Networked and Embedded Systems Laboratory

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<p> Detailed diagnostic data is a prerequisite for debugging problems
and understanding runtime performance in distributed wireless embedded
systems.  Severe bandwidth limitations, tight timing constraints, and
limited program text space hinder the application of standard diagnostic
tools within this domain.  This work introduces the Log Instrumentation
Specification (LIS), which provides a high level logging interface to
developers and is able to create extremely compact diagnostic logs.  LIS
uses a token scoping technique to aggressively compact identifiers that
are packed into bit aligned log buffers.  </p>

<p> LIS is evaluated in the context of recording call traces within a
network of wireless sensor nodes.  Our evaluation shows that logs
generated using LIS require less than 50\% of the bandwidth utilized by
alternate logging mechanisms.  Through microbenchmarking of a complete
LIS implementation for the TinyOS operating system, we demonstrate that
LIS can comfortably fit onto low-end embedded systems.  By significantly
reducing log bandwidth, LIS enables extraction of a more complete
picture of runtime behavior from distributed wireless embedded systems.
</p>

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