From bug-request at octave dot org Wed Jan 11 22:50:41 2006
Subject: Re: Compiling octave with Intel C++/Fortran compilers on Linux
From: Shai Ayal <shaia at biocontrol dot co dot il>
To: "Tetsuji \"Maverick\" Rai" <maverick31337 at gmail dot com>
Cc: bug at octave dot org
Date: Thu, 12 Jan 2006 06:40:00 +0200

Can you show some results which show it is faster and probably more 
accurate ?

Shai

Tetsuji "Maverick" Rai wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi,
> 
> I've successfully compiled octave with Intel C++/Fortran compiler on
> Gentoo Linux on P4 to make it faster and probably more accurate (because
> it's more accurate than gcc-3.4.4 with proper options.)  But I needed a
> tweak, so I write diff here.
> 
> It's in src/oct-stream.cc, and the diff for 2.1.72 is
> 
> *** ../../octave-2.1.72/src/oct-stream.cc       Sat Nov 12 04:48:27 2005
> - ---- ./oct-stream.cc     Thu Jan 12 05:47:20 2006
> ***************
> *** 1143,1148 ****
> - ---- 1143,1149 ----
>   octave_scan (std::istream&, const scanf_format_elt&, float*);
>   #endif
> 
> + #if !defined(__INTEL_COMPILER) // TMR
>   template <>
>   std::istream&
>   octave_scan (std::istream& is, const scanf_format_elt& fmt, double*
> valptr)
> ***************
> *** 1317,1323 ****
> 
>     return is;
>   }
> !
>   template std::istream&
>   octave_scan (std::istream&, const scanf_format_elt&, double*);
> 
> - ---- 1318,1324 ----
> 
>     return is;
>   }
> ! #endif //TMR
>   template std::istream&
>   octave_scan (std::istream&, const scanf_format_elt&, double*);
> 
> 
> In order to compile octave with Intel C++ 9.0/Fortran 9.0, at first
> install these compilers (as a matter of course!) and set these
> environment variables:
> 
> export CC=icc
> export CFLAGS='-O3 -mp -xP -ip -I/usr/local/include'
> export CXX=icpc
> export CXXFLAGS='-O3 -mp -xP -ip -I/usr/local/include'
> export F77=ifort
> export FFLAGS='-O3 -mp -xP -ip -I/usr/local/include'
> export LDFLAGS='-L/usr/local/lib -lsvml'
> 
> Last "-L/usr/local/lib" specifies the location of fftw library.  Then
> ./configure and make as usual.  In these options, -mp option keeps ieee
> compliant accuracy (by default, fortran compiler isn't given -mieee-fp
> option) -xP specifies sse3 (so one has to change it to -xW for sse2, -xK
> for sse), and -ip for single file interprocedural optimization.  I also
> tried -ipo[n] flag, but I found octave was too large to utilize that
> option; it took too long to link octave.   -ipo[large number] may work
> (I'm trying,) but in that case, one needs to set "export AR=xiar" also.
> 
> fftw can also be compiled with these options to make it faster.
> 
> regards,
> 
> 
> - --
> Tetsuji 'Maverick' Rai
> main page http://maverick6664.bravehost.com/
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> 
> 
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