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| author | Chris Cannam |
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| date | Wed, 20 Mar 2013 15:35:50 +0000 |
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| 9:c0fb53affa76 | 10:37bf6b4a2645 |
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| 1 <html lang="en"> | |
| 2 <head> | |
| 3 <title>Linking and Initializing MPI FFTW - FFTW 3.3.3</title> | |
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| 5 <meta name="description" content="FFTW 3.3.3"> | |
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| 8 <link rel="up" href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI" title="Distributed-memory FFTW with MPI"> | |
| 9 <link rel="prev" href="FFTW-MPI-Installation.html#FFTW-MPI-Installation" title="FFTW MPI Installation"> | |
| 10 <link rel="next" href="2d-MPI-example.html#g_t2d-MPI-example" title="2d MPI example"> | |
| 11 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> | |
| 12 <!-- | |
| 13 This manual is for FFTW | |
| 14 (version 3.3.3, 25 November 2012). | |
| 15 | |
| 16 Copyright (C) 2003 Matteo Frigo. | |
| 17 | |
| 18 Copyright (C) 2003 Massachusetts Institute of Technology. | |
| 19 | |
| 20 Permission is granted to make and distribute verbatim copies of | |
| 21 this manual provided the copyright notice and this permission | |
| 22 notice are preserved on all copies. | |
| 23 | |
| 24 Permission is granted to copy and distribute modified versions of | |
| 25 this manual under the conditions for verbatim copying, provided | |
| 26 that the entire resulting derived work is distributed under the | |
| 27 terms of a permission notice identical to this one. | |
| 28 | |
| 29 Permission is granted to copy and distribute translations of this | |
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| 48 <div class="node"> | |
| 49 <a name="Linking-and-Initializing-MPI-FFTW"></a> | |
| 50 <p> | |
| 51 Next: <a rel="next" accesskey="n" href="2d-MPI-example.html#g_t2d-MPI-example">2d MPI example</a>, | |
| 52 Previous: <a rel="previous" accesskey="p" href="FFTW-MPI-Installation.html#FFTW-MPI-Installation">FFTW MPI Installation</a>, | |
| 53 Up: <a rel="up" accesskey="u" href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI">Distributed-memory FFTW with MPI</a> | |
| 54 <hr> | |
| 55 </div> | |
| 56 | |
| 57 <h3 class="section">6.2 Linking and Initializing MPI FFTW</h3> | |
| 58 | |
| 59 <p>Programs using the MPI FFTW routines should be linked with | |
| 60 <code>-lfftw3_mpi -lfftw3 -lm</code> on Unix in double precision, | |
| 61 <code>-lfftw3f_mpi -lfftw3f -lm</code> in single precision, and so on | |
| 62 (see <a href="Precision.html#Precision">Precision</a>). You will also need to link with whatever library | |
| 63 is responsible for MPI on your system; in most MPI implementations, | |
| 64 there is a special compiler alias named <code>mpicc</code> to compile and | |
| 65 link MPI code. | |
| 66 <a name="index-mpicc-351"></a><a name="index-linking-on-Unix-352"></a><a name="index-precision-353"></a> | |
| 67 | |
| 68 <p><a name="index-fftw_005finit_005fthreads-354"></a>Before calling any FFTW routines except possibly | |
| 69 <code>fftw_init_threads</code> (see <a href="Combining-MPI-and-Threads.html#Combining-MPI-and-Threads">Combining MPI and Threads</a>), but after calling | |
| 70 <code>MPI_Init</code>, you should call the function: | |
| 71 | |
| 72 <pre class="example"> void fftw_mpi_init(void); | |
| 73 </pre> | |
| 74 <p><a name="index-fftw_005fmpi_005finit-355"></a> | |
| 75 If, at the end of your program, you want to get rid of all memory and | |
| 76 other resources allocated internally by FFTW, for both the serial and | |
| 77 MPI routines, you can call: | |
| 78 | |
| 79 <pre class="example"> void fftw_mpi_cleanup(void); | |
| 80 </pre> | |
| 81 <p><a name="index-fftw_005fmpi_005fcleanup-356"></a> | |
| 82 which is much like the <code>fftw_cleanup()</code> function except that it | |
| 83 also gets rid of FFTW's MPI-related data. You must <em>not</em> execute | |
| 84 any previously created plans after calling this function. | |
| 85 | |
| 86 <!-- --> | |
| 87 </body></html> | |
| 88 |