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Document DESC%CNV method and MOLD arguments to CDASB and PREC%BUILD

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Salvatore Filippone
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<TITLE>Named Constants</TITLE>
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<TITLE>psb_cd_set_large_threshold -- Set threshold for index mapping switch</TITLE>
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<H3><A NAME="SECTION000411100000000000000"></A>
<A NAME="sec:cd_constants"></A>
<BR>
Named Constants
<H3><A NAME="SECTION000411100000000000000">
psb_cd_set_large_threshold -- Set threshold for
index mapping switch</A>
</H3>
<DL>
<DT><STRONG>psb_none_</STRONG></DT>
<DD>Generic no-op;
</DD>
<DT><STRONG>psb_root_</STRONG></DT>
<DD>Default root process for broadcast and scatter operations;
</DD>
<DT><STRONG>psb_nohalo_</STRONG></DT>
<DD>Do not fetch halo elements;
</DD>
<DT><STRONG>psb_halo_</STRONG></DT>
<DD>Fetch halo elements from neighbouring processes;
</DD>
<DT><STRONG>psb_sum_</STRONG></DT>
<DD>Sum overlapped elements
</DD>
<DT><STRONG>psb_avg_</STRONG></DT>
<DD>Average overlapped elements
</DD>
<DT><STRONG>psb_comm_halo_</STRONG></DT>
<DD>Exchange data based on the <code>halo_index</code>
list;
</DD>
<DT><STRONG>psb_comm_ext_</STRONG></DT>
<DD>Exchange data based on the <code>ext_index</code>
list;
</DD>
<DT><STRONG>psb_comm_ovr_</STRONG></DT>
<DD>Exchange data based on the <code>ovrlap_index</code>
list;
</DD>
<DT><STRONG>psb_comm_mov_</STRONG></DT>
<DD>Exchange data based on the <code>ovr_mst_idx</code>
list;
<P>
<PRE>
call psb_cd_set_large_threshold(ith)
</PRE>
<P>
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>ith</STRONG></DT>
<DD>the new threshold for communication descriptors.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value greater than zero.
</DD>
</DL>
Note: the threshold value is only queried by the library at the time a
call to <code>psb_cdall</code> is executed, therefore changing the threshold
has no effect on communication descriptors that have already been
initialized. Moreover the threshold must have the same value on all
processes.
<P>
<BR><HR>