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Varying the query staleness in TP-Grid - PowerPoint PPT Presentation

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Darius Š idlauskas Aarhus University. Christian S. Jensen Aarhus University. Simonas Š altenis Aalborg University. Processing of Extreme Moving-Object Update and Query Workloads in Main Memory. Main Data Structures. Semantics. Timeslice. Freshness. Two-phase switching in TP-Grid.

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Varying the query staleness in tp grid

Darius ŠidlauskasAarhus University

Christian S. JensenAarhus University

Simonas ŠaltenisAalborg University

Processing of Extreme Moving-Object Update and Query Workloads in Main Memory

Main Data Structures




Two-phase switching in TP-Grid


Query Results


  • Includes four diverse multi-core platforms

  • Studies eight grid-based index variants

  • Exercises the indexes under massive workloads containing tens of millions of moving vehicles simulated in a road network of Germany

  • All figures show results obtained on a 16-core Intel E5-2670 machine with 32 hardware threads in total

Optimal Grid Cell Size

Multi-threaded Scalability

Varying the query staleness in TwinGrid

Varying the query staleness in TP-Grid

Results from a micro-benchmark that measures CPU Cycles per 128-bit read/write using different synchronization methods.

Varying T0

Varying RQ Size

Varying #objects

Varying U/Q Ratio

MADALGO – Center for Massive Data Algorithmics, a Center of the Danish National Research Foundation