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<H3><A NAME="SECTION000411000000000000000">
psb_cd_set_large_threshold -- Set threshold for
  index mapping switch</A>
</H3>

<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. 

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