This paper presents a method and the associated tools to design and implement embedded real-time systems that execute high-performance-oriented applications on multi-core architectures. After presenting the OASIS design, compilation and execution framework, the paper focuses on the principles of the modifications performed on the safety-oriented real-time kernel to execute transparently and consistently multitasking applications on multi-cores. It then gives the first results of benchmarking performed on a Dassault Aviation's HPC application called “2D-tracking algorithm”. It concludes on the future works towards the introduction of data-parallelism in the OASIS parallel time-triggered programming and underlying execution models.