基于RDMA的区块传输机制设计与实现

Design and implementation of block transmission mechanism based on remote direct memory access

随着区块链技术的不断发展,区块的传输延迟成为区块链系统可扩展性的性能瓶颈。远程直接内存访问(RDMA)技术能够支持高带宽和低时延的数据传输,为低延迟区块传输提供了新的思路。因此,结合RDMA原语的特性,设计了用于区块信息共享的区块目录结构,并在此基础上设计并实现了区块传输的基本工作过程。实验结果表明,相较于基于TCP的方案,在1 MB大小的区块上基于RDMA的区块传输机制将节点间的区块传输延迟降低了44%,全网络的区块传输延迟降低了24.4%,在10000节点规模的区块链上,区块链发生临时分叉的数量降低了22.6%。可见,基于RDMA的区块传输机制充分发挥了高速网络的性能优势,降低了区块传输延迟及临时分叉的数量,提高了现有区块链系统的可扩展性。

With the continuous development of blockchain technology,the block transmission delay has become a performance bottleneck of the scalability of the blockchain system.Remote Direct Memory Access(RDMA)technology,which supports high-bandwidth and low-delay data transmission,provides a new idea for block transmission with low latency.Therefore,a block catalogue structure for block information sharing was designed based on the characteristics of RDMA primitives,and the basic working process of block transmission was proposed and implemented on this basis.Experimental results show that compared with TCP(Transmission Control Protocol)transmission mechanism,the RDMAbased block transmission mechanism reduces the transmission delay between nodes by 44%,the transmission delay among the whole network by 24.4%on a block of 1 MB size,and the number of temporary forks appeared in blockchain by 22.6% on a blockchain of 10000 nodes.It can be seen that the RDMA-based block transmission mechanism takes advantage of the performance of high speed networks,reduces block transmission latency and the number of temporary forks,thereby improving the scalability of the existing blockchain systems.