Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!blake!mtsu
From: mtsu@blake.acs.washington.edu (Montana State)
Newsgroups: comp.sys.dec
Subject: Fascinating DecStation 3100 Fortran problem.
Message-ID: <2227@blake.acs.washington.edu>
Date: 30 May 89 23:18:57 GMT
Reply-To: mtsu@blake.UUCP (Montana State)
Distribution: na
Organization: University of Washington, Seattle
Lines: 24

I have this very large Fortran program that I'm trying to get to work on a
Decstation 3100 (MIPS compiler version 1.0, and 1.31).  Two problems.

1)  If compiled with version 1 of the compiler, the program runs fast,
bug generates an output file that consists of NaN, which somebody told me
means not a number.  However, the exact same program works like a charm under
VMS.

2)  If I add a bunch of WRITE(*,*)'s to do  debugging, the program workks
fine, and even the data files stop havind the NAN' in them.

3)  the same program compiled under version 1.31 of the compiler runs
twice as slow as version one, while generateing identical output.  I've
tried all the -O? options, and nothing helps.


Again, the program works fine in VMS Fortran as is.

Any comments or suggestions??

replies to icsu6000@caesar.cs.montana.edu.


Thanx.