一种具有时间约束的分布式软件可靠性评估方法

在对分布式软件的可靠性进行评估时，通常采用以分布式程序为基础建立的相应模型，然而这些模型侧重于分布式软件的可靠性，很少反映具有时间约束特征的可靠性特性，以分布式软件的可靠性模型为基础，将精简和广度优先两种方法有机结合，对文件生成树中的数据文件传输时间进行评测，确定文件生成树的状态，从而提出一种具有实时特征的分布式软件可靠性评估方法。

A Reliability Evaluation of Time-Constrained Distributed Software

When evaluating distributed software reliability, the model based-on respective distributed program is often used. However, current reliability models can only be used for distributed program evaluation and can not reflect the effects of real-time constraints. Proposed in this paper is an approach for the reliability evaluation of distributed programs that addresses real-time constraints. The approach proposed here is based on the principle of distributed program reliability evaluation, namely combining reduction with breadth-first manner, and then the transmission time is evaluated to find the time needed to complete execution of the file spanning tree for a given program. If the transmission time of a file spanning tree exceeds the execution deadline, it is unsuccessful whereas a file spanning tree is operational. A simple distributed real-time system is used to illustrate the feasibility of the proposed approach.