[daip] AIPS Y2K problem

[Joseph Lazio]

Hi, 

I'm trying to install 31DEC05 on the following system:

-> uname -a
Linux hood.nrl.navy.mil 2.4.22-1.2199.nptlsmp #1 SMP Wed Aug 4 11:48:29 EDT 2004 i686 i686 i386 GNU/Linux

-> gcc --version
2.95.3

-> g77 --version
GNU Fortran 0.5.25 20010315 (release)


I've run the Y2K LARGE and HUGE tests (in TMODE='M' mode).  In all
cases, the RMS number of correct bits is larger than the MAX number of
correct bits.  However, the number of correct MAX bits is sometimes
quite small.

Where do I start looking for the source of the problem?  Should I
upgrade the gcc and g77 versions to 3.2.x, is it something in the
optimization, ...?  Thanks in advance for any help.


Here's the number of correct bits for the LARGE test

-> grep BITS Y2K_LARGE.log 
AIPS 1: 'NUMBER CORRECT BITS MAX:'      12.7283573
AIPS 1: 'NUMBER CORRECT BITS RMS:'      15.5307283
AIPS 1: 'NUMBER CORRECT BITS MAX:'      14.2665386
AIPS 1: 'NUMBER CORRECT BITS RMS:'      16.5649376
AIPS 1: 'NUMBER CORRECT BITS MAX:'      12.2058344
AIPS 1: 'NUMBER CORRECT BITS RMS:'      16.5839443
AIPS 1: 'NUMBER CORRECT BITS MAX:'      15.3931131
AIPS 1: 'NUMBER CORRECT BITS RMS:'      22.8904324
AIPS 1: 'NUMBER CORRECT BITS MAX:'      10.8945446
AIPS 1: 'NUMBER CORRECT BITS RMS:'      16.4354191
AIPS 1: 'NUMBER CORRECT BITS MAX:'       3.5376263
AIPS 1: 'NUMBER CORRECT BITS RMS:'      11.5676575
AIPS 1: 'NUMBER CORRECT BITS MAX:'       3.4324644
AIPS 1: 'NUMBER CORRECT BITS RMS:'      11.1726274

and here it is for the HUGE test

-> grep BITS Y2K_HUGE.log
AIPS 2:    TYPE 'NUMBER CORRECT BITS MAX: ', MAPDIF(1,JJCNT)
AIPS 2:    TYPE 'NUMBER CORRECT BITS RMS: ', MAPDIF(2,JJCNT)
AIPS 2: 'NUMBER CORRECT BITS MAX:'      13.1464624
AIPS 2: 'NUMBER CORRECT BITS RMS:'      17.0951157
AIPS 2: 'NUMBER CORRECT BITS MAX:'      15.2415934
AIPS 2: 'NUMBER CORRECT BITS RMS:'      18.2353897
AIPS 2: 'NUMBER CORRECT BITS MAX:'       0.8875204
AIPS 2: 'NUMBER CORRECT BITS RMS:'       7.1682196
AIPS 2: 'NUMBER CORRECT BITS MAX:'       2.7311242
AIPS 2: 'NUMBER CORRECT BITS RMS:'       7.5666523
AIPS 2: 'NUMBER CORRECT BITS MAX:'       2.1505158
AIPS 2: 'NUMBER CORRECT BITS RMS:'       7.1010847
AIPS 2: 'NUMBER CORRECT BITS MAX:'       6.807672
AIPS 2: 'NUMBER CORRECT BITS RMS:'      15.635848


-- Joe

-- 
T. Joseph W. Lazio, Ph.D.        voice: +1 202 404 6329
Remote Sensing Division          fax:   +1 202 404 8894
Naval Research Lab, Code 7213    Joseph.Lazio at nrl.navy.mil
Washington, DC 20375-5351 USA    http://rsd-www.nrl.navy.mil/7213/lazio/