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Chris@82: <title>FFTW 3.3.8: FFTW MPI Installation</title>
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Chris@82: <a name="FFTW-MPI-Installation-1"></a>
Chris@82: <h3 class="section">6.1 FFTW MPI Installation</h3>
Chris@82:
Chris@82: <p>All of the FFTW MPI code is located in the <code>mpi</code> subdirectory of
Chris@82: the FFTW package. On Unix systems, the FFTW MPI libraries and header
Chris@82: files are automatically configured, compiled, and installed along with
Chris@82: the uniprocessor FFTW libraries simply by including
Chris@82: <code>--enable-mpi</code> in the flags to the <code>configure</code> script
Chris@82: (see <a href="Installation-on-Unix.html#Installation-on-Unix">Installation on Unix</a>).
Chris@82: <a name="index-configure-1"></a>
Chris@82: </p>
Chris@82:
Chris@82: <p>Any implementation of the MPI standard, version 1 or later, should
Chris@82: work with FFTW. The <code>configure</code> script will attempt to
Chris@82: automatically detect how to compile and link code using your MPI
Chris@82: implementation. In some cases, especially if you have multiple
Chris@82: different MPI implementations installed or have an unusual MPI
Chris@82: software package, you may need to provide this information explicitly.
Chris@82: </p>
Chris@82: <p>Most commonly, one compiles MPI code by invoking a special compiler
Chris@82: command, typically <code>mpicc</code> for C code. The <code>configure</code>
Chris@82: script knows the most common names for this command, but you can
Chris@82: specify the MPI compilation command explicitly by setting the
Chris@82: <code>MPICC</code> variable, as in ‘<samp>./configure MPICC=mpicc ...</samp>’.
Chris@82: <a name="index-mpicc"></a>
Chris@82: </p>
Chris@82:
Chris@82: <p>If, instead of a special compiler command, you need to link a certain
Chris@82: library, you can specify the link command via the <code>MPILIBS</code>
Chris@82: variable, as in ‘<samp>./configure MPILIBS=-lmpi ...</samp>’. Note that if
Chris@82: your MPI library is installed in a non-standard location (one the
Chris@82: compiler does not know about by default), you may also have to specify
Chris@82: the location of the library and header files via <code>LDFLAGS</code> and
Chris@82: <code>CPPFLAGS</code> variables, respectively, as in ‘<samp>./configure
Chris@82: LDFLAGS=-L/path/to/mpi/libs CPPFLAGS=-I/path/to/mpi/include ...</samp>’.
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