[Owlim-discussion] Evaluation of query time

[Buddy Rich]

Hi, I am assessing the performance of SwiftOWLIM and I have three questions:

1) It seems to me that the query time when the repository is not yet "built" is 
slower than when the repository is ready. Is it an accident?

2) It seems to me that if I repeat the same kind of query for very similar 
nodes during the same execution, the performances improve a lot (e.g. from 400 
ms to 100 ms).
In other words, How should I carry out the assessment?
One query at a time or I can execute more queries at the same time?

3) I have a query like this:

prefix skos:  <http://www.w3.org/2004/02/skos/core#>

SELECT Distinct ?IdRelDoc
WHERE
{
    ?IdDescendant skos:broaderTransitive <http://www.ex.it/concept#207>.
    ?idDescendant skos:related ?IdRelConcept.
    ?IdRelDoc skos:subject ?IdRelConcept.
}

Is it plausible that from an ontology with ~4M statements to one with ~10M, the 
performances increase from 234 ms (for 10k results) to 70k ms (for 26k results)?

Thank you in advance!


      

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