Modeling the Global Critical Path in Concurrent Systems

 

Carnegie Mellon University Technical Report No. CMU-CS-06-144

Girish Venkataramani, Tiberiu Chelcea, Mihai Budiu, and Seth Copen Goldstein

August, 2006

Abstract


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@techreport{venkataramani-tr06,
  author = {Venkataramani, Girish and Chelcea, Tiberiu and Budiu,
     Mihai and Goldstein, Seth Copen},
  title = {Modeling the Global Critical Path in Concurrent Systems},
  institution = {Carnegie Mellon University},
  year = {2006},
  number = {CMU-CS-06-144},
  month = {August},
  abstract = {We show how the global critical path can be used as a
     practical tool for understanding, optimizing and summarizing the
     behavior of highly concurrent self-timed circuits. Traditionally,
     critical path analysis has been applied to DAGs, and thus was
     constrained to combinatorial sub-circuits. We formally define the
     global critical path (GCP) and show how it can be constructed
     using only local information that is automatically derived
     directly from the circuit. We introduce a form of Production
     Rules, which can accurately determine the GCP for a given input
     vector, even for modules which exhibit choice and early
     termination. \par The GCP provides valuable insight into the
     control behavior of the application, which help in formulating
     new optimizations and re-formulating existing ones to use the GCP
     knowledge. We have constructed a fully automated framework for
     GCP detection and analysis, and have incorporated this framework
     into a high-level synthesis tool-chain. We demonstrate the
     effectiveness of the GCP framework by re-formulating two
     traditional CAD optimizations to use the GCP, yielding efficient
     algorithms which improve circuit power (by up to 9\%) and
     performance (by up to 60\%) in our experiments.},
  keywords = {Asychronous Circuits, Spatial Computing,CAD, Global
     Critical Path},
  url = {http://www.cs.cmu.edu/~seth/papers/venkataramani-tr06.pdf}
}

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