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EnglishWe present Thestral, a 10-core RISC-V chip for energy-proportional parallel computing manufactured in 22 nm FD-SOI technology. Thestral contains a control core and a nine-core compute cluster. Each core features a single-precision floating-point unit (FPU) and an integer processing unit (IPU) and implements custom instruction set architecture (ISA) extensions to improve utilization. The chip features 20 fine-grain power domains: one for each FPU and IPU, as well as one for the entire acceleration cluster. Such aggressive power management granularity is valuable both for extreme-edge computing, where power gating reduces sleep power, and for high-performance computing, where leakage control is required to meet thermal design power constraints and to minimize idle power. We propose a fast and fine-grain power gating architecture with much finer granularity than the state of the art for multi-core computing platforms. A sub-10 ns power-up sequence allows for fine-tuning the compute cluster configuration, powering up only the computational units required for a specific application phase. Our solution enables up to 42% measured power savings for the extreme-edge scenario during sleep mode (@350 MHz, 0.6 V, 25 °C), which is 12.7% more than what can be achieved with aggressive clock-gating. On the other extreme, in an HPC setting, a Thestral-based many-core system running memory-bound applications (@850 MHz, 0.9 V, 75 °C) can save up to 41% power.
| Titolo: | A 10-core SoC with 20 Fine-Grain Power Domains for Energy-Proportional Data-Parallel Processing over a Wide Voltage and Temperature Range | |
| Autore/i: | Benz T.; Bertaccini L.; Zaruba F.; Schuiki F.; Gurkaynak F. K.; Benini L. | |
| Autore/i Unibo: | ||
| Anno: | 2021 | |
| Titolo del libro: | ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings | |
| Pagina iniziale: | 263 | |
| Pagina finale: | 266 | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1109/ESSCIRC53450.2021.9567755 | |
| Abstract: | We present Thestral, a 10-core RISC-V chip for energy-proportional parallel computing manufactured in 22 nm FD-SOI technology. Thestral contains a control core and a nine-core compute cluster. Each core features a single-precision floating-point unit (FPU) and an integer processing unit (IPU) and implements custom instruction set architecture (ISA) extensions to improve utilization. The chip features 20 fine-grain power domains: one for each FPU and IPU, as well as one for the entire acceleration cluster. Such aggressive power management granularity is valuable both for extreme-edge computing, where power gating reduces sleep power, and for high-performance computing, where leakage control is required to meet thermal design power constraints and to minimize idle power. We propose a fast and fine-grain power gating architecture with much finer granularity than the state of the art for multi-core computing platforms. A sub-10 ns power-up sequence allows for fine-tuning the compute cluster configuration, powering up only the computational units required for a specific application phase. Our solution enables up to 42% measured power savings for the extreme-edge scenario during sleep mode (@350 MHz, 0.6 V, 25 °C), which is 12.7% more than what can be achieved with aggressive clock-gating. On the other extreme, in an HPC setting, a Thestral-based many-core system running memory-bound applications (@850 MHz, 0.9 V, 75 °C) can save up to 41% power. | |
| Data stato definitivo: | 27-feb-2022 | |
| Appare nelle tipologie: | 4.01 Contributo in Atti di convegno |
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