How to set JVM to have more 1GB stack size?

Question

My OS info is as below:

Linux 3.1.10-1.16-default #1 SMP Wed Jun 27 05:21:40 UTC 2012 (d016078) x86_64 x86_64 x86_64 GNU/Linux

My JDK info is:

java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.3) (suse-6.2-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

But if I use more than 1GB stack,

 java -Xss2g -Xmx100g Test

I got this:

Error occurred during initialization of VM
java.lang.OutOfMemoryError: unable to create new native thread
    at java.lang.Thread.start0(Native Method)
    at java.lang.Thread.start(Thread.java:657)
    at java.lang.ref.Reference.<clinit>(Reference.java:162)

So, how could I use more than 1GB stack?

Use "ulimit -a" I got this:

core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 1291902
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) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1291902
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

From this, it seems the stack size limit is just 8MB. But it succeeded with 1GB.

Answer 1

You don't need either a 2G stack or a 100G heap, and in any event your physical hardware is most unlikely to be able to supply them. Why are you using such enormous numbers?