Research On The Energy-Saving Technologies For Phase Change Memory

With the development of computer technology, the memory has become a major bottleneck for computer to improve performance and reduce energy consumption. The next generation memory must have the following characteristics:high capacity density, low power, good performance. PCM is scalability, multiple bits per cell, non-volatile. Meanwhile, PCM cost lower energy than DRAM as main memory. PCM also have the following shortcomings:long access latency, write endurance. However, Non-volatile memory (PCM) is promising to become a replacement for conventional DRAM technology. Because of the complementarity of DRAM and PCM technologies, hybrid architecture can benefit from PCM and DRAM technologies. In this paper, we adopt a hybrid architecture composed with PCM and DRAM and study how to reduce the energy consumption of system. The contributions are as follows:1. Based on DRAM memory parameter model, we propose a unified hybrid memory parameter model and establish energy evaluation formula.2. Under hybrid memory architecture, we modify the memory controller. Add a SRAM table which can record memory access.By read records of table, we obtain access case of physical memory pages and propose a method of page classification.3. On basis of page classification method,we propose a scheduling policy of page migration and further propose page aggregation techniques to save energy.Experiments show that hybrid memory architecture using page migration scheduling policy and page culling reduce energy consumption by average28%with only6%performance overhead.