happens everytime I have about 600 threads running.

我已经在服务器上设置了这个变量:

I have set up this variable on the server:

$> ulimit -s 128

我觉得奇怪的是这个命令的结果，我在上次出现错误时运行了这个命令:

What looks strange to me is the result of this command, which I ran when the bug occured the last time:

$> free -m
              total       used       free     shared    buffers     cached
Mem:          2048        338       1709          0          0          0
-/+ buffers/cache:        338       1709
Swap:            0          0          0

我像这样启动我的 java 服务器:

I launch my java server like this:

$> /usr/bin/java -server -Xss128k -Xmx500m -jar /path/to/myJar.jar

我的 debian 版本:

My debian version:

$> cat /etc/debian_version
5.0.8

我的java版本:

$> 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)

我的问题:我在互联网上读到我的程序应该处理大约 5000 个线程.那么这是怎么回事，请问如何解决?

这是我打开 shell 时 ulimit -a 的输出:

this is the output of ulimit -a when I open a shell:

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

我将脚本作为来自 init.d 的守护进程运行，这就是我运行的:

I run the script as a daemon from init.d, and this is what i run:

DAEMON=/usr/bin/java
DAEMON_ARGS="-server -Xss128k -Xmx1024m -jar /path/to/myJar.jar"
ulimit -s 128 && ulimit -n 10240 && start-stop-daemon -b --start --quiet --chuid $USER -m -p $PIDFILE --exec $DAEMON -- $DAEMON_ARGS
    || return 2

Edit2:我在线程的 java 测试中遇到了这个堆栈溢出问题:how-many-threads-can-a-java-vm-support

    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();
            }
        }
    }

在我的服务器上，程序在 613 个线程后崩溃.现在我确定这不正常，仅与我的服务器配置有关.有人可以帮忙吗?

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 ?

编辑 3:我遇到过这篇文章和许多其他文章，解释说 linux 可以'不要创建 1000 个线程，但你们告诉我，你可以在你的系统上做到这一点.我不明白.

Edit 3:I have come across this article, and many others, explaining that linux can't create 1000 threads, but you guys are telling me that you can do it on your systems. I don't understand.

我也在我的服务器上运行了这个脚本:threads_limits.c 限制在 620 个线程左右.

I have also ran this script on my server: threads_limits.c and the limit is around 620 threads.

我的网站现在离线，这是我的项目可能发生的最糟糕的事情.我不知道如何重新编译 glibc 和这些东西.工作量太大了.

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.

我想我应该切换到 Windows 服务器.因为此页面上建议的设置都没有进行任何更改:我的系统上的限制是 600 到 620 个线程，无论涉及的程序是什么.

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.

内存错误

Java 内存错误:无法创建新的本机线程

问题描述

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