1. A method for modeling a behavior of an LPAR (logical partition) in a simulated computer operating in a time slice dispatch mode, comprising: beginning a modeling interval; calculating a resource percentage representing a percentage of total resources allocated to the LPAR, wherein the resource percentage is equal to: 100%−a percentage of resources allocated to all other LPARs running in the simulated computer; calculating a time slice percentage for the LPAR based on the resource percentage and CP (central processor) data, wherein: time ⁢ ⁢ slice ⁢ ⁢ percentage = ( resource ⁢ ⁢ percentage ) × ( # ⁢ ⁢ of ⁢ ⁢ physical ⁢ ⁢ CPs ) ( # ⁢ ⁢ of ⁢ ⁢ logical ⁢ ⁢ CPs ) ; determining a CP (central processor) percentage representing a percentage of time that all physical CPs in the computer being modeled have been allocated to the LPAR; if the CP percentage is greater than the time slice percentage, causing the simulated computer not to dispatch CPs to the LPAR; and outputting and displaying the behavior of the modeling.