A primary goal of AOSD in the context of systems software has been
to permit improved modularity without significantly degrading performance.
Optimizations represent important crosscutting concerns in this context but
also a significant challenge due to their fine-grained nature. This paper
investigates how well the current state-of-the-art in AOSD can support such
optimization aspects, via a case study involving an optimized network
simulator, IP-TN. Duplication of optimizations achieved via low-level
modifications to IP-TN in C++ have been attempted via aspectization of those
optimizations in AspectC++. While comparable run-time performance is achieved
with AspectC++ and (un)pluggability is clearly simpler, the effects on
comprehensibility are less clear.
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