Hello all,

Someone made a benchmark on github to compare performance of different
languages on a simple pathfinding problem:

https://github.com/logicchains/LPATHBench/blob/master/writeup.md

It's getting popular and people are quoting the results they get from
it to show that a language is really fast. Factor wasn't represented
to I wrote an implementation of the algorithm here:

https://github.com/bjourne/playground-factor/blob/master/lpath/lpath.factor

Performance is pretty good I think. Factor runs in ~1340 ms while the
Java version runs in ~1030 ms on my machine. And it wasn't that hard
to get that speed -- you just replace safe generic words like nth with
unsafe specialized ones like array-nth. Though I wonder if anyone has
any ideas on how to make the Factor code run even faster?

One idea I toyed with was making a non-recursive variant of the
(longest-path) word. Right now it is co-recursive, (longest-path)
calls ((longest-path)) which calls (longest-path). I think that if you
can get rid of the co-recursion it would easily become as fast as the
Java version.


-- 
mvh/best regards Björn Lindqvist

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