We evaluated Intel® Optane™ DC Persistent Memory and found that Intel's persistent memory is highly sensitive to data locality, size, and access patterns, which becomes clearer by optimizing both virtual memory page size and data layout for locality. Using the Polybench high-performance computing benchmark suite and controlling for mapped page size, we evaluate persistent memory (PMEM) performance relative to DRAM. In particular, the Linux PMEM support maps preferentially maps persistent memory in large pages while always mapping DRAM to small pages. We observed using large pages for PMEM and small pages for DRAM can create a 5x difference in performance, dwarfing other effects discussed in the literature. We found PMEM performance comparable to DRAM performance for the majority of tests when controlled for page size and optimized for data locality.

中文翻译：

---

英特尔®傲腾DC持久内存表现出乎意料


我们评估了英特尔® 傲腾™ DC 持久内存，发现英特尔持久内存对数据局部性、大小和访问模式高度敏感，通过针对局部性优化虚拟内存页面大小和数据布局，这一点变得更加清晰。使用 Polybench 高性能计算基准测试套件并控制映射页面大小，我们评估了相对于 DRAM 的持久内存 (PMEM) 性能。特别是，Linux PMEM 支持映射优先将持久内存映射到大页面，同时始终将 DRAM 映射到小页面。我们观察到，对 PMEM 使用大页面，对 DRAM 使用小页面可以产生 5 倍的性能差异，使文献中讨论的其他效果相形见绌。我们发现，在控制页面大小并针对数据局部性进行优化时，大多数测试的 PMEM 性能与 DRAM 性能相当。