Performance Modeling and Benchmarking of Event-Based ... - DVS

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44 CHAPTER 4. PERFORMANCE ENGINEERING OF EVENT-BASED SYSTEMS Name Pattern 1: Standard Queue Pattern 2: Standard Pub / Sub - Fixed Number of Subscribers Pattern 3: Standard Pub / Sub - Configurable Number of Subscribers Pattern 4: Time controlled Pull I Pattern 5: Time controlled Pull II Pattern 6: Resource controlled Pull I Pattern 7: Resource controlled Pull II Pattern 8: Time Window Pattern 9: Random Load Balancer Pattern 10: Round- Robin Load Balancer Pattern 11: Queuing Load Balancer Description Models a queue, which pushes notifications to the consumer. Models a standard publish / subscribe scenario, in which incoming notifications are pushed to a constant number of subscribers. A standard publish / subscribe scenario, in which incoming notifications are pushed to a variable number of subscribers. Implementation of simple time-controlled pull communication. An event consumer connects frequently to pull one event. An event consumer connects frequently to the broker to pull all waiting event notifications. An event consumer pulls an event and processes it. When the event is processed, the consumer pulls the next event. Similar to Pattern 6, but a different implementation for parallel event processing. A consumer connects frequently to a broker and stays online for a specified time interval before disconnecting. A load balancer which distributes incoming event notifications randomly among the consumers. A load balancer which distributes incoming event notifications round-robin among the consumers. A load balancer stores incoming event notifications and consumers pull events for processing them. Table 4.1: Performance Modeling Patterns 4. QPN Definition: The definition of the QPN is presented in four tables: (a) Places: A list of all places including the name, type (Q=queueing place, O=ordinary place, S=subnet place) and a short description. (b) Colors: A list of all colors. (c) Initial Number of Colors: Specifies, how many tokens of which color in which place are generated in the initial phase of a QPN. (d) Transitions: A description of all transitions including colors, places and firing weight (FW, mostly 1 or ∞ ). Additionally, a graphical illustration of the underlying QPN is provided for each pattern. If no cardinality for a transition is specified in the illustration, the cardinality is 1.
4.2. PERFORMANCE MODELING PATTERN 45 Pattern 1: Standard Queue 1‘Event 1‘Event 1‘Event 1‘Event Producer T1 Queue T2 Consumers Figure 4.7: Standard Queue Pattern Characteristics • 1 : 1 communication • Push-based Example A customer sends an order message to a component for “incoming orders”. All incoming orders are first stored by a queue of a message-oriented middleware and afterwards delivered to the order-processing application. Description The standard queue pattern is a simple example for modeling asynchronous point-to-point messaging: An event is sent by its producer to the queue. After the queue processed the event, the event is forwarded (pushed 1 ) to exactly one consumer. QPN Definition Places: Place Type Description Producer S Publishes events. Queue Q Queue for incoming events. Consumer S Consumes events. Colors: Color Event Description Represents the event notification. Transitions: Id Input Output FW Description T1 1 Event ( P roducer) 1 Event (Queue) 1 Prod. publishes event. T2 1 Event (Queue) 1 Event (Consumer) 1 Forwarding of events of the Consumer. 1 A support for push-based communication using queues is, e.g., part of the JMS specification.
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5.4. CASE STUDY II: JMS2009-PS 115
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Bibliography [1] J. Abbott, K. B. M
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BIBLIOGRAPHY 153 [197] K. Sachs, S.
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BIBLIOGRAPHY 155 [228] P. Tran, P.
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