Please check your limits (% limit)
They are the same.
8650:
Huff:/usr/src# limit
cputime unlimited
filesize unlimited
datasize 524288 kbytes
stacksize 8192 kbytes
coredumpsize unlimited
memoryuse unlimited
vmemoryuse unlimited
descriptors 548
memorylocked unlimited
maxproc 148
sbsize unlimited
Huff:/usr/src#
4000/90:
Gnat:/usr/src# limit
cputime unlimited
filesize unlimited
datasize 524288 kbytes
stacksize 8192 kbytes
coredumpsize unlimited
memoryuse unlimited
descriptors 548
memorylocked unlimited
maxproc 148
sbsize unlimited
Gnat:/usr/src#
One has 'vmemoryuse', the other doesn't.
Not sure what's up with that...