Experimental Software Systems: ISAC: Integrated System Support for Adaptive Communication and Computation Control in Clustered Environments

Grama, Ananth Y. Park， Kihong普渡大学ESS: ISAC：集群环境中自适应通信和计算控制的集成系统支持该项目旨在为集群计算环境中的应用程序开发建立一个集成软件系统（ISAC）。ISAC解决通信控制和负载平衡问题，以促进有效的并行平台。与传统方法相比，ISAC将通信和计算控制看作一个集成系统。它动态调度计算和通信，利用它们的重复特性来实现最佳性能。通过联合调度通信和计算的组通信机制增强了端到端拥塞控制。调度是在假定资源在应用程序池中共享的最佳网络环境中执行的。通信控制是自适应的，调度是根据网络状态动态执行的。假设路由器实现某种形式的加权公平排队，其中资源保留可能受到影响，ISAC使用某种形式的准入控制实现每个连接或每个多播组的保证带宽通道。与主机站的进程调度支持相结合，这允许关键应用程序在不受网络和处理器负载影响的情况下实现有保证的进度。它还允许应用程序透明地处理主机和网络环境之间的异构性。ISAC将显著提高从科学计算到分布式网络和数据库服务器的集群计算应用程序的可编程性和性能。

EIA-9806741 Grama, Ananth Y. Park, Kihong Purdue University ESS: ISAC: Integrated System Support for Adaptive Communication and Computation Control in Clustered Environments This project aims to build an integrated software system (ISAC) for application development in cluster-computing environments. ISAC addresses issues of communication control and load balancing to facilitate an effective parallel platform. In contrast to traditional approaches, ISAC views communication and computation control in an integrated system. It dynamically schedules computation and communication making use of their repetitive nature to achieve optimal performance. End-to-end congestion control is augmented by a group communication mechanism that conjointly schedules communication and computation. Scheduling is carried out assuming a best-effort network environment in which resources are shared among a pool of applications. Communication control is adaptive, and scheduling is performed dynamically as a function of network state. Assuming that routers implement a form of weighted fair queuing wherein resource reservations can be affected, ISAC implements guaranteed-bandwidth channels either per-connection or per-multicast group using a form of admission control. In conjunction with process scheduling support at host stations, this allows critical applications to achieve guaranteed progress impervious to network and processor loads. It also allows applications to deal with heterogeneity among hosts and networking environments transparently. ISAC will significantly enhance the programmability and performance of cluster-computing applications ranging from scientific computing to distributed web and database servers.