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Title: MetaSys: A Practical Open-source Metadata Management System to Implement and Evaluate Cross-layer Optimizations
Authors: Vijaykumar, Nandita
Olgun, Ataberk
Kanellopoulos, Konstantinos
Bostancı, Fatma Nisa
Hassan, Hasan
Lotfi, Mehrshad
Mutlu, Onur
Keywords: Hardware-software cooperation
Architectural Support
Issue Date: 2022
Publisher: Assoc Computing Machinery
Source: Vijaykumar, N., Olgun, A., Kanellopoulos, K., Bostanci, F. N., Hassan, H., Lotfi, M., ... & Mutlu, O. (2022). MetaSys: A Practical Open-source Metadata Management System to Implement and Evaluate Cross-layer Optimizations. ACM Transactions on Architecture and Code Optimization (TACO), 19(2), 1-29.
Abstract: This article introduces the first open-source FPGA-based infrastructure, MetaSys, with a prototype in a RISC-V system, to enable the rapid implementation and evaluation of a wide range of cross-layer techniques in real hardware. Hardware-software cooperative techniques are powerful approaches to improving the performance, quality of service, and security of general-purpose processors. They are, however, typically challenging to rapidly implement and evaluate in real hardware as they require full-stack changes to the hardware, system software, and instruction-set architecture (ISA). MetaSys implements a rich hardware-software interface and lightweight metadata support that can be used as a common basis to rapidly implement and evaluate new cross-layer techniques. We demonstrate MetaSys's versatility and ease-of-use by implementing and evaluating three cross-layer techniques for: (i) prefetching in graph analytics; (ii) bounds checking in memory unsafe languages, and (iii) return address protection in stack frames; each technique requiring only similar to 100 lines of Chisel code over MetaSys. Using MetaSys, we perform the first detailed experimental study to quantify the performance overheads of using a single metadata management system to enable multiple cross-layer optimizations in CPUs. We identify the key sources of bottlenecks and system inefficiency of a general metadata management system. We design MetaSys to minimize these inefficiencies and provide increased versatility compared to previously proposed metadata systems. Using three use cases and a detailed characterization, we demonstrate that a common metadata management system can be used to efficiently support diverse cross-layer techniques in CPUs. MetaSys is completely and freely available at
ISSN: 1544-3566
Appears in Collections:Bilgisayar Mühendisliği Bölümü / Department of Computer Engineering
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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