--- "Richard A. O'Keefe"
[snip]
The Prolog results at http://shootout.alioth.debian.org/ are only for the open source system SWI Prolog, which is basically a one-man effort. The commercial SICStus Prolog is substantially faster. Some of the Prolog benchmark versions look distinctly odd.
The commercial SICStus Prolog is also substantially more expensive (see http://www.sics.se/isl/sicstuswww/site/index.html), at 153 euros for a Personal License (see http://www.sics.se/isl/sicstuswww/site/order4.html). Prices for Academic, Single-User Commercial, and Multi-User Commercial licenses are even more expensive, at 1560, 1980, and 7800 euros, respectively. An Evaluation License is only valid for 30 days. Not all students and researchers can afford a Personal License. Can you recommend an alternative, fast Prolog development system under a free licensing agreement, such as GPL/GLPL? Benjamin L. Russell