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Abstract. An implementation of persistent object store for real-time systems with strict processing time constraints is a challenging task, because many traditional database techniques, e.g. transaction management schemes, are not applicable for such systems. This paper examines technical and business requirements for one particular class of such systems and describes an architecture based on distributed shared virtual memory. The major contributions are: use of distributed dynamic hashing to achieve load balancing and tight coupling of transaction and virtual memory management, which allows local scheduling of read-only transactions.

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The development of efficient distributed service systems places particular demands on interaction testing methods. It is required to consider not only the work of individual components at each stage of development but also their interaction as a system. Often, such testing is performed directly at the time of publishing the application with end-users. In this paper, we consider methods of emulating and testing distributed systems on limited resources available to individual developers. What to do with factors beyond the scope of tests of one application? How would the system behave when the network is unstable, and the third-party service does not work correctly? In this work, we present a new tool created to simulate the operation of a full-fledged service system and failure of its specific elements. The main feature of the solution we created is in the provision of abstraction for the developer, which does not require a deep understanding of the work of network infrastructures. It allows us to compare the work of several distributed applications under the same conditions, check the stability of the programme regarding the unstable operation of network elements, study the influence of the network structure on the of services behaviour and detect their vulnerabilities associated with interservice interaction.