Default stack size vs. -Xss option

Hi,
What the default stack size?
That is, if you use the -Xss<size> option, it will set the stack
size to <size>, but what is the default. I've searched and only
found one posting that says it is 256k.
http://forum.java.sun.com/thread.jsp?forum=256&thread=40530
Is that correct? Since this is a JVM option, is it platform
dependant? In that case, what would it be on Win2k and Solaris?
We are serializing graph objects and getting a StackOverflowError
on occassion. There is a well known bug about this:
http://developer.java.sun.com/developer/bugParade/bugs/4152790.html
Thanks.
--- Patrick

Hi,
It depends on version and OS.
In Solaris there is in addition the OS restriction in ulimit
or maxssiz in HP.
hurricane% ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) unlimited
stack(kbytes) 8192
coredump(blocks) unlimited
nofiles(descriptors) 4096
vmemory(kbytes) unlimited
Workaround - Use "ulimit -s 2048" in bash shell or "limit stacksize 2048" in tcsh to limit the initial thread stack to 2 MB.
http://java.sun.com/docs/hotspot/VMOptions.html
Check the link for the Solaris defaults.

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Change the default stack size in the java.exe file

Does anyone know how to change the default stack size of the jvm?
I'm having problems with my stack. Is there anyway I can change it. I found a tool editbin.exe which is shipped with Visual c++, however I don't have the tool.
Thanks,
William

I am using JNI to connect java with a C++ application.
When calling the C++ appliction, STACK_OVERFLOW
happends. I tried java -Xss<size> to increase the
stack size, but failed.This has nothing to do with the above question.
Does anyone knows why?Probably because the java parameter specifies the java stack size and not the C++ stack size.

JVM 1.4 default stack size

Hi,
I would like to know what is the default stack size of JVM of jdk 1.4.
Is there any command which i can use to find the current stack size set up?
Is the heap size & stack size same?
Actually i'm getting a java.lang.StackOverflowError when i execute a class ProgramCallDocument which is present in the jt400.jar provided by IBM in thier Websphere Application Studio Server suite.
The class is working fine with jdk 1.3. But it is giving an error in jdk 1.4
Do any one have any clue about this? Please Help.
Thanks,
Jac.

Thanks for the reply...
Actaully I was looking for how to know the current stack size set for JVM. I assume that using -Xss command will increase the stack size, but before doing so I need to take the current stack size.
Please let me know if you know the command for getting the current stack size set for JVM.
Thanks,
Jacob.

Need of changing the default stack size permanently as reported by ulimit -

Hi All,
In order to install proper 11gr2 on solaris 10 I need to make change of stack size permanently.
My current ulimit -s is 8192 but according to the oracle 11g installation docs (Configure Shell Limits) they recommend you change the value reported by ulimit -s to be 32k (or 32768).
I can change this value usiing "ulimit -s 32768" but after reboot of sever this value alwayes change back to old value(8192).
I tried to do that in /etc/projects but not able to make this permanent, How to make stak size permanently in solaris 10.
I am on ...
Oracle Solaris 10 8/11 s10s_u10wos_17b SPARC

Hi;
I suggest please review:
http://serverfault.com/questions/21417/how-to-set-ulimits-in-solaris-10
It seems that parameter will lost after server reboot. SoThe above settings are not permanent and will be lost after the reboot of the server. To make the changes permanent you need to set this in the respective user profile file. (For ex : .bash_profile on linux)
Please review:
Connecting Using: sqlplus "/ as sysdba" Fails with ORA-12547 with Lower Ulimit Setting [ID 878375.1]
Regard
Helios

Optimizing thread stack size

There seems to be general confusion around the actual behaviour of the -Xss option.
I need to optimise the thread stack size on Windows 2000 server running JVM 1.4.2 (07).
1. What is the actual minimum stack size for this JVM ? 1k, 6k, 64k ?
2. Do there exist any mechanism to measure the maximum value actually utilized by a particular application ?
The goal is simply to allocate the appropriate amount of stack space instead of guessing a safe value.

