Automated and transparent model fragmentation for persisting large models

  • Authors:

  • Markus Scheidgen;Anatolij Zubow;Joachim Fischer;Thomas H. Kolbe

  • Affiliations:

  • Department of Computer Science, Humboldt Universität zu Berlin, Germany;Department of Computer Science, Humboldt Universität zu Berlin, Germany;Department of Computer Science, Humboldt Universität zu Berlin, Germany;Institute for Geodesy and Geoinformation Science, Technical University Berlin, Germany

  • Venue:
  • MODELS'12 Proceedings of the 15th international conference on Model Driven Engineering Languages and Systems
  • Year:
  • 2012

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Abstract

Existing model persistence frameworks either store models as a whole or object by object. Since most modeling tasks work with larger aggregates of a model, existing persistence frameworks either load too many objects or access many objects individually. We propose to persist a model broken into larger fragments. First, we assess the size of large models and describe typical usage patterns to show that most applications work with aggregates of model objects. Secondly, we provide an analytical framework to assess execution time gains for partially loading models fragmented with different granularity. Thirdly, we propose meta-model-based fragmentation that we implemented in an EMF based framework. Fourthly, we analyze our approach in comparison to other persistence frameworks based on four common modeling tasks: create/modify, traverse, query, and partial loads. We show that there is no generally optimal fragmentation, that fragmentation can be achieved automatically and transparently, and that fragmentation provides considerable performance gains.