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Serverless computing, also known as FunctionsasaService, is a recent paradigm aimed at simplifying the programming of cloud applications. The idea is that developers design applications in terms of functions, which are then deployed on a cloud infrastructure. The infrastructure takes care of executing the functions whenever requested by remote clients, dealing automatically with distribution and scaling with respect to inbound traffic. While vendors already support a variety of programming languages for serverless computing (e.g. Go, Java, Javascript, Python), as far as we know there is no reference model yet to formally reason on this paradigm. In this paper, we propose the first core formal programming model for serverless computing, which combines ideas from both the λcalculus (for functions) and the πcalculus (for communication). To illustrate our proposal, we model a realworld serverless system. Thanks to our model, we capture the limitations of current vendors and formalise possible amendments.
Maurizio Gabbrielli, Saverio Giallorenzo, Ivan Lanese, Fabrizio Montesi, Marco Peressotti, & Stefano Pio Zingaro. (2019). No More, No Less  A Formal Model for Serverless Computing. In H. R. Nielson & E. Tuosto (Eds.), Coordination Models and Languages  21st IFIP WG 6.1 International Conference, COORDINATION 2019, Held as Part of the 14th International Federated Conference on Distributed Computing Techniques, DisCoTec 2019, Kongens Lyngby, Denmark, June 1721, 2019, Proceedings (Vol. 11533, pp. 148–157). Springer. [https://doi.org/10.1007/9783030223977_9]
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