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comm/example/TimeMonitor/cxx_main.cpp
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00001 /*
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00005 //                    Teuchos: Common Tools Package
00006 //                 Copyright (2004) Sandia Corporation
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00010 //
00011 // Redistribution and use in source and binary forms, with or without
00012 // modification, are permitted provided that the following conditions are
00013 // met:
00014 //
00015 // 1. Redistributions of source code must retain the above copyright
00016 // notice, this list of conditions and the following disclaimer.
00017 //
00018 // 2. Redistributions in binary form must reproduce the above copyright
00019 // notice, this list of conditions and the following disclaimer in the
00020 // documentation and/or other materials provided with the distribution.
00021 //
00022 // 3. Neither the name of the Corporation nor the names of the
00023 // contributors may be used to endorse or promote products derived from
00024 // this software without specific prior written permission.
00025 //
00026 // THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
00027 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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00042 */
00043 
00044 #include "Teuchos_TimeMonitor.hpp"
00045 #include "Teuchos_Version.hpp"
00046 
00047 #ifdef HAVE_MPI
00048 #include <mpi.h>
00049 #endif
00050 
00051 using namespace Teuchos;
00052 
00053 // Global Timers
00054 RCP<Time> CompTime = TimeMonitor::getNewCounter("Computational Time");
00055 RCP<Time> FactTime = TimeMonitor::getNewCounter("Factorial Time");
00056 
00057 // Quadratic function declaration.
00058 double quadFunc( double x );
00059 
00060 // Factorial function declaration.
00061 double factFunc( int x );
00062 
00063 int main(int argc, char* argv[])
00064 {
00065   std::cout << Teuchos::Teuchos_Version() << std::endl << std::endl;
00066 
00067   int i;
00068   double x;
00069 
00070 #ifdef HAVE_MPI
00071   MPI_Init(&argc, &argv);
00072 #endif
00073 
00074   // Apply the quadratic function.
00075   for( i=-100; i<100; i++ ) {
00076     x = quadFunc( (double) i );
00077     (void)x; // Not used!
00078   }
00079 
00080   // Apply the factorial function.
00081   for( i=0; i<100; i++ ) {
00082     x = factFunc( i );
00083     (void)x; // Not used!
00084   }
00085 
00086   // Get a summary from the time monitor.
00087   TimeMonitor::summarize();
00088 
00089 #ifdef HAVE_MPI
00090   MPI_Finalize();
00091 #endif
00092   
00093   return 0;
00094 }
00095 
00096 /* Evaluate a quadratic function at point x */
00097 double quadFunc( double x )
00098 {
00099   // Construct a local time monitor, this starts the CompTime timer and will stop when leaving scope.
00100   Teuchos::TimeMonitor LocalTimer(*CompTime);
00101 
00102   // Evaluate the quadratic function.
00103   return ( x*x - 1.0 );
00104 }
00105 
00106 /* Compute the factorial of x */
00107 double factFunc( int x )
00108 {
00109   // Construct a local time monitor, this starts the FactTime timer and will stop when leaving scope.
00110   Teuchos::TimeMonitor LocalTimer(*FactTime);
00111 
00112   // Special returns for specific cases.
00113   if( x == 0 ) return 0.0;
00114   if( x == 1 ) return 1.0;
00115 
00116   // Evaluate the factorial function.
00117   return ( (double) x * factFunc(x-1) );
00118 }
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