Existing tiered memory systems all use DRAM-Preferred as their al- location policy whereby pages get allocated from higher-performing DRAM until it is filled after which all future allocations are made from lower-performing persistent memory (PM). The novel insight of this work is that the right page allocation policy for a workload can help to lower the access latencies for the newly allocated pages. We design, implement, and evaluate three page allocation policies within the real system deployment of the state-of-the-art dynamic tiering system. We observe that the right page allocation policy can improve the performance of a tiered memory system by as much as 17x for certain workloads.
more »
« less
Free, publicly-accessible full text available June 12, 2024