The default stack size is 256K on UNIX and on 32-bit Windows operating systems. To set Stack size
java -XX:NewSize=128m -XX:MaxNewSize=128m -XX:SurvivorRatio=8 -Xms512m -Xmx512m
1. Setting the New generation heap size
-XX:NewSize
Use this option to set the New generation Java heap size. Set this value to a multiple of 1024 that is greater than 1MB. As a general rule, set -XX:NewSize to be one-fourth the size of the maximum heap size. Increase the value of this option for larger numbers of short-lived objects.
Be sure to increase the New generation as you increase the number of processors. Memory allocation can be parallel, but garbage collection is not parallel.
2. Setting the maximum New generation heap size
-XX:MaxNewSize
Use this option to set the maximum New generation Java heap size. Set this value to a multiple of 1024 that is greater than 1MB.
3. Setting New heap size ratios
-XX:SurvivorRatio
The New generation area is divided into three sub-areas: Eden, and two survivor spaces that are equal in size.
Use the -XX:SurvivorRatio=X option to configure the ratio of the Eden/survivor space size. Try setting this value to 8, and then monitor your garbage collection.
4. Setting minimum heap size
-Xms
Use this option to set the minimum size of the memory allocation pool. Set this value to a multiple of 1024 that is greater than 1MB. As a general rule, set minimum heap size (-Xms) equal to the maximum heap size (-Xmx) to minimize garbage collections.
5. Setting maximum heap size
-Xmx
Use this option to set the maximum Java heap size. Set this value to a multiple of 1024 that is greater than 1MB.
Hope these are the options you are looking for.

BUG: Unable to increase stack size in OJVM

Hi,
I have a complex ADF Faces page (jspx) that has reached the level of complexity that I can reliably cause the JVM to die when running the page with:
Fatal error: Cannot find class java/lang/StackOverflowError
Process exited with exit code -1.when running within JDeveloper. I have tried adding
-Xms1024m -Xmx1024m(yes, I know an outrageous stack size) to the project run properties, and it still crashes. However, if I change to the server JVM instead of ojvm, it works fine, even with a much smaller stack, although the default stack size will crash as well.
So,
1). Shouldn't -Xms and -Xmx work for OJVM? If not, this is going to be a pain when I need to debug, as OJVM rocks for that.
2). Is there some way to configure ADF/OC4J so that I won't bomb like this? I'm guessing that the XML document (JSPX) is big enough that it's causing the XML parser to blow up. Just a guess however.
Thanks,
John

It's unclear if the problems discussed happen after OJC compiles, or Javac compiles, or both. We have uncovered a bug in the compilation of jspx files using OJC. There is a chance that this bug fix will fix the problems mentioned. Email me at keimpe.bronkhorst AT oracle.com if you want to try out a patched OJC. This is not an OJVM fix, so if you compile with Javac, I can't help you at this time.
Keimpe Bronkhorst
JDev team

-Xss: Stack size too large

There is a requirement of high stack size in the application but when I try to set the stack size > 128m , I get the below error
[ERROR] Argument error: -Xss130m
[ERROR] -Xss: Stack size too large
Could not create the Java virtual machine.
Is there a upper limit of 128m on stack size. The Jrockit version is 64 bit.
Please help

Hi,
Are you running OS in 32 bit or 64 bit.
eg:
O/S 32-bit Default 64-bit Default
Windows 64 kB 320 kB
Linux 128 kB 1 mB
Please check your stack size you mentioned it is 128m please change to KB it will work.
Regards,
Kal

Cannot increase the stack size

Hi,
We have a program which gives a StackOverflowError. Trying the increase the stack size using command line options does not work. A simple program shows that the stack is the same size, whatever option we set.
This is the program:
class StackOverflowTest
public static int counter = 0;
public static void main(String[] a)
try {
sub();
} catch (StackOverflowError e)
System.out.println("recursive calls: "+counter);
public static void sub()
counter++;
sub();
We tried several -Xss (and -Xoss) settings: 600K, 2048K, 4M but got the same recursion deep: 16683 (with Eclipse), or 16689 (command line).
We used Windows XP.
Do you have any clue?
Many thanks,
Zsolt

Oh good, they seem to have broken the forum formatting again.
====================================================================================================================
Bug ID:     4362291     Stack size argument ignored (-Xss and -ss)
====================================================================================================================
public class StackOverflowTest {
    public static int counter = 0;
    public static final void main(String[] a) {
        new Thread(new Runnable() {
            public void run() {
                try {
                    sub();
                } catch (StackOverflowError e) {
                    System.out.println("recursive calls: "+counter);
        }).start();
    public static final void sub() {
     counter++;
     sub();
/code]

