OpenSHMEM and related technologies OpenSHMEM in the era of extreme heterogeneity : 5th Workshop, OpenSHMEM 2018, Baltimore, MD, USA, August 21–23, 2018 : revised selected papers - Pophale, Swaroop; Imam, Neena; Aderholdt, Ferrol; Venkata, Manjunath Gorentla (Springer, 2019)