Today's Hybrid Transactional and Analytical Processing (HTAP) systems, tackle the ever-growing data in combination with a mixture of transactional and analytical workloads. While optimizing for aspects such as data freshness and performance isolation, they build on the traditional data-to-code principle and may trigger massive cold data transfers that impair the overall performance and scalability. Firstly, in this paper we show that Near-Data Processing (NDP) naturally fits in the HTAP design space. Secondly, we propose an NDP database architecture, allowing transactionally consistent in-situ executions of analytical operations in HTAP settings. We evaluate the proposed architecture in state-of-the-art key/value-stores and multi-versioned DBMS. In contrast to traditional setups, our approach yields robust, resource- and cost-efficient performance.

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The integration of FPGA-based accelerators into a complete heterogeneous system is a challenging task faced by many researchers and engineers, especially now that FPGAs enjoy increasing popularity as implementation platforms for efficient, application-specific accelerators for domains such as signal processing, machine learning and intelligent storage. To lighten the burden of system integration from the developers of accelerators, the open-source TaPaSCo framework presented in this work provides an automated toolflow for the construction of heterogeneous many-core architectures from custom processing elements, and a simple, uniform programming interface to utilize spatially distributed, parallel computation on FPGAs. TaPaSCo aims to increase the scalability and portability of FPGA designs through automated design space exploration, greatly simplifying the scaling of hardware designs and facilitating iterative growth and portability across FPGA devices and families. This work describes TaPaSCo with its primary design abstractions and shows how TaPaSCo addresses portability and extensibility of FPGA hardware designs for systems-on-chip. A study of successful projects using TaPaSCo shows its versatility and can serve as inspiration and reference for future users, with more details on the usage of TaPaSCo presented in an in-depth case study and a short overview of the workflow.