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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PetscLogBegin"><H1>PetscLogBegin</H1></A>
Turns on logging of objects and events. This logs flop rates and object creation and should not slow programs down too much. This routine may be called more than once.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsys.h"
PetscErrorCode PetscLogBegin(void)
</PRE>
Logically Collective over <A HREF="../Sys/PETSC_COMM_WORLD.html#PETSC_COMM_WORLD">PETSC_COMM_WORLD</A>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-log_summary </B></TD><TD>- Prints summary of flop and timing information to the
screen (for code compiled with PETSC_USE_LOG)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-log </B></TD><TD>- Prints detailed log information (for code compiled with PETSC_USE_LOG)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Usage</FONT></H3>
<PRE>
<A HREF="../Sys/PetscInitialize.html#PetscInitialize">PetscInitialize</A>(...);
<A HREF="../Profiling/PetscLogBegin.html#PetscLogBegin">PetscLogBegin</A>();
... code ...
PetscLogView(viewer); or <A HREF="../Profiling/PetscLogDump.html#PetscLogDump">PetscLogDump</A>();
<A HREF="../Sys/PetscFinalize.html#PetscFinalize">PetscFinalize</A>();
</PRE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
PetscLogView(viewer) or <A HREF="../Profiling/PetscLogDump.html#PetscLogDump">PetscLogDump</A>() actually cause the printing of
the logging information.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
log, begin
<BR>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Profiling/PetscLogDump.html#PetscLogDump">PetscLogDump</A>(), <A HREF="../Profiling/PetscLogAllBegin.html#PetscLogAllBegin">PetscLogAllBegin</A>(), PetscLogView(), <A HREF="../Profiling/PetscLogTraceBegin.html#PetscLogTraceBegin">PetscLogTraceBegin</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/logging/plog.c.html#PetscLogBegin">src/sys/logging/plog.c</A>
<BR><A HREF="./index.html">Index of all Profiling routines</A>
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