CAP: Criticality analysis for power-efficient speculative multithreading

While Speculative Multithreading (SM) on a Chip Multiprocessor (CMP) has the ability to speed-up hard-toparallelize applications, the power inefficiency of aggressive speculation is a concern. To improve SM's power efficiency, we note that not all the tasks that are running in a SM environment are equally critical. To leverage this insight, this paper develops a novel, widely-applicable task-criticality model for SM. It also proposes CAP, a novel architecture that builds a task-criticality graph dynamically and uses it to make scheduling decisions in a SM CMP. Experiments with SPECint, SPECfp, and Olden applications show that, in a CMP with one fast core and three slow ones, the E

• Type: Conference
• Year: 2007
• Where: ICCD
• Authors: James Tuck, Wei Liu, Josep Torrellas
• Keywords: Hardware, ICCD 2007, SM CMP, SM Environment, SM's Power Efficiency