分布式并行服務(wù)器中的高性能通信研究

基于快速以太局網(wǎng)中分布式并行服務(wù)器通信特點和對網(wǎng)絡(luò)協(xié)議棧的分析，設(shè)計并實現(xiàn)了一種分布式操作系統(tǒng)傳輸協(xié)議。該協(xié)議在維持通用編程接口的同時，精簡網(wǎng)絡(luò)協(xié)議棧底層的冗余操作，減少操作系統(tǒng)干預(yù)和協(xié)議自維護(hù)開銷。在8個節(jié)點的服務(wù)器系統(tǒng)上的測試結(jié)果表明，分布式操作系統(tǒng)傳輸協(xié)議獲得比用戶數(shù)據(jù)報協(xié)議更小的往返延遲和系統(tǒng)開銷，應(yīng)用環(huán)境下有約20%的增益，能有力地支持系統(tǒng)擴展和大并發(fā)訪問服務(wù)。Aiming at the characteristics of the LAN of fast Ethernet and distributed parallel server system, a novel distributed operating system transport protocol (DOSTP) is proposed in this paper. The goal of this work is to study how to reduce the communication software overheads in the distributed parallel server system with off-shelf equipments, moreover to keep the common programming interfaces. Several measurements, such as decreasing redundant operations at underlying protocol stack, reducing OS interventions and the overheads of protocol self-maintenance, are used to improve the performance. Experiments have been done on the server of 8 PIII PC nodes and 100Mbps Ethernet with switches. Compared with UDP/IP, DOSTP decreases round-trip time of 20% for 64 bytes packets under the same application conditions.