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<A NAME="PetscGlobalSum"><H1>PetscGlobalSum</H1></A>
Computes the sum over sever processors
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsc.h"
int PetscGlobalSum(PetscScalar* local,PetscScalar* result,MPI_Comm comm)
</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>local </B></TD><TD>- the local value
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B><A HREF="../Sys/comm.html#comm">comm</A> </B></TD><TD>- the processors that find the sum
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>result </B> -the sum
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
These functions are to be used inside user functions that are to be processed with
ADIC. PETSc will automatically provide differentiated versions of these functions
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscGlobalMin.html#PetscGlobalMin">PetscGlobalMin</A>(), <A HREF="../Sys/PetscGlobalMax.html#PetscGlobalMax">PetscGlobalMax</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/src/objects/pinit.c.html#PetscGlobalSum">src/sys/src/objects/pinit.c</A>
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