Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewse!cbnewsd!tracy
From: tracy@cbnewsd.att.com (kim.tracy)
Newsgroups: comp.lang.prolog
Subject: ESL Memory Problems?
Keywords: MS/DOS Prolog Expert_Systems_Ltd garbage_collection
Message-ID: <1991Apr9.163312.29082@cbnewsd.att.com>
Date: 9 Apr 91 16:33:12 GMT
Organization: AT&T Bell Laboratories
Lines: 23


I've been using Expert Systems Ltd's MS/DOS Prolog-2 public domain
interpreter for a class that I've been teaching and one of my
students ran across the following problem:

	The Prolog-2 interpreter will run out of space and not
	be able to fully recover.  Even exiting (halting) Prolog-2
	and rerunning Prolog-2 does not clean up the system and
	it will immediately run out of memory when the debugger
	is again started up.  The problem disappears when MS/DOS
	is reset and the program will run fine.  It appears that 
	Prolog-2 is not properly reinitializing and maintaining
	some memory-resident data structure.

Any further information on this problem (or a fix!) would be
greatly appreciated.  

	Thanks,

	--Kim Tracy, 708-979-4164
	AT&T Bell Laboratories & Illinois Institute of Technology
	..!att!ihlpz!tracy