Twizzler: A Data-centric OS for Non-volatile Memory

Daniel Bittman, P. Alvaro, P. Mehra, D. Long, E. Miller
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引用次数: 31

Abstract

Byte-addressable, non-volatile memory (NVM) presents an opportunity to rethink the entire system stack. We present Twizzler, an operating system redesign for this near-future. Twizzler removes the kernel from the I/O path, provides programs with memory-style access to persistent data using small (64 bit), object-relative cross-object pointers, and enables simple and efficient long-term sharing of data both between applications and between runs of an application. Twizzler provides a clean-slate programming model for persistent data, realizing the vision of Unix in a world of persistent RAM. We show that Twizzler is simpler, more extensible, and more secure than existing I/O models and implementations by building software for Twizzler and evaluating it on NVM DIMMs. Most persistent pointer operations in Twizzler impose less than 0.5 ns added latency. Twizzler operations are up to faster than Unix, and SQLite queries are up to faster than on PMDK. YCSB workloads ran 1.1– faster on Twizzler than on native and NVM-optimized SQLite backends.
Twizzler:一个以数据为中心的非易失性内存操作系统
字节可寻址的非易失性内存(NVM)提供了重新考虑整个系统堆栈的机会。我们介绍Twizzler,一个为不久的将来重新设计的操作系统。Twizzler将内核从I/O路径中移除,使用小的(64位)对象相对的跨对象指针为程序提供内存风格的对持久数据的访问,并在应用程序之间和应用程序的运行之间实现简单而有效的长期数据共享。Twizzler为持久数据提供了一个全新的编程模型,实现了Unix在持久RAM世界中的愿景。我们通过为Twizzler构建软件并在NVM内存上对其进行评估,证明Twizzler比现有的I/O模型和实现更简单、更可扩展、更安全。Twizzler中的大多数持久化指针操作所增加的延迟小于0.5 ns。Twizzler操作比Unix快,SQLite查询比PMDK快。YCSB工作负载在Twizzler上运行1.1——比在原生和nvm优化的SQLite后端上运行要快。
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