Håvard is a software developer specializing on the semantic web stack and an avid contributor to Eclipse RDF4J. Among his contributions are a new RDFS reasoner that is up to 80x faster than the previous one ,adjustments to the SPIN implementation to make it between 10x and 1000x faster and overall adjustments to the code to make things faster and leaner.

Profiling and benchmarking are a key and important way to understand how to improve code. JMH is a great tool for benchmarking and JFR equally great for profiling, these are coincidentally Håvard’s favourite tools.

Currently Håvard is working on a SHACL implementation for RDF4J. There are naturally a few other SHACL implementations written for other libraries, however none of them are aimed at transactional workloads in a typical user-facing, database driven, application. For these transactional workloads RDF4J ShaclSail (the SHACL implementation) is up to 5000x faster than open source alternatives and 50x faster than commercial offerings.

All in his spare time, evenings, weekends and holidays.

Support Håvard in his quest to make semantic web faster and leaner by becoming a GitHub Sponsor!