jwilson@urbsdc.Urbana.Gould.COM (05/05/88)
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.)
********************************************************************************page@swan.ulowell.edu (Bob Page) (05/06/88)
Description Guru Number ------------------- ----------- Bus Error 00000002 Address Error 00000003 Illegal Instruction 00000004 Divide by Zero 00000005 CHK instruction 00000006 TRAPV (Overflow) 00000007 Priviledge Violation 00000008 Instruction Trace 00000009 Line A Emulation 0000000A Line F Emulation 0000000B TRAP 0 ... 15 00000020 ... 0000002F ..Bob -- Bob Page, U of Lowell CS Dept. page@swan.ulowell.edu ulowell!page