test/Time/cxx_main.cpp

Go to the documentation of this file.

// @HEADER
// ***********************************************************************
//
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
// @HEADER

#include "Teuchos_ConfigDefs.hpp"
#include "Teuchos_TimeMonitor.hpp"
#include "Teuchos_ScalarTraits.hpp"
#include "Teuchos_Version.hpp"
#include "Teuchos_as.hpp"

#ifdef HAVE_MPI
#include <mpi.h>
#endif

using std::string;
using Teuchos::TimeMonitor;
using Teuchos::Time;
using Teuchos::RCP;
using Teuchos::ScalarTraits;
using Teuchos::as;

/* Test of Teuchos timing classes */


/* create timers for several functions */
static Time& sqrtTimer() {static RCP<Time> t = TimeMonitor::getNewTimer("square roots"); return *t;}

static Time& factTimer() {static RCP<Time> t = TimeMonitor::getNewTimer("factorials"); return *t;}

static Time& exceptTimer() {static RCP<Time> t = TimeMonitor::getNewTimer("func with std::exception"); return *t;}

static Time& localTimer() {static RCP<Time> t = TimeMonitor::getNewTimer("a function that is not called on all procs"); return *t;}

static Time& anotherTimer() {static RCP<Time> t = TimeMonitor::getNewTimer("another func"); return *t;}

static Time& yetAnotherTimer() {static RCP<Time> t = TimeMonitor::getNewTimer("yet another func"); return *t;}

static Time& yetOneMoreTimer() {static RCP<Time> t = TimeMonitor::getNewTimer("yet one more func"); return *t;}


int main(int argc, char* argv[])
{
  bool verbose = 0;
  int procRank = 0;
  int FailedTests = 1; // This will be set to 0, if the std::exception is caught!

#ifdef HAVE_MPI 
  /* initialize MPI if we are running in parallel */
  MPI_Init(&argc, &argv);
  MPI_Comm_rank( MPI_COMM_WORLD, &procRank );
#endif      
  
  // Check for verbose flag.
  if (argc>1) if (argv[1][0]=='-' && argv[1][1]=='v') verbose = true;

  if (verbose && procRank==0)
    std::cout << Teuchos::Teuchos_Version() << std::endl << std::endl;

  try
  {

    // Prototypes???
    double sqrtFunc();
    double factFunc(int x);
    double exceptFunc();
    double localFunc();
    double anotherFunc();
    double yetAnotherFunc();
    double yetOneMoreFunc();
      
    /* time a simple function */
    for (int i=0; i<100; i++)
    {
      double x = 0.0;
      x = sqrtFunc();
      (void)x; // Not used!
    }

    /* time a reentrant function */
    for (int i=0; i<100; i++)
    {
      factFunc(100);
    }

    /* time a couple of silly functions */
    for (int i=0; i<100; i++)
    {
      anotherFunc();
      yetAnotherFunc();
      yetOneMoreFunc();
    }

    /* Time a function that will be called only on the root proc. This 
     * checks that the TimeMonitor will work properly when different
     * processors have different sets of timers. */
    if (procRank==0)
    {
      for (int i=0; i<100; i++)
      {
        double x = 0.0;
        x = localFunc();
        (void)x; // Not used!
      }
    }

    /* time a function that throws an std::exception */
    for (int i=0; i<100; i++)
    {
      double x = 0.0;
      x = exceptFunc();
      (void)x; // Not used!
    }

      
  }
  catch(std::exception& e)
  {
    if (verbose && procRank==0)
      std::cerr << "Caught std::exception [expected]:  " << e.what() << std::endl;

    // Return 0 since we caught the std::exception
    FailedTests = 0;
  }

  /* Summarize timings. This must be done before finalizing MPI  */
  TimeMonitor::format().setRowsBetweenLines(3);
  if (verbose)
    TimeMonitor::summarize();

#ifdef HAVE_MPI
  /* clean up MPI if we are running in parallel*/
  MPI_Finalize();
#endif

  if (FailedTests != 0) {
    std::cout << "End Result: TEST FAILED" << std::endl;
    return 1;
  }

  std::cout << "End Result: TEST PASSED" << std::endl;
  return FailedTests;
}


/* sum std::sqrt(x), x=[0, 10000). */
double sqrtFunc()
{
  /* construct a time monitor. This starts the timer. It will stop when leaving scope */
  TimeMonitor timer(sqrtTimer());

  double sum = 0.0;

  for (int i=0; i<10000; i++) 
  {
    TEUCHOS_TEST_FOR_EXCEPTION(ScalarTraits<double>::squareroot(as<double>(i)) > 1000.0, std::runtime_error,
      "throw an std::exception");
    sum += ScalarTraits<double>::squareroot(as<double>(i));
  }

  return sum;
}


/* compute log(factorial(x)) */
double factFunc(int x)
{
  /* construct a time monitor. This starts the timer. It will stop when leaving scope */
  TimeMonitor timer(factTimer());

  if (x==0) return 0;
  if (x==1) return 1;
  return std::log(as<double>(x))  + factFunc(x-1);
}


/* sum std::sqrt(x), x=[0, 10000). */
double exceptFunc()
{
  /* construct a time monitor. This starts the timer. It will stop when leaving scope */
  TimeMonitor timer(exceptTimer());

  double sum = 0.0;
  for (int i=0; i<10000; i++)
  {
    TEUCHOS_TEST_FOR_EXCEPTION(
      ScalarTraits<double>::squareroot(as<double>(i)) > 60.0, std::runtime_error,
      "throw an std::exception");
    sum += ScalarTraits<double>::squareroot(as<double>(i));
  }
  return sum;
}


/* sum x, x=[0, 10000). */
double localFunc()
{
  /* construct a time monitor. This starts the timer. It will stop when leaving scope */
  TimeMonitor timer(localTimer());

  double sum = 0.0;

  for (int i=0; i<10000; i++) 
  {
    sum += i;
  }

  return sum;
}


/* sum x^2, x=[0, 10000). */
double anotherFunc()
{
  /* construct a time monitor. This starts the timer. It will stop when leaving scope */
  TimeMonitor timer(anotherTimer());

  double sum = 0.0;

  for (int i=0; i<10000; i++) 
  {
    sum += i*i;
  }

  return sum;
}


/* sum x^3, x=[0, 10000). */
double yetAnotherFunc()
{
  /* construct a time monitor. This starts the timer. It will stop when leaving scope */
  TimeMonitor timer(yetAnotherTimer());

  double sum = 0.0;

  for (int i=0; i<10000; i++) 
  {
    sum += i*i*i;
  }

  return sum;
}


/* sum x+1, x=[0, 10000). */
double yetOneMoreFunc()
{
  /* construct a time monitor. This starts the timer. It will stop when leaving scope */
  TimeMonitor timer(yetOneMoreTimer());

  double sum = 0.0;

  for (int i=0; i<10000; i++) 
  {
    sum += i+1;
  }

  return sum;
}