The customer tested their previous release with 1.3.1 and 1.4.1 (vm
is the only variable). 

The results of the pmap are attached
for 1.3.1 (initially and after load), and for 1.4.1 (initially,
and with load)

Summarising the C Heap::
========================
jdk 1.3.1
Before: 00026000    3856    3440    1264    2176 read/write/exec    [ heap ]
After: 00026000   20112   19616     928   18688 read/write/exec    [ heap ]

jdk 1.4.1
Before: 0002A000    5672    5616    2616    3000 read/write/exec    [ heap ]
After: 0002A000  104304  104232    1096  103136 read/write/exec    [ heap ]

pldd ouput is::

> > 6951:   /usr/j2sdk1.4.1/bin/java -client -XX:+DisableExplicitGC
> > -XX:NewRatio=2
> > /usr/lib/libthread.so.1
> > /usr/lib/libdl.so.1
> > /usr/lib/libc.so.1
> > /usr/platform/sun4u/lib/libc_psr.so.1
> > /usr/j2sdk1.4.1/jre/lib/sparc/client/libjvm.so
> > /usr/lib/libCrun.so.1
> > /usr/lib/libsocket.so.1
> > /usr/lib/libnsl.so.1
> > /usr/lib/libm.so.1
> > /usr/lib/libw.so.1
> > /usr/lib/libmp.so.2 
> > /usr/j2sdk1.4.1/jre/lib/sparc/native_threads/libhpi.so
> > /usr/j2sdk1.4.1/jre/lib/sparc/libverify.so
> > /usr/j2sdk1.4.1/jre/lib/sparc/libjava.so
> > /usr/j2sdk1.4.1/jre/lib/sparc/libzip.so
> > /usr/j2sdk1.4.1/jre/lib/sparc/libnet.so

They are using Solaris 8 (5.8 Generic_108528-17 sun4u sparc Ultra 60)