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| Content Provider | ACM Digital Library |
|---|---|
| Author | May, Johannes Bause, Falko Buchholz, Peter |
| Abstract | Quantitative aspects of modern IT systems are often specified by service level agreements (SLAs) which relate the maximal load of a system with guaranteed bounds for response times and delays. These quantities are specified for single services which are combined in a service oriented architecture (SOA) to composed services offered to potential users or other service providers. To derive SLAs for composed services and to plan the required capacity to guarantee SLAs, appropriate methods and tools have to be used that compute results based on information given in SLAs. In this paper it is argued that most available approaches are not sufficient to analyze systems based on SLA information. A new method and a tool are presented that support the efficient calculation of bounds for delays in composed systems based on bounds for the load and the delay of the individual components which are specified in the SLAs of the components. Furthermore, the presented tool can be used to generate bounds for the required processing capacity which a provider has to provide in order to guarantee the quality of service defined in the SLAs. The presented approach is in some sense a counterpart to mean value analysis for queueing networks but rather than mean values, worst case bounds for different quantities like response times or departure processes are computed. Analysis is based on min/+ algebra but the mathematical approach is hidden from the user by a graphical interface allowing a simple graphical specification and result representation for networks of composed services. |
| Starting Page | 233 |
| Ending Page | 244 |
| Page Count | 12 |
| File Format | |
| ISBN | 9781450344043 |
| DOI | 10.1145/3030207.3030215 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2017-04-17 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | Performance modeling tools Analytical evaluation Service level agreements |
| Content Type | Text |
| Resource Type | Article |
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