FROCM: A Fair and Low-Overhead Method in SMT Processor

Simultaneous Multithreading (SMT)[1][2] and chip multiprocessors (CMP) processors [3] have emerged as the mainstream computing platform in major market segments, including PC, server, and embedded domains. However, prior work on fetch policies almost focuses on throughput optimization. The issue of fairness between threads in progress rates is studied rarely. But without fairness, serious problems, such as thread starvation and priority inversion can arise and render the OS scheduler ineffective. The fairness research methods always disturb the threads running Simultaneous, such as single thread sampling [4]. In this paper, we propose an approach FROCM (Fairness Recalculate Once Cache Miss) to enhance the fairness of running multithreads in SMT processor without disturbing their running states. Using FROCM, every thread’s IPCapproximately is re-calculated in SMT processor Once Cache Miss, IPCapproximately is the approximately value of IPC when the thread runs alone. Using IPCapproxim...

• Type: Conference
• Year: 2007
• Where: HPCC
• Authors: Shuming Chen, Pengyong Ma
• Keywords: Cache Miss, Distributed And Parallel Computing, Fairness Research, HPCC 2007, SMT Processor