冠军的早餐:走向零拷贝串行化与NIC散集

Deepti Raghavan, P. Levis, M. Zaharia, Irene Zhang
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引用次数: 21

摘要

微秒I/O将使数据序列化成为数据中心应用程序的主要瓶颈。序列化基本上是关于数据移动的:序列化库将内存中的数据结构合并并平面化到单个可传输的缓冲区中。由于数据移动开销,基于cpu的序列化方法将达到性能限制,并且无法跟上现代网络。我们观察到,广泛部署的nic具有分散-收集功能,可以重新利用这些功能来加速序列化的核心任务,即合并和平坦化内存中的数据结构。使用普通nic构建完全零拷贝、零分配的序列化库是可能的。这样做会带来许多研究挑战,包括有效地为各种非统一数据结构使用硬件功能,使应用程序内存可用于零复制I/O,以及确保内存安全性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Breakfast of champions: towards zero-copy serialization with NIC scatter-gather
Microsecond I/O will make data serialization a major bottleneck for datacenter applications. Serialization is fundamentally about data movement: serialization libraries coalesce and flatten in-memory data structures into a single transmittable buffer. CPU-based serialization approaches will hit a performance limit due to data movement overheads and be unable to keep up with modern networks. We observe that widely deployed NICs possess scatter-gather capabilities that can be re-purposed to accelerate serialization's core task of coalescing and flattening in-memory data structures. It is possible to build a completely zero-copy, zero-allocation serialization library with commodity NICs. Doing so introduces many research challenges, including using the hardware capabilities efficiently for a wide variety of non-uniform data structures, making application memory available for zero-copy I/O, and ensuring memory safety.
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