Design and implementation of multi-thread persistent b+ tree data structure

Abstract

The invention discloses a method for designing and realizing a multithreaded persistent B + tree data structure. The method comprises the following steps: a layer of shadow leaf nodes based on a chainstructure is introduced into a preset B + tree; the leaf node based on linked list is stored in the NVM through the data layout strategy based on the mixed main memory, to generate a tree layer basedon the array structure and store other portions of the index data structure in the DRAM to generate a chain layer based on the linked list structure such that the persistence overhead of balancing and sorting is avoided through the design of a hierarchical volatile tree structure and a persistent linked list structure; embedded fine-grained locking mechanism and optimistic write mechanism are designed for concurrency control between read and write operations and between write and write operations respectively. The method uses the mixed main memory data structure of non-volatile memory and volatile memory to increase the concurrency of data retrieval and realize data persistent storage, solve the problem of magnified lock overhead, and accelerate the system recovery process of data structure.

Description

technical field [0001] The invention relates to the technical field of non-volatile main memory storage, in particular to a multi-thread persistent B+ tree data structure design and implementation method. Background technique [0002] Non-volatile main memory (Non-Volatile Memory, NVM) is a new type of memory storage medium, which has byte addressability, non-volatile information after power failure, high storage density, no need for dynamic refresh and static power consumption low merit. However, there are also some shortcomings, such as asymmetric read and write performance, limited write times and high write power consumption. Its emergence has brought great new opportunities and challenges to the storage field, and has triggered a research boom in the industry and academia on heterogeneous hybrid memory architecture and related system software. Non-volatile memory has many new implications for computer system architecture, system software, software libraries, and appli...

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Problems solved by technology

[0005] For this reason, an object of the present invention is to propose a kind of multi-thread persistence B+ tree data structure design and implementation method, this method uses the mixed main memory data structure of non-volatile memory and volatile memory, increases the concurrency of data retrieval and achieve data persistent storage, solve the problem of enlarged lock overhead, and speed up the system recovery process of data structures

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