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The power and procurement cost of bandwidth in system-wide networks has forced a steady drop in the byte/flop ratio. This trend of computation becoming faster relative to the network is expected to hold. In this paper, we explore how cost-oriented task placement enables reducing the cost of system-wide networks by enabling high performance even on tapered topologies where more bandwidth is provisioned...
We introduce a topology-aware performance optimization and modeling workflow for AMR simulation that includes two new modeling tools, ProgrAMR and Mota Mapper, which interface with the BoxLib AMR framework and the SSTmacro network simulator. ProgrAMR allows us to generate and model the execution of task dependency graphs from high-level specifications of AMR-based applications, which we demonstrate...
Coordination languages are an established programming model for distributed computing, but have been largely eclipsed by message passing (MPI) in scientific computing. In contrast to MPI, parallel workers never directly communicate, instead "coordinating" indirectly via key-value store puts and gets. Coordination often focuses on program expressiveness, making parallel codes easier to implement...
Three equilibrium structures and two associated isomerization transition states for the SiCH 2 –HSiCH–CSiH 2 system have been theoretically investigated using highly correlated ab initio methods combined with the correlation-consistent polarized core-valence basis sets. Vibrational second-order perturbation theory (VPT2) has been employed to obtain the zero-point vibration corrected...
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