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178 lines
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178 lines
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<H2><A NAME="SECTION00081000000000000000">
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psb_init -- Initializes PSBLAS parallel
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environment</A>
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</H2>
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<P>
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<PRE>
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call psb_init(icontxt, np, basectxt, ids)
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</PRE>
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<P>
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This subroutine initializes the PSBLAS parallel environment, defining
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a virtual parallel machine.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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</DD>
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<DT><STRONG><B>On Entry </B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>np</STRONG></DT>
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<DD>Number of processes in the PSBLAS virtual parallel machine.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer value. Default: use all available processes.
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</DD>
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<DT><STRONG>basectxt</STRONG></DT>
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<DD>the initial communication context. The new context
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will be defined from the processes participating in the initial one.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer value. Default: use MPI_COMM_WORLD.
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</DD>
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<DT><STRONG>ids</STRONG></DT>
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<DD>Identities of the processes to use for the new context; the
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argument is ignored when <code>np</code> is not specified. This allows the
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processes in the new environment to be in an order different from the
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original one.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer array. Default: use the indices <SPAN CLASS="MATH"><IMG
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WIDTH="93" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
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SRC="img96.png"
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ALT="$(0\dots np-1)$"></SPAN>.
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</DD>
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</DL>
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<P>
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<DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>icontxt</STRONG></DT>
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<DD>the communication context identifying the virtual
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parallel machine. Note that this is always a duplicate of
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<code>basectxt</code>, so that library communications are completely
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separated from other communication operations.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>required</B>.
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<BR>
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Intent: <B>out</B>.
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<BR>
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Specified as: an integer variable.
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</DD>
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</DL>
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<P>
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<BIG CLASS="LARGE"><B>Notes</B></BIG>
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<OL>
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<LI>A call to this routine must precede any other PSBLAS call.
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</LI>
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<LI>It is an error to specify a value for <SPAN CLASS="MATH"><IMG
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WIDTH="21" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img134.png"
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ALT="$np$"></SPAN> greater than the
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number of processes available in the underlying base parallel
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environment.
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</LI>
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</OL>
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