Fortran code error: forrtl: severe (66)

nox13

Hi everybody,

I have old Fortran code, originally written in the mid 1970's for an Elmer system. The code has been adapted through the years, last run successfully in 2009.

The code has now landed on my lap after having been "retired" due to obsolescence. I am a pure Fortran beginner.

I have managed to recompile everything using Visual Fortran and MS Development Studio. However, when running certain executables I get the following error:


********************************************************
* EXECUTING GENERATE !!!! *
* *
* This program may be executed several times *
* *
********************************************************

1 file(s) copied.
Enter date - YYYYMMDD
20120404
forrtl: severe (66): output statement overflows record, unit 10, file C:\IMPALA2
\FATIMP1M


Is there anybody out there that can assist with solving this problem? If you need further information, please let me know.

Thanks in advance!

gsal

do YOU have any idea where the problem could be?
do you have the source code?
the part where it tries to write to unit 10?
have YOU trie to do ANY kind of debugging?

dodo

Fortran... oh such memories...

Google does wonders in cases like this. Hope this helps:
http://www.hpc.unimelb.edu.au/doc/f90lrm/dfum_033.html

nox13

Thanks for the replies so far.

Using my limited knowledge and Google, I deduced that it could be one of 2 problems.

1) The input received (read command - type, length) did not match the output (write command - type length)

2) Calls to and from Unit 10 are invalid

I am starting to run through the code, line by line and trace where the calls come from and go to.

I have the source code available. The program compiles without any errors.

dodo

Hi, nox13,
if I'm reading correctly the error list I linked to (and if I remember correctly),

my guess is that your program is trying to write a file in fixed-sized records (the record size being determined possibly by a "RECL" keyword in the open statement), and the "write" instruction is trying to write data that results in more bytes that the given record size.

Maybe posting part of your code would help (at least the opening of the file on unit 10, and the write statements on it).

nox13

The code for the part of the program calling unit 10:

**************

OPEN MAIN FILE
OPEN(UNIT=10,FILE=mainfile,STATUS='OLD',ACCESS='DIRECT', !hl1
*recl=81,FORM='FORMATTED' ) !hl1
c *COUNTBY='RECORD',FORM='FORMATTED',IOSTAT=ISTAT)
C
C READ LAST DATE FROM MAIN FILE, INPUT DATE FROM CARDS, CALCULATE NO.
C OF DAYS BETWEEN RUNS
READ(10,900,REC=1)LDATE
NEXFLR=2
!sh01
! WRITE(6,*)' ENTER DATE - YYMMDD' !hl1
WRITE(6,*)' Enter date - YYYYMMDD'
!
READ(5,910)IDAY

NRUND = IDAYS(IDAY(1),IDAY(2),IDAY(3))
!sh01
! ldate=ldate
! NLASTD = IDAYS2(LDATE)
NLASTD = IDAYS(LDATE(1),LDATE(2),LDATE(3))
!
NUMDAY = NRUND - NLASTD

C WRITE NEW DATE TO SUMMARY FILE
WRITE(12,920)IDAY

*************
!sh1 refers to changes made to the code to account for Y2K.

The format are as follows:

*************

!sh01
!900 FORMAT(9X,I6)
!910 FORMAT(3I2.2)
!920 FORMAT(1X,3I2.2)
!930 FORMAT(55X,22('*')/55X,'LAST RUN DATE -',I7/55X,22('*')/'1')
900 FORMAT(9X,I4,2I2)
910 FORMAT(I4,2I2)
920 FORMAT(1X,I4,2I2.2)
930 FORMAT(55X,26('*')/55X,'LAST RUN DATE - ',I4,2('/',I2.2)/
+ 55X,26('*')/'1')

*****************

Mark44

Added [ code ] and [ /code ] tags to improve readability.
It looks to me like the problem is the line where the code is attempting to write to unit 12, which might not have been opened.

nox13

Thanks Mark44. I will implement where possible.

Debugging is slow but progressing.

Having a problem now with the \n carriage return command. This command seems to not be recognized by Digital Fortran...is there an alternative command that I can try? The / command doesn't change the format of the output either in this instance.

Apologies for the noob questions.

gsal

I will venture to say that you don't really need ACCESS='DIRECT' or recl=81; please read these two pages and review your READ/WRITE knowledge:

http://www.personal.psu.edu/jhm/f90/lectures/22.html

http://rsusu1.rnd.runnet.ru/develop/...7/node162.html

dodo

Curiously enough, the error was about output to unit 10, which does not appear to relate to the piece of code you posted. Maybe the faulty code is somewhere forward - look for further writes to unit=10.

Also, I was thinking that a likely possibility for a program that was OK and now fails with this error, is that the variable sizes have changed. Maybe the "recl=81" assumed a certain integer size (16? 32 bits?) and now you are on a machine where integers are larger. When the program tries to write a bunch of those into one record... they won't fit anymore.

Without seeing the actual write(unit=10,...), it's just guessing, of course.