java/lang/OutOfMemoryError":"Failed to fork OS thread请教
> OS Name: AIX
> OS Version: 5.3
xms768m
xmx1024m
javacore:
heap space free: asfcfb58
heap space allocated:30000000
在运行一天左右，就会出现java/lang/OutOfMemoryError":"Failed to fork OS thread的异常，jvm打出一个core文件。这时，大部分线程将进入wait状态，导致很多业务不能运行，请教各位大侠是否遇到过同样的情况。
上周突然就这样了，之前一直也没有事。到底什么原因啊？？？
> OS Version: 5.3
xms768m
xmx1024m
javacore:
heap space free: asfcfb58
heap space allocated:30000000
在运行一天左右，就会出现java/lang/OutOfMemoryError":"Failed to fork OS thread的异常，jvm打出一个core文件。这时，大部分线程将进入wait状态，导致很多业务不能运行，请教各位大侠是否遇到过同样的情况。
上周突然就这样了，之前一直也没有事。到底什么原因啊？？？
8同行回答
另一种可能：
The problems was solved setting Xmx parameters
for example, your OS has 3 gb RAM.
your java processs is -Xmx1440m, that means almost 1.5 gb .
ok. your process starts, it works for a while.... but at any moment after get that much memory it blows up saying Failed to fork OS thread.
that is because, at least in windows, allows you to allocate as max the half of memory for a process, but you are not counting on java overhead. Then, if it tries to get more "permitted" memory it will blow up because the OS is not allowing to create new threads.
my advice.
1. if you want to allocate a lot of memory, use 40% as max of the total RAM of the OS (in windows) using Xmx params.
2. also, tweak the parameter -XX:ThreadStackSize=128 to reduce it, the default is 512 and that is too much收起
The problems was solved setting Xmx parameters
for example, your OS has 3 gb RAM.
your java processs is -Xmx1440m, that means almost 1.5 gb .
ok. your process starts, it works for a while.... but at any moment after get that much memory it blows up saying Failed to fork OS thread.
that is because, at least in windows, allows you to allocate as max the half of memory for a process, but you are not counting on java overhead. Then, if it tries to get more "permitted" memory it will blow up because the OS is not allowing to create new threads.
my advice.
1. if you want to allocate a lot of memory, use 40% as max of the total RAM of the OS (in windows) using Xmx params.
2. also, tweak the parameter -XX:ThreadStackSize=128 to reduce it, the default is 512 and that is too much收起
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以下是一种可能：
This section explains the following error:
java.lang.OutOfMemoryError: Failed to fork OS thread
This error occurs when thousands of threads are started in very quick succession (almost simultaneously). The error indicates that the upper limit on the number of concurrent threads for the JVM has been reached.
Normally this error occurs when a Javascript loop starts thousands of threads in a very short period of time. This error should not occur in normal conditions in which Tivoli® Directory Integrator solutions usually operate.
You can avoid this error by inserting a very small delay between starting successive threads (even as small as 1 millisecond). This delay can cause performance to decrease a little, but the error would disappear.收起
This section explains the following error:
java.lang.OutOfMemoryError: Failed to fork OS thread
This error occurs when thousands of threads are started in very quick succession (almost simultaneously). The error indicates that the upper limit on the number of concurrent threads for the JVM has been reached.
Normally this error occurs when a Javascript loop starts thousands of threads in a very short period of time. This error should not occur in normal conditions in which Tivoli® Directory Integrator solutions usually operate.
You can avoid this error by inserting a very small delay between starting successive threads (even as small as 1 millisecond). This delay can cause performance to decrease a little, but the error would disappear.收起
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