Testing multi-threaded applications is a daunting problem mainly due to the non-deterministic runtime behavior of paralleled programs. Though the execution of multi-threaded applications primarily depends on context switches, it is not clear which environmental factors and to what degree control the threads scheduling. In this paper, we intend to identify environmental factors and their effects on the frequency of concurrency fault occurrences. The test practitioners and researchers will find the identified factors beneficial when testing paralleled applications. We conduct an exploratory study on the effect of multicore platforms on fault exposures. The result provides no support of the hypothesis that number of cores has some impact on fault exhibitions.