DMA device for nodes in multi-computer system and communication method

Abstract

The invention relates to a DMA device for nodes in a multi-computer system and a communication method. The method comprises that: step 1, a local node generates DMA command according to an application program, a descriptor of the DMA command is stored in a memory, and a door bell comprising descriptor memory position information of the DMA command is transmitted to the local node; step 2, the local node reads the descriptor according to the door bell, and an information generating network packet in the descriptor is transmitted to an interconnecting network and generates a transmission completion event or only generates a transmission completion event; and step 3, the DMA device of a remote node receives the network packet from the interconnecting network, and stores the data of the network packet according to the type of the network packet and generates a receiving completion event, or only generates a receiving completion event, or fills the data of the remote node into the network packet and sends the data to the local node. The device and the method can provide information transmission modes of the nodes in the multi-computer system, and simultaneously ensures the efficient communication of the multi-computer system.

Description

technical field [0001] The invention relates to the field of DMA (Direct Memory Access, direct memory access), in particular to a DMA device and a communication method of a node in a multi-computer system. Background technique [0002] In a multi-computer system, data exchange is often required between arbitrary nodes, so the performance of data exchange will affect the performance of communication. Flexible and efficient copying of data from the memory of one node to the memory of another node can provide powerful communication capabilities for multi-computer systems. Direct processing of memory data access by the processor will bring huge processor overhead, and DMA technology can prevent the processor from wasting processing power in simple and repetitive memory read and write operations. Therefore, when communicating between nodes of a multi-computer system DMA technology will also be used. The specialized hardware that implements the DMA technique is called a DMA devi...

AI Technical Summary

Problems solved by technology

However, when the processor reads the memory, the computing components in the processor will be idle for a long time, thus causing a waste of computing power of the processor.

Similarly, when the processor writes to the memory, the computing components in the processor will also be idle for a long time, resulting in a waste of computing power of the processor

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