[SciPy-user] scipy 0.7.0.dev4373 + atlas FAILED (failures=2, errors=12)

[Xavier Gnata]

David Cournapeau wrote:
> Xavier Gnata wrote:
>   
>>> Not sure about this one. Probably a real bug.
>>>       
>
> This error is often seen when mixing g77/gfortran. hardy still uses g77 
> as the default fortran compiler, so it is easy to make a mistake there.
>
>   
>> Thanks for our support :)
>> I used to use the atlas unbutu package but I would like to understand 
>> how to compile ATLAS and to see if there is a real performance 
>> improvement or not. As you said,it should note be that large...
>>     
>
> It is large if you are using a recent core 2 duo: the atlas package 
> (sse2) are built for pentium4 which has a deficient L1 cache, whereas 
> core 2 duo has much better behaviour. For large matrices, this can be 
> significant.
>
> How did you build lapack ? From lapack 3.1.1, you only need to use this 
> as the make.inc:
>
> ####################################################################
> #  LAPACK make include file.                                       #
> #  LAPACK, Version 3.1.1                                           #
> #  February 2007                                                   #
> ####################################################################
> #
> SHELL = /bin/sh
> #
> #  The machine (platform) identifier to append to the library names
> #
> PLAT = _LINUX
> #
> #  Modify the FORTRAN and OPTS definitions to refer to the
> #  compiler and desired compiler options for your machine.  NOOPT
> #  refers to the compiler options desired when NO OPTIMIZATION is
> #  selected.  Define LOADER and LOADOPTS to refer to the loader and
> #  desired load options for your machine.
> #
> FORTRAN  = gfortran
> OPTS     = -O2 -fPIC
> DRVOPTS  = $(OPTS)
> NOOPT    = -O0 -fPIC
> LOADER   = gfortran
> LOADOPTS =
> #
> # Timer for the SECOND and DSECND routines
> #
> # Default : SECOND and DSECND will use a call to the EXTERNAL FUNCTION ETIME
> #TIMER    = EXT_ETIME
> # For RS6K : SECOND and DSECND will use a call to the EXTERNAL FUNCTION 
> ETIME_
> # TIMER    = EXT_ETIME_
> # For gfortran compiler: SECOND and DSECND will use a call to the 
> INTERNAL FUNCTION ETIME
> TIMER    = INT_ETIME
> # If your Fortran compiler does not provide etime (like Nag Fortran 
> Compiler, etc...)
> # SECOND and DSECND will use a call to the INTERNAL FUNCTION CPU_TIME
> # TIMER    = INT_CPU_TIME
> # If neither of this works...you can use the NONE value... In that case, 
> SECOND and DSECND will always return 0
> # TIMER     = NONE
> #
> #  The archiver and the flag(s) to use when building archive (library)
> #  If you system has no ranlib, set RANLIB = echo.
> #
> ARCH     = ar
> ARCHFLAGS= cr
> RANLIB   = ranlib
>
> LAPACKLIB = liblapack_pic.
>
> And then, to build atlas:
>
> ./configure -C if gfortran -Fa alg -fPIC 
> --with-netlib-lapack=PATH_TO_LAPACK/liblapack_pic.a
>
> But really, you have to think about the pain to build and make sure it 
> works with the time you gain by having a faster atlas. I bet that for 
> the time you need to make it work, you could have inverted millions of 
> big matrices :)
>
> cheers,
>
> David
> _______________________________________________
>   

Ok I give up and I use the ubuntu packages.
I hope that the documentation project will provide us with a nice "how 
to install scipy without errors".
btw, this odcumentation project is the best news of the day ;)

Xavier