To mitigate this problem, you can consider reducing the Heap Size from 5GB to 4GB (if your application can accommodate it without running into other memory bottlenecks). It may not be sufficient, and most likely the application will start to experience “: unable to create new native thread”. Note in this 0.5 GB space – kernel processes, other user processes and threads has to run. 5 GB heap + 512 MB Perm Gen) is used by the JVM Heap and it leave only 0.5GB (i.e. XX:MaxPermSize and -XX:MaxPermSize)Īs per this configuration 5.5 GB (i.e. So let’s consider this example: Overall RAM size So if there is less room left in the RAM, after the JVM heap allocation, application will run into “: unable to create new native thread”. One very important point that even seasoned engineers forget is: threads are not created within the JVM heap. In such circumstance, allocate more memory to the machine. If you don’t see a high number of threads created and “ulimit –u” value is well ahead then it’s indicative that your application has grown organically and needed more memory to create threads. In such circumstances increase this limit. So if your application is creating more than 1024 threads, it’s going to run into “: unable to create new native thread”. It means totally only 1024 threads can be created in this machine. In certain servers, I have seen this value set to a low value such as 1024. The limit can be found by issuing ulimit –uĬommand. The Operating System has limits for the number of threads that can be created. Increase the Thread Limits Set at Operating System Check out the ‘real world example’ section of this article, which walks through a ‘: unable to create new native thread’ problem experienced a major B2B travel application and how tool was used to diagnose the problem. You can use online thread dump analyzer tool such as (which I would highly recommend), to see how many threads are created? What is the stack trace of those excessively created threads? Who is creating them? Once you know to these questions, it’s easy to solution them. When you see “: unable to create new native thread”, you should diagnose whether the application has started to create more threads. Depending on what event is triggering this error, either one or a combination of the below mentioned solutions can be applied to resolve the problem. There are 6 potential solutions to address this : unable to create new native threadĮrror. The number of threads exceeds the Operating System limit.There is no room in the memory to accommodate new threads.This error can surface because of following two reasons:
Is one of the commonly occurring flavor. This type of ‘OutOfMemoryError’ is generated when an application isn’t able to create new threads. In these 8 flavors : unable to create new native thread
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