Error running FORTRAN code Post: 302534201

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Top Forums Programming Error running FORTRAN code Post 302534201 by sandhyakg on Monday 27th of June 2011 07:00:45 AM

06-27-2011

Registered User

Error running FORTRAN code

Hi,
I am new to this forum and do not know whether this is the appropriate place to post this question. Anyway am trying my luck.

I have a fortran program swanhcat.ftn, which is part of a wave modelling system. There is also a file hcat.nml which is required to run this program. The program's job is to combine many files (say 250) into a single file. It is of course not concatenation. The program was compiled and run. It worked fine when the number of input files to the program was a certain number (say 180) and failed when there were more number of input files. I should say that the input files are big. I give below details of one such file.
-rw-r--r-- 1 osf staff 15208731 Jun 27 12:40 restart_20090101.00-132

Actually the files are like restart_20090101.00-001, restart_20090101.00-002..... restart_20090101.00-180 and are the outputs of a numerical model run using 180 processors. Each processor does some part of the model run and thus the final information is contained in the 180 files together. I am trying to combine the information into a single file using the swanhcat.ftn program. It was a success when I tried with 180 processors (there were 180 input files).
When I tried with 181 input files(or higher), the program failed saying
'segmentation fault(core dumped)'. Does it have to do something with the memory used by the program?

How do I find out what is wrong?

Best regards,
s.

sandhyakg

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LEARN ABOUT DEBIAN

somnec

SOMNEC(1)						      General Commands Manual							 SOMNEC(1)

NAME

       somnec - Compute Sommerfield-Norton Ground Grids

SYNOPSIS

       somnec

DESCRIPTION

       somnec  is  a  program to generates grids used by the NEC2 program for the Sommerfeld-Norton approximation to realistic grounds.  It allows
       interactive user input of relative dielectric constant, ground conductivity, and frequency in MHz.  The output for use by nec2  is  written
       out  as	binary unformatted file.  The program .B nec2 reads this in, if the Sommerfield Norton Ground is specified in the nec2 input cards
       by the presence of a suitable suitable  Ground Parameters Card i.e. a GN card with IPERF set to 2 (coluns 3-5).	Hence  the  user  is  also
       prompted for a file name, and the grid arrays are written to the file.

OPTIONS

       Due  to	the  age of the program, it expects its input to be in the form of punched cards fed into a hopper.  It doesn't currently take any
       options, instead the name of the input and output files must be entered once the program has been run.

SEE ALSO

       nec(1)

       It is fully documented as part of the report Numerical Electromagnetics Code (NEC) -- Method of Moments", available as a  printed  publica-
       tion in three parts covering the theory of operation, the program code and the users' manual.

BUGS

       This  program  was  keyed  in  by  hand from a printed listing.	Thus it is possible that some extra bugs have been introduced. Unformatted
       binary files are often a fortran minefield, particuarly if transported between systems.

AUTHOR

       This manual page was written by	<alanb@chiark.greenend.org.uk>.  The original program was developed by G. J. Burke and	A.  J.	Poggio	of
       Laurence Livermore Laboratory.

																	 SOMNEC(1)