Increase of Stack size impact

Hi there,
Please, what is the impact of increasing the Stack size with the -Xss option for the whole system. is there any relationship or formula between -Xms, -Xmx and -Xss options.
Is it necessary to increase the -Xmx option When i increase the -Xss option.
I'm using Weblogic 9.1 within a machine of 16GB under AIX 64bits and IBM JVM. My parameters are : -Xms=-Xmx=1GB and i think pass the -Xss to 1MB because i get many StackOverflow exceptions.
Think you for your help

hi,
Changing the fonts in Print using ABAP is not possible. as basic report output is a text editor.
By changing "Customizing of Local Layout" will only change in display screen and not in print.
One possible way to create a new printer formatr thry SPAD and use that format in while printing.
to know more details about SPAD
Using SPAD - SAP Spool Administration to print different paper size
The SAP spool system manages its own output devices. This includes mostly printers, but also fax and archiving devices. In order for you to use output devices defined in your operating system from the SAP System, you must define these devices in the SAP spool system.
this is a piece of code from SAP-IMG ...its about printing fonts...see if this helps u....
REPORT ZFONT NO STANDARD PAGE HEADING LINE-SIZE 80 LINE-COUNT 65.
Start of print-control
NEW-PAGE PRINT ON.
PRINT-CONTROL FUNCTION 'SF000'.
WRITE: / 'This is CPI 20'.
SKIP.
PRINT-CONTROL FUNCTION 'SF020'.
WRITE: / 'This is CPI 6'.
SKIP.
PRINT-CONTROL FUNCTION 'SF008'.
WRITE: / 'This is CPI 12'.
Depending on your SAP printer device, this may also work
PRINT-CONTROL FONT 1 LPI 6.
you can try to change font and LPI numbers
WRITE: / 'font 1 lpi 6'.
PRINT-CONTROL FONT 2 LPI 6.
WRITE: / 'font 2 lpi 6'.
PRINT-CONTROL FONT 3 LPI 6.
WRITE: / 'font 3 lpi 6'.
End of print-control
NEW-PAGE PRINT OFF.
*--- End of Program
also check out these links:
For More Info Go thru this Link,
font size in basic list output
http://www.sapdesignguild.org/resources/MiniSG-old/BCMSG03E_DEL.htm
http://sap4.com/modules.php?name=conteni2&pa=showpagina&pid=100
do reward points if it helps
rgds

How to change the default window size display font size on Lync 2013 main window?

Hi champs,
Just a simple non-technical question: How to change the default window size display font size on Lync 2013 main window on Windows 7 desktop?
Thanks,

Hi,
Did you mean change the Lync: Change the Default Font and Color of Instant Messages just as Edwin said above?
If not, as I know, there is no natural way to change it.
If yes, on the latest version of Lync 2013 client, there is a new option “IM” on Lync client “Options” list. And you need to change the default Font and Color of IM in the interface of “IM”.
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Eason Huang
Eason Huang
TechNet Community Support

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Some programs (most importantly for me, Thunderbird) use a default font size that is too small for my eye comfort. Some (such as Firefox) allow me to change the font size, but Thunderbird does not (though there is a menu item to change font size, which does not work).
I gather that such programs are using a default system font size. So I would like to change this. Some Help articles suggested that I could do this from the Font Panel, but they give no indication where to find the Font Panel. I cannot find it in System Preferences or via the Spotlight.
I am using OS X 10.4.7
I am computer-literate, but new to the Mac, having had this computer for about a week and a half.
P.S. In Thunderbird -> Preferences -> Fonts there is an option to configure the fonts used by Thunderbird. The settings affect messages, but not the main window with the message list. However, at this point I'd really like to set the system default so all programs that use the system default will be affected.
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I tried all of them.
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Big Buttons
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NoSquint.
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This is utterly ridiculous.
It's a web browser for GOD sakes...not the OS. It shouldn't be doing anything but displaying web sites with NO INTERVENTION by the user for each and every page.
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== This happened ==
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Default stack size vs. -Xss option

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