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<A NAME="PetscSetCommWorld"><H1>PetscSetCommWorld</H1></A>
Sets a communicator to be PETSc world communicator (default is MPI_COMM_WORLD). Must call BEFORE <A HREF="../Sys/PetscInitialize.html#PetscInitialize">PetscInitialize</A>().
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsc.h"
int PetscSetCommWorld(MPI_Comm comm)
</PRE>
Collective on MPI_Comm
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B><A HREF="../Sys/comm.html#comm">comm</A> </B> -the communicator
<br>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
This routine is intended for users who need to initialize PETSc on a
subset of processors within a larger job. Thus, most users need not
call this routine.
<P>
<P>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/src/objects/pcomm.c.html#PetscSetCommWorld">src/sys/src/objects/pcomm.c</A>
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