AIX has the ability to limit the scheduler to take into effect the expected average "load" and base its decisions on CPU and Memory usage.

Since the Whole of Java and the Appserver was in memory, and it had Plenty of RAM, Multiple CPU (4) and fast I/O Drives (SSA) and 2 - GBit ENET card... It really was not ever in any pain from scheduling (init) taking over.

2.6 has a scheduler with similar capacity.