A last-write-touch prediction scheme used to reduce remote Cache miss latency
Xia Ju · Journal of National University of Defense Technology · 2015
To reduce remote cache transfer latency and improve the performance of shared memory systems,a new last-write-touch prediction scheme that exploits the inherent write characteristics of a program is proposed and a directory protocol to support the scheme is adapted. By predicting a last-write-touch and self downgrading a cache block in advance,a processor can get the data from the memory directly and one network hop can be saved for a remote cache access. Compared with the existing instruction-based prediction technique,much storage overhead can be reduced. Experimental results show that it can achieve an average prediction accuracy of 83. 1%,leading to improvements up to average 8. 57% on the final application performance. Moreover,compared with the instruction-based prediction scheme,the scheme can reduce the storage overheads of the history table by 69% and the storage overheads of the signature table by 36%.