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A Lightweight Transactional Design in Flash-based SSDs to Support Flexible Transactions

LightTx :. A Lightweight Transactional Design in Flash-based SSDs to Support Flexible Transactions. Youyou Lu 1 , Jiwu Shu 1 , Jia Guo 1 , Shuai Li 1 , Onur Mutlu 2. 1 Tsinghua University 2 Carnegie Mellon University.

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A Lightweight Transactional Design in Flash-based SSDs to Support Flexible Transactions

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  1. LightTx: A Lightweight Transactional Design in Flash-based SSDs to Support Flexible Transactions Youyou Lu1, Jiwu Shu1, Jia Guo1, Shuai Li1, Onur Mutlu2 1Tsinghua University 2Carnegie Mellon University

  2. Data updated in a single operation should be performed atomically and durably , and this is called a transaction. Software Transactions High overhead: Duplicated writes Synchronization for ordering Software HDD Data Area Log Area

  3. Flash pages are update in an out-of-place way, but this property is transparent from the software by the Flash Translation Layer (FTL) in SSDs. • Hardware Supported Transactions • Problem: • How to support different isolations? (Flexible transaction requirement from software) • How to cluster pages for each transaction? (Internal Parallelism of SSDs) Software SSD Data Area

  4. Design Issues: • Flexibility: support tx with flexible requirements • Lightweight: low overhead on the device • Observations and Key Ideas: • Simultaneous updates can be written to different physical pages, and the FTL mapping table determines the ordering => (Flexibility) make commit protocol page-independent • Transactions have birth and death, and the near-logged update way enables efficient tracking => (Lightweight) track recently updated flash blocks, and retire the dead transactions • Results: • 20.6% throughput improvement (flexibility) • Stable garbage collection overhead • Fast recovery with negligible persistence overhead

  5. Today 1:15pm CSA-2: Memory Systems LightTx: A Lightweight Transactional Design in Flash-based SSDs to Support Flexible Transactions Youyou Lu1, Jiwu Shu1, Jia Guo1, Shuai Li1, Onur Mutlu2 1Tsinghua University 2Carnegie Mellon University

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