仿真系统.pdf

Watch Memory System on Real Systems by Hardware/Software Hybrid Methods Yungang Bao Princeton University Institute of Computing Technology (ICT), Chinese Academy of Sciences Joint work with Mingyu Chen, Licheng Chen, Zehan Cui, Yongbing Huang, Lei Liu, Yuan Ruan and Dan Tang Memory System: Past and Present • Memory is the key component of computer systems, drawing lots of research efforts • Before 1990, memory capacity was a big issue for whole system performance • In the 1990s, memory wall was raised due to the disparity of CPU and memory speed • We are in the multicore era where scalability, power and QoS are the new challenges Memory System Research Process • Trace-driven Approaches  Thermal Modeling and Memory Trace Generator Management of DRAM Memory Real Systems/Simulators/… Systems (ISCA’07)  M5  Trace  MEMSpot  Memory Prefetching Using Memory Trace Collector Adaptive Stream Detection (Micro’06)  Power5+ Simulator  Trace Trace Analysis/  MemSim Trace-Driven Simulation Software simulation is still the dominated effective method for collecting memory trace. However, Voice of researchers • We collected memory reference traces from a detailed full-system simulator. … (Each simulation still took 1-2 weeks to complete.) … -- Disaggregated Memory for Expansion and Sharing in Blade Servers, ISCA’09 • We