REACTION 2012. 1st International workshop on Real-time and distributed computing in emerging applications. December 4th, 2012, San Juan, Puerto Rico.Timely reconfiguration in distributed real-time
systems is a complex problem with many sides to it ranging
from system-wide concerns down to the intrinsic non-robust
nature of the specific middleware software and the used
programming techniques. In an completely open distributed
system, it is not possible to achieve time-deterministic
functional reconfiguration; the set of possible target
configurations that the system can transition to could be
extremely large threatening the temporal predictability of the
reconfiguration process. Therefore, a set of bounds and
limitations to the structure of systems and to their open nature
need to be imposed. In this paper, we present the different
sides of the problem of reconfiguration. We provide a solution
for timely reconfiguration based on reducing the solution space
of solutions of partially closed applications; we have enhanced
the logic of a middleware for distributed soft real-time
applications with the proposed technique. As a result,
applications require a limited number of schedulability tests to
search for the valid target configuration. We present some
results on the actual reduction of the configuration space
achieved by our middleware.This work has been partly supported by the iLAND project (ARTEMISJU
100026) funded by the ARTEMIS JTU Call 1 and the Spanish Ministry
of Industry (www.iland-artemis.org), ARTISTDesign NoE (IST-2007-
214373) of the EU 7th Framework Programme, and by the Spanish national
project REM4VSS (TIN 2011-28339)
