I have the following env:
$ ulimit -s
100000
$ ulimit -i
63645
$ cat /proc/sys/kernel/threads-max
127626
$ cat /proc/sys/vm/max_map_count
600000
$ cat /proc/sys/kernel/pid_max
200000
$ java -Xmx4G -Xss256k -cp . ThreadCreation
...
11542
11543
java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:717)
at ThreadCreation.main(ThreadCreation.java:15)
The following testing class
public class ThreadCreation {
public static void main(String[] args) {
try {
for (int i = 0; i < 100000; i++) {
System.out.println(i);
new Thread("Thread-" + i) {
@Override
public void run() {
try {
Thread.sleep(1000000000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}.start();
}
} catch (Throwable t) {
t.printStackTrace();
System.exit(0);
}
}
}
This is the ulimit status:
$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 63645
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 100000
cpu time (seconds, -t) unlimited
max user processes (-u) 63645
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
Can you please help me on what I'm doing wrong? Thanks! It's OpenJDK 1.8.0. I know I should use ExecutorService, but this is just for testing/demo purposes.
There should be enough memory:
$ free
total used free shared buff/cache available
Mem: 16336132 5935372 3513992 1377844 6886768 8600916
Swap: 16678908 0 16678908
I tried lots of suggestions suggested by other StackOverflow questions but none worked for me; that's why I'm opening a new question.
