[mpich-discuss] MPICH2 and LAPACK

[Hélvio Vairinhos]

Hi Gus,

Your suggestion solved my problem! It was just a matter of passing to 
mpif90 the directory where the libraries are located. In a standard 
Cygwin installation, the command line is simply:

% mpif90 foo.f90 -L/lib/lapack -llapack -lblas

Thank you very much!

Hélvio.


On 11-05-2010 04:04, Gus Correa wrote:
> Hi Helvio
>
> If the LAPACK and BLAS libraries are not in
> conventional directories, the linker won't find them.
>
> Try to pass the directories where they are to the mpif90 wrapper,
> something like this:
>
> mpif90 foo.f90 -L/path/to/lapack/lib -llapack -L/path/to/blas/lib -lblas
>
> I hope this helps,
> Gus Correa
> ---------------------------------------------------------------------
> Gustavo Correa
> Lamont-Doherty Earth Observatory - Columbia University
> Palisades, NY, 10964-8000 - USA
> ---------------------------------------------------------------------
>
> Hélvio Vairinhos wrote:
>> Thanks for the reply! I tried to compile my code using:
>>
>> % mpif90 foo.f90 -llapack -lblas
>>
>> but I always get the following message:
>>
>> % /bin///ld: cannot find -llapack
>> % /bin///ld: cannot find -lblas
>>
>> My test code is very simple:
>>   1. I initialize MPI,
>>   2. I construct two simple 5x5 matrices,
>>   3. I call the matrix multiplication routine (xGEMM),
>>   4. I print the result and RANK,
>>   5. I finalize MPI.
>>
>> In principle this should return and print as many matrices as CPU's I 
>> use to run the executable. However, mpif90 doesn't seem to allow the 
>> -llapack or -lblas flags... So, since apparently I can't use the 
>> libraries from the Cygwin installation, how should I proceed to be 
>> able to compile LAPACK routines with mpif90?
>>
>> Cheers,
>>
>> -- Hélvio
>>
>>
>> On 10-05-2010 23:51, Pavan Balaji wrote:
>>>
>>> If I understand what you are doing correctly, you don't need to 
>>> recompile LAPACK -- you can continue using the single process LAPACK 
>>> functions within each MPI process. As you noted, you just compile 
>>> your application with mpif90 instead of gfortran; everything else 
>>> stays the same. For example, you can do:
>>>
>>> % mpif90 foo.f -llapack -lblas
>>>
>>> instead of
>>>
>>> % gfortran foo.f -llapack -lblas
>>>
>>>  -- Pavan
>>>
>>> On 05/10/2010 05:47 PM, Hélvio Vairinhos wrote:
>>>> Hi, I am new to this forum, and this is my first post.
>>>>
>>>> I am developing a code in Fortran 90, and I use some basic MPI 
>>>> commands and LAPACK routines. I work in a Windows platform, but I 
>>>> use Cygwin for development. I use the LAPACK package that comes 
>>>> with the Cygwin installation, which works perfectly fine when I 
>>>> compile F90 codes with gfortran (the usual -llapack -lblas flags). 
>>>> But now I want to parallelized my code by adding some basic MPI 
>>>> commands. For this purpose, I installed MPICH2 from source, and use 
>>>> mpif90 to compile my parallel codes in Cygwin; it works perfectly 
>>>> fine! However, I don't know how to compile my codes when both MPI 
>>>> commands and LAPACK routine calls are present.
>>>>
>>>> So my questions are: How can I compile LAPACK routines (not 
>>>> ScaLAPACK) with mpif90? Is it possible to use the LAPACK routines 
>>>> that come with the Cygwin installation?
>>>>
>>>> Any help is appreciated. Thanks!
>>>>
>>>> -- Hélvio
>>>>
>>>>
>>>> ------------------------------------------------------------------------ 
>>>>
>>>>
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>>>> mpich-discuss mailing list
>>>> mpich-discuss at mcs.anl.gov
>>>> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>>>
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