As part of the recent conversation on benchmarking RDF stores, we re-ran the LUBM 8000 load test (1067 million triples) with the current Virtuoso.
We did it on two different machines, one with 2 Xeon 5130 2Ghz and 8G RAM and one with 2 Xeon 5330 2GHZ and 16G RAM. Both had 6 x 7800 rpm SATA-2 drives. The load rate on the 16G configuration was 36.8 Ktriples per second. The load rate on the 8G configuration was 29.7 Ktriples per second. Both loads were made using 6 concurrent load streams. Some small changes to the numbers may be released later as a result of changing tuning.
The Virtuoso version was 5.0, in the update to be released on the week of Dec 10, 2007. This is an incremental release of Virtuoso 5.0 and has the same engine as the prior 5.0s, with some optimizations for RDF loading and diverse bug fixes, notably in RDF mapping of relational data. This release will be further described in a separate post.
The load does not include forward chaining but then Virtuoso supports sub-class and sub-property without materializing the entailed triples.
Most of the LUBM entailed triples represent sub-classes and sub-properties. The LUBM query and forward chaining side deserves a separate treatment but this is for another time.
Most recent posts on this blog refer to Virtuoso 6, which is presently under development. We will publish results with the 6.0 engine later. Also, further enhancements to triple store performance will take place on the Virtuoso 6 platform.