[PLUG] Individual CPU allocation in a multiple CPU architecture ?

[PenguinPuPPy]

Guys i have a question and need some one to answer .The question is as
follows.

1 ) I have a multiple CPU machine say with 4 CPU's .Now I have 3 instances
of an application running on the machine and the OS takes care of the CPU
schedule by default.I want to know is there a way in Linux or any other UNIX
wherein I  can allocate 1 complete CPU to 1 instance of  this application.

Thanks
Jiten