[MITgcm-support] linux_ia32_ifort

[Martin Losch]

Dimitris,

I use linux_ia32_ifort as it is on a redhat 9 something system. After  
having a look at the man-pages I think that
  -DWORDLENGTH=1
is equivalent to the combination of
-DWORDLENGTH=4
and
-assume byterecl
because according to man-pages:
>               · -assume byterecl
>
>                 Specifies (for unformatted data files) that the units 
> for  the
>                 OPEN  statement  RECL  specifier  (record length) 
> value are in
>                 bytes, not longwords (four-byte units). For  formatted 
>  files,
>                 the  RECL  unit  is  always  in  bytes. The default is 
> -assume
>                 nobyterecl.

BTW, I think the -D_BYTESWAPIO could be replaced by a compiler option
-convert big_endian
I haven't tried using this with the MITgcm yet, but with other 
applications. I don't know if that's any faster than the -D_BYTESWAPIO.

Martin

On Sep 27, 2004, at 8:26 PM, Dimitris Menemenlis wrote:

> Ed, the following changes appear to be needed in linux_ia32_ifort
> for ifort 8.0.  Anyone else using ifort 8.0 succesfully with original
> linux_ia32_ifort ?
>
> D.
>
> #!/bin/bash
> #
> #  Ed Hill
> #
> #  tested on faulks, 20030818
> #
> #  Build options for the intel 8.0 fortran compiler
> #  the compiler is now called ifort (not ifc) and it appears to
> #  need -DWORDLENGTH=1 and not -DWORDLENGTH=4
> #  (which is what ifc 6.0) used to have.
>
>
> CPP='/lib/cpp  -traditional -P'
>
> #  Note that the -mp switch is for ieee "maintain precision" and is
> #  roughly equivalent to -ieee
> if test "x$IEEE" = x ; then
>     FFLAGS='-132 -r8 -i4 -w95 -W0 -WB -assume byterecl'
> else
>     FFLAGS='-mp -132 -r8 -i4 -w95 -W0 -WB -assume byterecl'
> fi
>
> FOPTIM='-O3 -align'
> #P3  FOPTIM     = ( $FOPTIM '-tpp6 -xWKM' )
> #P4  FOPTIM     = ( $FOPTIM '-tpp7 -xWKM' )
>
> FC=ifort
> DEFINES='-D_BYTESWAPIO -DWORDLENGTH=4'
>
>
> -- 
> Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
> Jet Propulsion Lab, California Institute of Technology
> MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099
> tel: 818-354-1656;  fax: 818-393-6720
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