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112 lines
3.5 KiB
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112 lines
3.5 KiB
HTML
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HREF="node6.html">Application structure</A>
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<H3><A NAME="SECTION00033100000000000000"></A>
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<A NAME="sec:usermaps"></A>
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User-defined index mappings
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</H3>
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PSBLAS supports user-defined global to local index mappings, subject
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to the constraints outlined in sec. <A HREF="node6.html#sec:appstruct">2.3</A>:
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<OL>
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<LI>The set of indices owned locally must be mapped to the set
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<!-- MATH
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$1\dots n_{\hbox{row}_i}$
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WIDTH="77" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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</LI>
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<LI>The set of halo points must be mapped to the set
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<!-- MATH
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$n_{\hbox{row}_i}+1\dots n_{\hbox{col}_i}$
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SRC="img18.png"
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ALT="$n_{\hbox{row}_i}+1\dots n_{\hbox{col}_i}$">;
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</OL>
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but otherwise the mapping is arbitrary. The user application is
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responsible to ensure consistency of this mapping; some errors may be
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caught by the library, but this is not guaranteed.
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The application structure to
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support this usage is as follows:
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<OL>
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<LI>Initialize index space with
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<code>psb_cdall(ictx,desc,info,vl=vl,lidx=lidx)</code> passing the vectors
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<code>vl(:)</code> containing the set of global indices owned by the
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current process and <code>lidx(:)</code> containing the corresponding
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local indices;
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</LI>
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<LI>Add the halo points <code>ja(:)</code> and their associated local
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indices <code>lidx(:)</code> with a(some) call(s) to
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<code>psb_cdins(nz,ja,desc,info,lidx=lidx)</code>;
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</LI>
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<LI>Assemble the descriptor with <code>psb_cdasb</code>;
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</LI>
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<LI>Build the sparse matrices and vectors, optionally making use in
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<code>psb_spins</code> and <code>psb_geins</code> of the <code>local</code> argument
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specifying that the indices in <code>ia</code>, <code>ja</code> and <code>irw</code>,
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respectively, are already local indices.
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</LI>
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</OL>
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