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<A NAME="PetscGhostExchange"><H1>PetscGhostExchange</H1></A>
This functions transfers data between local and ghost storage without a predefined mapping.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
int PetscGhostExchange(MPI_Comm comm, int numGhosts, int *ghostProcs, int *ghostIndices, PetscDataType dataType,
int *firstVar, InsertMode addv, ScatterMode mode, void *locVars, void *ghostVars)
</PRE>
Collective on MPI_Comm
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B><A HREF="../Sys/comm.html#comm">comm</A> </B></TD><TD>- The communicator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>numGhosts </B></TD><TD>- The number of ghosts in this domain
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ghostProcs </B></TD><TD>- The processor from which to obtain each ghost
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ghostIndices </B></TD><TD>- The global index for each ghost
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dataType </B></TD><TD>- The type of the variables
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>firstVar </B></TD><TD>- The first variable on each processor
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>addv </B></TD><TD>- The insert mode, INSERT_VALUES or ADD_VALUES
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mode </B></TD><TD>- The direction of the transfer, SCATTER_FORWARD or SCATTER_REVERSE
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>locVars </B></TD><TD>- The local variable array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ghostVars </B></TD><TD>- The ghost variables
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
The data in ghostVars is assumed contiguous and implicitly indexed by the order of
ghostProcs and ghostIndices. The SCATTER_FORWARD mode will take the requested data
from locVars and copy it to ghostVars in the order specified by ghostIndices. The
SCATTER_REVERSE mode will take data from ghostVars and copy it to locVars.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
ghost, exchange
<BR>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Grid/GridGlobalToLocal.html#GridGlobalToLocal">GridGlobalToLocal</A>(), <A HREF="../Grid/GridLocalToGlobal.html#GridLocalToGlobal">GridLocalToGlobal</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/src/utils/ghost.c.html#PetscGhostExchange">src/sys/src/utils/ghost.c</A>
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