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diff Lib/fftw-3.2.1/doc/html/FFTW-MPI-Performance-Tips.html @ 15:585caf503ef5 tip

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Tidy up for ROLI
author Geogaddi\David <d.m.ronan@qmul.ac.uk>
date Tue, 17 May 2016 18:50:19 +0100
parents 636c989477e7
children
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--- a/Lib/fftw-3.2.1/doc/html/FFTW-MPI-Performance-Tips.html	Wed May 04 11:02:59 2016 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
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-<html lang="en">
-<head>
-<title>FFTW MPI Performance Tips - FFTW 3.2alpha3</title>
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-Copyright (C) 2003 Matteo Frigo.
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-<a name="FFTW-MPI-Performance-Tips"></a>
-Next:&nbsp;<a rel="next" accesskey="n" href="Combining-MPI-and-Threads.html#Combining-MPI-and-Threads">Combining MPI and Threads</a>,
-Previous:&nbsp;<a rel="previous" accesskey="p" href="Avoiding-MPI-Deadlocks.html#Avoiding-MPI-Deadlocks">Avoiding MPI Deadlocks</a>,
-Up:&nbsp;<a rel="up" accesskey="u" href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI">Distributed-memory FFTW with MPI</a>
-<hr>
-</div>
-
-<h3 class="section">6.10 FFTW MPI Performance Tips</h3>
-
-<p>In this section, we collect a few tips on getting the best performance
-out of FFTW's MPI transforms.
-
-   <p>First, because of the 1d block distribution, FFTW's parallelization is
-currently limited by the size of the first dimension. 
-(Multidimensional block distributions may be supported by a future
-version.) More generally, you should ideally arrange the dimensions so
-that FFTW can divide them equally among the processes. See <a href="Load-balancing.html#Load-balancing">Load balancing</a>. 
-<a name="index-block-distribution-394"></a><a name="index-load-balancing-395"></a>
-Second, if it is not too inconvenient, you should consider working
-with transposed output for multidimensional plans, as this saves a
-considerable amount of communications.  See <a href="Transposed-distributions.html#Transposed-distributions">Transposed distributions</a>. 
-<a name="index-transpose-396"></a>
-Third, the fastest choices are generally either an in-place transform
-or an out-of-place transform with the <code>FFTW_DESTROY_INPUT</code> flag
-(which allows the input array to be used as scratch space).  In-place
-is especially beneficial if the amount of data per process is large. 
-<a name="index-FFTW_005fDESTROY_005fINPUT-397"></a>
-Fourth, if you have multiple arrays to transform at once, rather than
-calling FFTW's MPI transforms several times it usually seems to be
-faster to interleave the data and use the advanced interface.  (This
-groups the communications together instead of requiring separate
-messages for each transform.)
-
-<!--  -->
-</body></html>
-