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fortranmpigfortranquadruple-precision
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Reputation: 155

MPICH libraries for quadruple precision not recognised by FFTW3?

I am converting my parallel double precision fortran code that involves calls to FFTW3 and BLAS-LAPACK packages to parallel quadruple precision.

I have installed FFTW3 for quadruple precision as follows:

./configure --enable-quad-precision

described in: http://fftw.org/fftw3_doc/Installation-on-Unix.html#Installation-on-Unix

A sample serial code that calls these libraries works without any issues. I have linked to lquadmath here which tells me that the serial compiler gfortran has that library.

However, to install FFTW3 with parallel libraries requires another tag

./configure --enable-mpi --enable-quad-precision

When I try this there is an error:

configure: error: quad precision is not supported in MPI

Following is my install script for mpich-3.2.1:

./configure --enable-f90 F77=gfortran FC=gfortran CC=gcc
make 
make install

I have tried a mpigather and mpiscatter test using REAL16 datatype (https://www.mpi-forum.org/docs/mpi-2.1/mpi21-report-bw/node330.htm) to scatter multiples of pi and it worked alright.

However, FFTW3 does not recognize this.. How do I proceed? Thankyou for your time.

Upvotes: 1

Views: 277

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