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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mpif77

HF77(1) 							     LAM TOOLS								   HF77(1)

NAME

       hf77, mpif77 - Compile LAM FORTRAN programs.

SYNTAX

       hf77 [-showme] ...

       see f77(1) (or whatever your underlying FORTRAN compiler is) for all other options.

DESCRIPTION

       hf77  is  a convenience wrapper for the local native FORTRAN compiler.  Translation of a LAM program requires the linkage of the LAM essen-
       tial services libraries which may not reside in one of the standard search directories of ld(1).  hf77 passes its arguments  along  to  the
       local native FORTRAN compiler along with the -L and -l options required by LAM/MPI programs.  This includes all necessary options for ROMIO
       and/or C++ bindings support (if ROMIO/C++ support was included when LAM was compiled).

       mpif77 is now the same as hf77.	See the NOTES section, below.

       By default, hf77 uses the FORTRAN compiler that was selected when LAM was configured (with the --with-fc flag to ./configure) as the  local
       native FORTRAN compiler, but this can be overridden by the LAMHF77 environment variable.

OPTIONS

       -showme
	      Does  not  invoke the underlying FORTRAN compiler.  Instead, it shows the command line that would be executed to compile the FORTRAN
	      program.

NOTES

       Previous versions of hf77 did not automatically link in the MPI library.  Starting with LAM version 6.3, since hf77 has become the de facto
       LAM FORTRAN compiler, the -lmpi option is now automatically passed to the underlying compiler when linking LAM/MPI programs.

       Previous  versions  of  LAM included the mpif77 wrapper script to automatically pass -lmpi to hf77.  This script is now obsolete since hf77
       now includes -lmpi automatically.  mpif77 is now a symbolic link to hf77 to ensure backward compatibility.

SEE ALSO

       f77(1), ld(1), lam-helpfile(1)

LAM 6.5.8							  November, 2002							   HF77(1)