Click on the title to obtain a gzip-ed PostScript version of the paper (85K).
We treat two important issues in heap garbage collection for
WAM-based Prolog systems. First we describe a new method for
preserving the order of heap segments in a copying garbage
collector. Second, we deal with methods for (multi-)generational
garbage collection; in particular we show the importance of precise
maintenance of generation lines and propose different and novel ways
for its implementation. All the methods are experimentally evaluated.