[mpich-discuss] MPICH2 and LAPACK

[Hélvio Vairinhos]

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
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> mpich-discuss mailing list
>> mpich-discuss at mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>