Open source software cost analysis with fault severity levels based on stochastic differential equation models

At present, various software services based on the internet network are provided by open source software because of the unification management of data, low cost, and the standardization. We focus on the software service using open source software such as OpenStack and Apache HTTP server. Considering the interesting aspect of the network access, we propose a new cost analysis approach to software reliability assessment based on the stochastic differential equation models using the noise. Moreover, we show several numerical examples of reliability and cost analysis based on stochastic differential equation modeling.