As multiprocessor systems become increasingly popular, the timing performance must be carefully evaluated to enable sound design decisions before final implementation. Nonetheless, shared resources can cause timing behavior of software hardly predictable. This paper introduces a measurement based on performance capture method coupled with statistical inference to infer the detailed statistical characteristics. It supports simulating various work scene and companion. A set of experiments are presented to validate the introduced methods and different possible results are shown. Based on the inference result, the paper provides several solutions to representing the execution time in multi-core system.