Method and device for reading and writing processing of memory data

Abstract

The invention discloses a method and device for reading and writing memory data, relates to the technical field of computer systems, and solves the problem of wasting a lot of overhead on data request packets in the prior art when accessing memory data with a small amount of data , leading to the problem of low transmission efficiency. The method includes: the source node acquires each request packet to be sent; parsing the destination node identifiers of each request packet to be sent, and judging whether the destination node identifiers of each request packet to be sent are the same; At least two request packets to be sent are respectively used as sub-request packets and packaged into a merge request packet; the merge request packet is sent to the destination node corresponding to the destination node identifier, and the merge request packet is used to indicate the destination node Perform read and / or write operations on memory data of the destination node. The embodiment of the present invention is applied in the process of reading and writing memory data.

Description

technical field [0001] The invention relates to the technical field of computer systems, in particular to a method and device for reading and writing data in memory. Background technique [0002] In a multi-node computer system, the efficiency of data interaction between local and remote nodes directly affects the performance of the entire system. Remote direct memory access (Remote Direct Memory Access, RDMA) is to quickly move memory data from a system to remote system memory without any impact on the operating system, for example, without CPU intervention, memory data of a node It is directly transmitted to the physical memory of another node, thereby reducing the impact of data transmission on processing components and improving system performance. [0003] In RDMA read and write operations, the granularity of data exchange between memory and Cache (cache memory) is a Cache Line, with a size of 64Bytes (bytes) or 128Bytes. If the data of each Cache Line is packaged into...

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Problems solved by technology

[0003] In RDMA read and write operations, the granularity of data exchange between memory and Cache (cache memory) is a Cache Line, with a size of 64Bytes (bytes) or 128Bytes. If the data of each Cache Line is packaged into a request data There is a certain degree of link bandwidth waste in this small-scale data transmission. For example, the data packet header of PCIE (Peripheral Component Interface Express, fast peripheral interconnection standard) may have 16Bytes, and if the Payload (payload) length is 16Bytes, the utilization rate of link bandwidth is only 50%, so multiple remote data access operations with small data volume will waste more overhead on data request packets, resulting in low transmission efficiency

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