Path: utzoo!mnetor!uunet!husc6!bloom-beacon!gatech!purdue!i.cc.purdue.edu!j.cc.purdue.edu!pur-ee!uiucdcs!uxc.cso.uiuc.edu!urbsdc!jwilson
From: jwilson@urbsdc.Urbana.Gould.COM
Newsgroups: comp.sys.amiga.tech
Subject: Guru 0000002f ??
Message-ID: <45300001@urbsdc>
Date: 4 May 88 22:38:00 GMT
Lines: 39
Nf-ID: #N:urbsdc:45300001:000:1657
Nf-From: urbsdc.Urbana.Gould.COM!jwilson    May  4 17:38:00 1988






I got a very starange Guru the other day.  I was running a simulation that does
a ton of floating point calculcations.  I cannot use the Motorolla FFP format,
because I need numbers larger than 10^18.  So, I was using IEEE double precision
snail floating point.  I use Manx C v3.6.  I have an Amy 500 with 1MB
( orig 512K + Commodore 512K internal).  The simulation had been running fine
for about 3.5 hours ( I said it did a ton of calculations), it had produced 
~400K of data in a RAM: disk.  (I knew I should have run it to floppy) It was 
nearly finished ( I'm not sure, but it might have been at the end when it 
crashed), when it suddenly flashed the famous Software Failure requester.

The Guru was:

     0000002f.00Cxxxxx   (I'm not sure of the address right now, but it was in
			  fast ram -- where the program was running.)

I have never seen a CPU Trap of 2f before, and I don't have any source that
lists that number.  WHAT HAPPENED??!?  I dont want to waste another 4.5 hours of
CPU time to have it crash again, unless I can find out what's wrong.

I have successfully run this program using the FFP format with data that was 
smaller, but I was trying to do a larger simulation.

Any help I can get from anyone would be appreciated.

Jeff Wilson
jwilson@urbsdc
!uiucuxc!urbsdc!jwilson
********************************************************************************
working for, but in no way representing:

                 Gould CSD-Software Division, Urbana, IL

and occasionally The University of Illinois (although I pay them instead of vise versa.)
********************************************************************************