Tools for High Performance Computing 2018 / 2019 : Proceedings of the 12th and of the 13th International Workshop on Parallel Tools for High Performance Computing, Stuttgart, Germany, September 2018, and Dresden, Germany, September 2019 - Mix, Hartmut; Nagel, Wolfgang E.; Niethammer, Christoph; Resch, Michael M.; Zhou, Huan (Springer International Publishing, 2021)