混合存储系统中RDMA与本地访问的干扰分析
Analysis of Interference between RDMA and Local Access on Hybrid Memory System
摘要：
我们可以使用由DRAM和Intel Optane DC Persistent Memory组成的混合存储器系统（本文称之为DCPM），因为DCPM自2019年4月起已上市。即使DCPM的延迟比DRAM高几倍，DCPM的容量也比DRAM高几倍，并且DCPM的成本也比DRAM低几倍。此外，DCPM是非挥发性的。具有这种混合内存系统的服务器可以提高内存数据库系统和虚拟机（VM）系统的性能，因为这些系统通常消耗大量内存。此外，可以通过经由远程直接存储器访问（RDMA）访问DCPM来实现高速共享存储系统。我假设一些DCPM经常被分配为其他远程服务器之间的共享区域，因为在具有混合内存系统的服务器上执行的应用程序通常不能使用DCPM的全部容量。本文评估本地内存访问和远程服务器的RDMA之间的干扰。因此，我指出，这种混合存储器系统上的干扰是显着不同的，从传统的DRAM存储器系统。我还认为，当这种干扰发生时，需要某种节流实现。
英文摘要：
We can use a hybrid memory system consisting of DRAM and Intel Optane DC Persistent Memory (We call it DCPM in this paper) as DCPM is now commercially available since April 2019. Even if the latency for DCPM is several times higher than that for DRAM, the capacity for DCPM is several times higher than that for DRAM and the cost of DCPM is also several times lower than that for DRAM. In addition, DCPM is non-volatile. A Server with this hybrid memory system could improve the performance for in-memory database systems and virtual machine (VM) systems because these systems often consume a large amount of memory. Moreover, a high-speed shared storage system can be implemented by accessing DCPM via remote direct memory access (RDMA). I assume that some of the DCPM is often assigned as a shared area among other remote servers because applications executed on a server with a hybrid memory system often cannot use the entire capacity of DCPM. This paper evaluates the interference between local memory access and RDMA from a remote server. As a result, I indicate that the interference on this hybrid memory system is significantly different from that on a conventional DRAM-only memory system. I also believe that some kind of throttling implementation is needed when this interference occures.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
