Pre-execution helper threads were needed to perform dynamic prefetching in the prefetch process. However, the traditional static enumeration parameter value was keep constant during in the execution of prefetching, so that the method can not effectively provide prefetching quality. To solve this problem, this paper proposed a method of prefetching quality control based on prefetching rate. Firstly, it analyzed the model of helper thread prefetching QoS optimization. Secondly, based on the previous work, this paper put forward the algorithm of parameter value adjustment based on prefetching rate. In the end, it evaluated and analyzed the algorithm on the real commercial multi-core platform. Experimental results were as follows. With the proposed prefetching adjusting algorithm, the geometric average performance speed up of the benchmarks was 1.114. It was similar to the traditional static enumeration method's geometric average performance speed up which was 1.135. The experimental results show that the proposed algorithm can solve the helper thread prefetching quality adjust problem, as well can quickly obtain the similar prefetching performance compared with the static enumeration method.

[2019-02-05] Printed Article /doc/2017.09.0877/v2