Running jvm 32 on SUNW,UltraSPARC-IIe, OS 5.8

I am using java 1.4.2_05 jvm on SUNW,UltraSPARC-IIe in 32 bit mode defualt. The SUN os is configured to run in 64 Bit mode.
My question is
1) What is the effect of JVM 32 running on a 64 Bit OS
2) I am using a JNI in my project. The system goes into hanging mode during calls to jni methods and it sporadic.
4) I am not able to make a thread dump using kill -3 <java pid>
Is there a way to make a java thread dump under these situatuations.

I am using java 1.4.2_05 jvm on SUNW,UltraSPARC-IIe
in 32 bit mode defualt. The SUN os is configured to
run in 64 Bit mode.
My question is
1) What is the effect of JVM 32 running on a 64 Bit OSYou cannot allocate more than 3.8 GB of heap (if you
have that much physical memory).
2) I am using a JNI in my project. The system goes
into hanging mode during calls to jni methods and it
sporadic.I would recommend trying Sun Studio 9
http://wwws.sun.com/software/products/studio/index.html
It comes with great Java/Native debugger and profiler.
4) I am not able to make a thread dump using kill -3
<java pid>Unless you are starting with the -Xrs option, it probably
means you're stuck somewhere in native code.
Is there a way to make a java thread dump under these
situatuations.Studio 9
-Alexis

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