NSDI

Authors: Abdullah Alomar, Pouya Hamadanian, Arash Nasr-Esfahany, Anish Agarwal, Mohammad Alizadeh, and Devavrat Shah, MIT Abstract: We present CausalSim, a causal framework for unbiased trace-driven simulation. Current trace-driven simulators assume that the interventions being simulated (e.g., a new algorithm) would not affect the validity of the traces. However, real-world traces are often biased by the choices algorithms make during trace collection, and hence replaying traces under an intervention may lead to incorrect results....

Authors: Ali Najafi, Meta; Michael Wei, VMware Research Abstract: High performance, strongly consistent applications are beginning to require scalable sub-microsecond clock synchronization. State-of-the-art clock synchronization focuses on improving accuracy or frequency of synchronization, ignoring the properties of the local clock: lost of connectivity to the remote clock means synchronization failure. Our system, Graham, leverages the fact that the local clock still keeps time even when connectivity is lost and builds a failure model using the characteristics of the local clock and the desired synchronization accuracy....

Authors: Paras Jain, Sam Kumar, Sarah Wooders, Shishir G. Patil, Joseph E. Gonzalez, and Ion Stoica, University of California, Berkeley Abstract: Cloud applications are increasingly distributing data across multiple regions and cloud providers. Unfortunately, widearea bulk data transfers are often slow, bottlenecking applications. We demonstrate that it is possible to significantly improve inter-region cloud bulk transfer throughput by adapting network overlays to the cloud setting—that is, by routing data through indirect paths at the application layer....