Performance Engineering and Stochastic Modeling : 17th European Workshop, EPEW 2021, and 26th International Conference, ASMTA 2021, Virtual Event, December 9-10 and December 13-14, 2021, Proceedings - Ballarini, Paolo; Castel, Hind; Dimitriou, Ioannis; Iacono, Mauro; Phung-Duc, Tuan; Walraevens, Joris (Cham Springer International Publishing AG, 2021)