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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.7.5 v3.7.5 docs/manualpages/Sys/PETSC_COMM_WORLD.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PETSC_COMM_WORLD"><H1>PETSC_COMM_WORLD</H1></A>
the equivalent of the MPI_COMM_WORLD communicator which represents all the processs that PETSc knows about.
<P>
Notes: By default <A HREF="../Sys/PETSC_COMM_WORLD.html#PETSC_COMM_WORLD">PETSC_COMM_WORLD</A> and MPI_COMM_WORLD are identical unless you wish to
run PETSc on ONLY a subset of MPI_COMM_WORLD. In that case create your new (smaller)
communicator, call it, say comm, and set <A HREF="../Sys/PETSC_COMM_WORLD.html#PETSC_COMM_WORLD">PETSC_COMM_WORLD</A> = comm BEFORE calling
<A HREF="../Sys/PetscInitialize.html#PetscInitialize">PetscInitialize</A>(), but after MPI_Init() has been called.
<P>
The value of <A HREF="../Sys/PETSC_COMM_WORLD.html#PETSC_COMM_WORLD">PETSC_COMM_WORLD</A> should never be USED/accessed before <A HREF="../Sys/PetscInitialize.html#PetscInitialize">PetscInitialize</A>()
is called because it may not have a valid value yet.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PETSC_COMM_SELF.html#PETSC_COMM_SELF">PETSC_COMM_SELF</A>
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../include/petscsys.h.html#PETSC_COMM_WORLD">include/petscsys.h</A>
<BR><A HREF="./index.html">Index of all Sys routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/sys/classes/viewer/examples/tutorials/ex1.c.html">src/sys/classes/viewer/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/sys/classes/viewer/examples/tutorials/ex2.c.html">src/sys/classes/viewer/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/sys/classes/viewer/examples/tutorials/ex1f90.F90.html">src/sys/classes/viewer/examples/tutorials/ex1f90.F90.html</A><BR>
<A HREF="../../../src/sys/classes/random/examples/tutorials/ex1.c.html">src/sys/classes/random/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/sys/classes/random/examples/tutorials/ex2.c.html">src/sys/classes/random/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/sys/examples/tutorials/ex1.c.html">src/sys/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/sys/examples/tutorials/ex2.c.html">src/sys/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/sys/examples/tutorials/ex4.c.html">src/sys/examples/tutorials/ex4.c.html</A><BR>
<A HREF="../../../src/sys/examples/tutorials/ex5.c.html">src/sys/examples/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/sys/examples/tutorials/ex9.c.html">src/sys/examples/tutorials/ex9.c.html</A><BR>
<A HREF="../../../src/sys/examples/tutorials/ex11.c.html">src/sys/examples/tutorials/ex11.c.html</A><BR>
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