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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PetscGatherNumberOfMessages"><H1>PetscGatherNumberOfMessages</H1></A>
Computes the number of messages a node expects to receive
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsys.h"
PetscErrorCode PetscGatherNumberOfMessages(MPI_Comm comm,const PetscMPIInt iflags[],const PetscMPIInt ilengths[],PetscMPIInt *nrecvs)
</PRE>
Collective on <A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A>
<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>comm </B></TD><TD>- Communicator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>iflags </B></TD><TD>- an array of integers of length sizeof(comm). A '1' in ilengths[i] represent a
message from current node to ith node. Optionally NULL
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ilengths </B></TD><TD>- Non zero ilengths[i] represent a message to i of length ilengths[i].
Optionally NULL.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>nrecvs </B> -number of messages received
<br>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
With this info, the correct message lengths can be determined using
<A HREF="../Sys/PetscGatherMessageLengths.html#PetscGatherMessageLengths">PetscGatherMessageLengths</A>()
<P>
Either iflags or ilengths should be provided. If iflags is not
provided (NULL) it can be computed from ilengths. If iflags is
provided, ilengths is not required.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscGatherMessageLengths.html#PetscGatherMessageLengths">PetscGatherMessageLengths</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/utils/mpimesg.c.html#PetscGatherNumberOfMessages">src/sys/utils/mpimesg.c</A>
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