🚀 go-pugleaf

Hi-

I'm using JBuilder and the JVM which comes with it (which seems to be the JVM
from Sun's JDK 1.1.2, or a modified version thereof).  For most JVM's, I can
set the native stack size and Java stack size using the -ss and -oss options
to java.exe on the command line.  Unfortunately, the -oss option (and,
presumably, the -ss option as well) has no effect when using the JIT compiler
with the JBuilder JVM.	To see this, run the following stack test program I
wrote:

public class StackTest
{
protected static void recurse(int x)
{
if (x % 100 == 0)
	System.out.println("recurse: " + x);
recurse(x + 1);
System.out.println("end recurse: " + x);	// not reached
}

public static void main(String[] args)
{
recurse(0);
}

}

When the JIT compiler is off (i.e. the java_compiler environment variable is
not set), the number of recursions before a stack overflow depends on the
value I pass in for -oss; for example, java -oss128k StackTest overflows
after about 2800 iterations, but java -oss256k StackTest overflows after
5700.  But if java_compiler=javacomp (which turns on the JIT compiler), then
the number of recursions before overflow is constant, no matter what value I
pass for oss.

This is important to me because I have a program which uses a lot of threads
and eats a lot of memory, and I could greatly reduce memory consumption if I
could specify the stack size for each thread.  So is there actually any way to
specify a stack size when using the JIT compiler?  Would it help to move to
JBuilder 2?

Thanks for any advice or help.

-adam

======
Adam Dingle
Agent Audio

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