Thursday, May 25, 2006

Why have millions of triples? When you can have billions.

Big news, literally, with BigOWLIM. "BigOWLIM is a high-performance semantic repository, implemented in Java and packaged as a Storage and Inference Layer (SAIL) for the Sesame RDF database. BigOWLIM uses the TRREE engine to perform RDFS, OWL DLP, and OWL Horst reasoning, based on forward-chaining of entailment rules. The most expressive language supported is a combination of limited OWL Lite and unconstrained RDFS. BigOWLIM can manage billions of explicit statements on server hardware. A principle limitation of BigOWLIM is the relatively slow delete operation. The upload, reasoning, and the query evaluation proceed fast even against huge ontologies and datasets."

"BigOWLIM successfully passed the threshold of 1 billion (10^9) statements of OWL/RDF – it loaded an 8000-university dataset of the LUBM benchmark and answered the evaluation queries correctly. Evaluation setup and statistics:

BigOWLIM successfully passed the threshold of 1 billion (10^9) statements of OWL/RDF –
it loaded an 8000-university dataset of the LUBM benchmark and answered the evaluation queries correctly. Evaluation setup and statistics:

  • Hardware: 2 x Opteron 270, 16GB of RAM, RAID 10; assembly cost < 5000 EURO
  • OS: Suse 10.0 Linux, x86_64, Kernel 2.6.13-15-smp; 64-bit JDK 1.5 -Xmx12000m
  • Loading, inference, and storage took 69 hours and 51 min
  • LUBM(8000,0) contains 1.06 billions of explicit statements

    • The "inferred closure" contains about 786M statements
    • BigOWLIM had to manage over 1.85 billions of statements in total
    • These figures indicate that, if used as a plain-RDF repository, BigOWLIM can easily handle around 2 billion statements on the same hardware setup

  • 92GB RDF/XML files; 95 GB binary storage files
  • Average Speed: 4 538 statements/sec."


While not available for download, a scaled down version, OWLIM is.

Hot on the heals of recent postings, Scalability of the Semantic Web and performance, triplestores, and going round in circles...
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