Remote file access method for distributed memory file system

Abstract

The invention discloses a remote file access method for a distributed memory file system. The remote file access method for the distributed memory file system comprises the steps that: a client computer sends a request for opening a remote memory file to a server computer; a server distributes a continuous virtual address space VA to a corresponding memory file, and establishes mapping from file data to the VA; the server sends the initial address of the virtual address space of the file to a client; the client calculates the virtual address of the memory file data of the server according to a remote file reading and writing request of a user; and the client directly accesses a physical memory corresponding to the virtual address of the server through network equipment, and reads and writes the remote memory file. According to the remote file access method for the distributed memory file system disclosed by the invention, when the remote memory file is read and written, the server sends the initial address of the virtual address space of the file to the client only for one time; then, when the client reads and writes the same file, the server does not need to send the address; therefore, the reading and writing performance of the remote memory file is greatly improved; furthermore, few server computing resources can be occupied; and little influence of a server load exists.

Description

technical field [0001] The present invention relates to the technical field of computer software, in particular to a method for efficiently accessing remote memory file data in a distributed memory file system by using a network technology (for example, RDMA) that can directly access the memory of a remote computer system in a distributed system or a remote system architecture . Background technique [0002] The full name of RDMA (Remote Direct Memory Access) technology is Remote Direct Memory Access. RDMA technology includes dedicated high-speed optical fibers, RDMA network cards, switches and network protocols. Multiple computers equipped with RDMA network cards can be connected through switches and high-speed optical fibers to form a data network. Computers in this network can directly access the memory of other computers through RDMA technology. To use RDMA technology for remote access to memory data between any two computers, you must first establish an appropriate R...

AI Technical Summary

Problems solved by technology

[0016] The disadvantages of method 1 are: 1) Each data read and write access needs to perform 4 RPC operations, and RPC is a time-consuming operation; 2) Each data read and write access needs to arouse the operating system of the server computer, occupying the service Computing resources of the end computer; 3) Every read and write access to data requires the server computer to create a buffer and copy the data to the buffer

However, if the user requests to access multiple pages, limited by the file organization method of the existing file system, the second method must decompose the access to the file data of multiple pages into multiple accesses to the file data of one page, and each access Request access to data for only one page

Since it is necessary to perform 4 RPC operations and evoke the operating system of the server computer every time the data of a page is accessed, the second method will also lead to high system resource overhead and low access performance to remote memory files with large amounts of data.

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