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From:	Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: What's with beta4?! Can you say s-l-o-w? I need help.
Date:	Tue, 09 Jan 1996 14:51:06 CST
Organization:	Rice University, Houston, Texas
Lines:	15
Message-ID:	<30f2d53a.sandmann@clio.rice.edu>
References:	<4cue6r$1a5 AT pith DOT uoregon DOT edu>
Reply-To:	sandmann AT clio DOT rice DOT edu
NNTP-Posting-Host:	clio.rice.edu
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

> Just last night I downloaded beta4, and recompiled my program with it.
> However, I was forced to switch back to beta3 because beta4 seems to
> produce unbearably slow code.  

This is almost certainly a byproduct of not upgrading CWSDPMI at the
same time.  Get beta 9.  Also check for whatever other zips you missed.

Why?  There is a flaw in the design of CWSDPMI beta 7 and earlier when
dealing with memory zones.  Each memory zone got it's own page directory.
DJGPP beta 4 uses a different memory zone for each sbrk(), so the memory
your program gets spread all over the place, and page faults page directories
like crazy.

Hey, all you beta 3 users, go ahead and upgrade CWSDPMI now, it won't hurt.  
But beta 4 will run slow and run out of VM if you don't!

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