Integration of object modeling and real-time scheduling theory is a key to successful use of object technology for real-time software. Unified Modeling language (UML) is widely used modeling language in software engineering community which supports object-oriented design which in turn encourages component reuse. Recently, system modeling with a Unified Modeling language (UML) is an active research area for developing MPSoC real-time system. Our aim is to propose a unified modeling approach from model design, simulation, until code generation to analyze Rate Monotonic Algorithm for global, partitioned and semi- partitioned scheduling for MPSoC using UML-Real Time. As a technical contribution success ratio and average processor utilization for the generated periodic tasks is compared with various scheduling principles, to validate our proposal.