Token3D: Reducing Temperature in 3D Die-Stacked CMPs through Cycle-Level Power Control Mechanisms

Abstract

Abstract. Nowadays, chip multiprocessors (CMPs) are the new standard design for a wide range of microprocessors: mobile devices (in the near future almost every smartphone will be governed by a CMP), desktop computers, laptop, servers, GPUs, APUs, etc. This new way of increasing performance by exploiting parallelism has two major drawbacks: off-chip bandwidth and communication latency between cores. 3D die-stacked processors are a recent design trend aimed at overcoming these drawbacks by stacking multiple device layers. However, the increase in packing density also leads to an increase in power density, which translates into thermal problems. Different proposals can be found in the literature to face these thermal problems such as dynamic thermal management (DTM), dynamic voltage and frequency scaling (DVFS), thread migration, etc. In this paper we propose the use of microarchitectural power budget techniques to reduce peak temperature. In particular, we first introduce Token3D, a new power balancing policy that takes into account temperature and layout information to balance the available per core power along other power optimizations for 3D designs. And second, we analyze a wide range of floorplans looking for the optimal temperature configuration. Experimental results show a reduction of the peak temperature of 2-26ºC depending on the selected floorplan.