8.4 Unloading Perl

Playing with Perl is nice, but this also means that both XSB and the Perl interpreter are loaded in the main memory. If you do not need Perl for some time and memory is at premium, you can unload the Perl interpreter:

:- unload_perl.

This predicate always succeeds. If you need Perl matching features later, you can always come back to it: it is loaded automatically each time you use a pattern matching or a string substitution predicate.