Revision as of 17:54, 9 May 2017

Internal

On a Linux system, each JVM thread counts as a "process", in that it is subject to system-wide and user-wide process number limitations - see "maximum number of processes allowed on a system" and "maximum number of processes available to a single user". When a JVM instance adjust its number of threads, the change is reflected by /proc/stat "processes" count.

For an example of what happens when the number of Linux processes allowed to an user is reached, see

OutOfMemoryError "unable to create new native thread"

A simple Java program that allows experimenting with threads:

https://github.com/NovaOrdis/playground/tree/master/java/threads/multiple-threads-spinning

Thread Stack Memory Management

@@ Line 22: / Line 22: @@
 ==Java Thread Stack Memory Management==
-The default thread stack size on 64-bit systems is 1024K. 64k is the least amount of stack space allowed per thread.
+{{Internal|Java_Memory_Concepts#Thread_Stack_Memory_Management|Thread Stack Memory Management}}
-It can be modified with with the <tt>-Xss</tt> option:
-<pre>
-java ... -Xss<size> ...
-</pre>
-where "<size>" represents the amount of memory and the measure unit (ex "2048k").
-More about Java memory management can be found here {{Internal|Java_Memory#Concepts|Java Memory}}