By John Murphy (auth.), Nigel Thomas (eds.)
This booklet constitutes the refereed lawsuits of the eighth ecu functionality Engineering Workshop, EPEW 2011, held within the English Lake District in October 2011.
The sixteen normal papers and six poster shows papers offered including 2 invited talks have been conscientiously reviewed and chosen from a number of submissions. The papers are equipped in topical sections on performance-oriented layout and research equipment, version checking and validation, simulation concepts and experimental layout, performability modelling and function and tool intake tradeoffs.
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Additional info for Computer Performance Engineering: 8th European Performance Engineering Workshop, EPEW 2011, Borrowdale, UK, October 12-13, 2011. Proceedings
CsmMatrix[ni ][k]},5) end if end for return synchMarking Whenever synchronisation is detected involving the processing of customers at Pi , the corresponding service time samples of those customers need to be adjusted to take into account the proportion of time during which the synchronisation condition(s) are satisﬁed. This is because we assume that service only progresses when the synchronisation condition(s) are met. 2 Synchronisation Representation in Our Models After synchronisation between service areas is detected, it needs to be incorporated into the GSPN performance model that is constructed during stage four of the data processing pipeline.
Web server responses return from the web server cloud and arrive to the clients after going through the system. For our purposes, web traﬃc requests are negligible and the analysis is focused only in web traﬃc responses. The incoming synthetic traﬃc has been generated by using HTTP PackMime , where the web traﬃc is modelled as stochastic models obtained from the traﬃc analysis of a real link. The web traﬃc intensity is modulated with the R parameter, that sets up the incoming traﬃc as new conn/s in the system.
These assumptions facilitate the conversion and were already used (mainly the ﬁrst 5 ones) in other related works, such as in . R. E. -M. Vincent Definition 4. Well-Formed BPMN Process Graph Let BG = (V, E, L, , p) be a BPMN Process graph, with V = S ∪ A ∪ G ∪ F . BG is a well-formed BPMN Process graph if and only if: – – – – – – – – – ∀v ∈ S, (| inputs(v)| = 0) ∧ (| outputs(v)| = 1) ∀v ∈ F , (| inputs(v)| = 1) ∧ (| outputs(v)| = 0) ∀v ∈ A, (| inputs(v)| = 1) ∧ (| outputs(v)| = 1) ∀v ∈ G, ( (v) = “ +”) ∨ ( (v) = “ ”) ∨ ( (v) = “ ×”) ∀v ∈ G, ((| inputs(v)| > 1) ∧ (| outputs(v)| = 1)) ∨ ((| inputs(v)| = 1) ∧ (| outputs(v)| > 1)) ∀v ∈ A ∪ G, ∃s ∈ S such that ∃ a path s v ∀v ∈ A ∪ G, ∃f ∈ F such that ∃ a path v f ∀v ∈ G such as ( (v) = “ ×”) ∨ ( (v) = “ ”), ∀w ∈ outputs(v), p((v, w)) must be defined p((v, w)) = 1 ∀v ∈ G such as (v) = “ ×”, w ∈ outputs(v) Therefore, a well-formed BPMN Process graph is a graph in which: – – – – – – – – a start event vertex can have only one output vertex and no input vertices; an end event vertex can have only one input vertex and no output vertices; an activity vertex can have only one input vertex and only one output vertex; each gateway vertex has one of the following labels: “ + ”, for a parallel gateway; “ ”, for an inclusive gateway; and “ × ”, for an exclusive gateway; a gateway vertex can perform a role of divergence or a role of convergence (but not the two roles at the same time).