RT-kNNS Unbound: Using RT Cores to Accelerate Unrestricted Neighbor Search
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RT-Bench is a framework and community project that aims to establish a unified set of benchmarks with a homogeneous launch and result reporting interface, and with a simple build system. RT-Bench targets academic researchers and industry practitioners interested in understanding the performance characteristics of embedded/real-time systems when tested over realistic use-case applications. To facilitate real-time systems research, RT-Bench is designed from the ground up to include a set of fundamental capabilities such as periodic execution, selectable OS scheduler, and native and multi-architecture performance counters support, to name a few. RT-Bench has undergone continuous improvements and extensions. This paper reviews the most recent additions and features of the framework. Most prominently, these include heap migration, synchronized benchmark release, and experimental support for multi-threaded applications. This contribution includes a tutorial session with template benchmarks to showcase the new features and illustrate the process of integrating new benchmark suites.more » « less
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Abstract Infrared (IR) studies of asymptotic giant branch (AGB) stars are critical to our understanding of the formation of cosmic dust. In this investigation, we explore the mid- to far-IR emission of the oxygen-rich AGB star RT Virginis. This optically thin dusty environment has unusual spectral features when compared to other stars in its class. To explore this enigmatic object we use the one-dimensional radiative transfer modeling code DUSTY. Modeled spectra are compared with observations from the Infrared Space Observatory, InfraRed Astronomical Satellite, the Herschel Space Observatory, and a host of other sources to determine the properties of RT Vir's circumstellar material. Our models suggest a set of two distant and cool dust shells at low optical depths (τV,inner= 0.16,τV,outer= 0.06), with inner dust temperaturesT1= 330 K,T3= 94 K. Overall, these dust shells exhibit a chemical composition consistent with dust typically found around O-rich AGB stars. However, the distribution of materials differs significantly. The inner shell consists of a mixture of silicates, Al2O3, FeO, and Fe, while the outer shell primarily contains crystalline Al2O3polymorphs. This chemical change is indicative of two distinct epochs of dust formation around RT Vir. These changes in dust composition are driven by either changes in the pressure–temperature conditions around the star or by a decrease in the C/O ratio due to hot-bottom burning.more » « less
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