Compatible phase co-scheduling on a CMP of multi-threaded processors

The industry is rapidly moving towards the adoption of Chip Multi-Processors (CMPs) of Simultaneous MultiThreaded (SMT) cores for general purpose systems. The most prominent use of such processors, at least in the near term, will be as job servers running multiple independent threads on the different contexts of the various SMT cores. In such an environment, the co-scheduling of phases from different threads plays a significant role in the overall throughput. Less throughput is achieved when phases from different threads that conflict for particular hardware resources are scheduled together, compared with the situation where compatible phases are co-scheduled on the same SMT core. Achieving the latter requires precise per-phase hardware statistics that the scheduler can use to rapidly identify possible incompatibilities among phases of different threads, thereby avoiding the potentially high performance cost of inter-thread contention. In this paper, we devise phase co-scheduling po...

• Type: Conference
• Year: 2006
• Where: IPPS
• Authors: Ali El-Moursy, R. Garg, David H. Albonesi, Sandhya Dwarkadas
• Keywords: Compatible Phases, Distributed And Parallel Computing, IPPS 2006, Smt Core, Various Smt Cores