Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!ginosko!uunet!bywater!acheron!archet!wlm
From: wlm@archet.UUCP (William L. Moran Jr.)
Newsgroups: comp.sys.ibm.pc.rt
Subject: Re: AFPA performance
Message-ID: <263@archet.UUCP>
Date: 24 Jul 89 06:58:03 GMT
References: <12926@bloom-beacon.MIT.EDU>
Reply-To: wlm@archet.UUCP (William L. Moran Jr.)
Organization: A Desperate and Dedicated Crew
Lines: 26

In article <12926@bloom-beacon.MIT.EDU> dyer@arktouros.mit.edu (Steve Dyer) writes:
>I'd like to get a feeling for the magnitude of floating point
>performance increase by adding the AFPA board to a model 125
>running the Sep or Dec 88 release of AOS 4.3.
>

I hate to say this, but my experience is that the eafpa (enhanced
advanced ... :) is not a real big win over the regular 125 - mc68881
I've seldom seen performance more than 20% better on pure floating
point stuff on a 135 with eafpa vs. 125 with no fpa just a mc881. I
suspect this may have something to do with the compiler as I've heard
that AIX does much better than this. Anyway, rumors I've heard say
that for AOS, the afpa may actually do worse than the mc881, although
I don't have an afpa to test this with.

				Bill Moran



-- 
arpa: moran-william@cs.yale.edu or wlm@ibm.com
uucp: uunet!bywater!acheron!archet!wlm or decvax!yale!moran-william
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