AQUASUN: adaptive window query processing in CAD applications for physical design and verification

  • Authors:

  • Michiel De Wilde;Dirk Stroobandt;Jan Van Campenhout

  • Affiliations:

  • Ghent University, Gent, Belgium;Ghent University, Gent, Belgium;Ghent University, Gent, Belgium

  • Venue:
  • Proceedings of the 12th ACM Great Lakes symposium on VLSI
  • Year:
  • 2002

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Abstract

CAD applications for physical design and verification very often require enumerating all layout objects whose bounding box intersects an axis-aligned rectangular area. A number of multidimensional access methods exist to process such window queries. The performance of some important design and verification algorithms heavily depends on the processing speed of the used access method. For complex layouts, these methods require huge amounts of resident memory to attain this speed.In this paper, we present a new access method called AQUASUN, which brings a significant query processing performance improvement over other adaptive methods---methods which can cope with a continuously changing layout. These methods generally descend from the database world and are designed to perform the equivalent query in n-dimensional space. Our method is specifically tailored to two dimensions, exploiting 2D optimisations that significantly accelerate window queries within oblong objects like PCB tracks. Furthermore, AQUASUN makes use of an efficient compression technique which greatly cuts down on memory usage.