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Sensors 2018, 18(1), 28;

GTSO: Global Trace Synchronization and Ordering Mechanism for Wireless Sensor Network Monitoring Platforms

ITACA, Universitat Politècnica de València, Camino de Vera, s/n, 46022 Valencia, España
Carrera de Computación, Escuela Superior Politécnica Agropecuaria de Manabí (ESPAM MFL), 10 de Agosto and Granda Centeno Street, No. 82, 130601 Calceta, Manabí, Ecuador
Author to whom correspondence should be addressed.
Received: 21 November 2017 / Revised: 21 December 2017 / Accepted: 21 December 2017 / Published: 23 December 2017
(This article belongs to the Special Issue Dependable Monitoring in Wireless Sensor Networks)
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Monitoring is one of the best ways to evaluate the behavior of computer systems. When the monitored system is a distributed system—such as a wireless sensor network (WSN)—the monitoring operation must also be distributed, providing a distributed trace for further analysis. The temporal sequence of occurrence of the events registered by the distributed monitoring platform (DMP) must be correctly established to provide cause-effect relationships between them, so the logs obtained in different monitor nodes must be synchronized. Many of synchronization mechanisms applied to DMPs consist in adjusting the internal clocks of the nodes to the same value as a reference time. However, these mechanisms can create an incoherent event sequence. This article presents a new method to achieve global synchronization of the traces obtained in a DMP. It is based on periodic synchronization signals that are received by the monitor nodes and logged along with the recorded events. This mechanism processes all traces and generates a global post-synchronized trace by scaling all times registered proportionally according with the synchronization signals. It is intended to be a simple but efficient offline mechanism. Its application in a WSN-DMP demonstrates that it guarantees a correct ordering of the events, avoiding the aforementioned issues. View Full-Text
Keywords: traces synchronization; offline synchronization; monitoring platforms traces synchronization; offline synchronization; monitoring platforms

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Navia, M.; Campelo, J.C.; Bonastre, A.; Ors, R. GTSO: Global Trace Synchronization and Ordering Mechanism for Wireless Sensor Network Monitoring Platforms. Sensors 2018, 18, 28.

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