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example/TimeMonitor/cxx_main.cpp
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00001 /*
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00005 //                    Teuchos: Common Tools Package
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00012 // modification, are permitted provided that the following conditions are
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00014 //
00015 // 1. Redistributions of source code must retain the above copyright
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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
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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   }
00078 
00079   // Apply the factorial function.
00080   for( i=0; i<100; i++ ) {
00081     x = factFunc( i );
00082   }
00083 
00084   // Get a summary from the time monitor.
00085   TimeMonitor::summarize();
00086 
00087 #ifdef HAVE_MPI
00088   MPI_Finalize();
00089 #endif
00090   
00091   return 0;
00092 }
00093 
00094 /* Evaluate a quadratic function at point x */
00095 double quadFunc( double x )
00096 {
00097   // Construct a local time monitor, this starts the CompTime timer and will stop when leaving scope.
00098   Teuchos::TimeMonitor LocalTimer(*CompTime);
00099 
00100   // Evaluate the quadratic function.
00101   return ( x*x - 1.0 );
00102 }
00103 
00104 /* Compute the factorial of x */
00105 double factFunc( int x )
00106 {
00107   // Construct a local time monitor, this starts the FactTime timer and will stop when leaving scope.
00108   Teuchos::TimeMonitor LocalTimer(*FactTime);
00109 
00110   // Special returns for specific cases.
00111   if( x == 0 ) return 0.0;
00112   if( x == 1 ) return 1.0;
00113 
00114   // Evaluate the factorial function.
00115   return ( (double) x * factFunc(x-1) );
00116 }
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