JMemoryUsage.cc

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#include <string>
#include <iostream>
#include <iomanip>

#include "JSystem/JShell.hh"
#include "JSystem/JSystemToolkit.hh"

#include "Jeep/JPrint.hh"
#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"


/**
 * \file
 *
 * Example program to show memory usage.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;

  int  size_B;
  int  debug;

  try {

    JParser<> zap("Example program to show memory usage.");

    zap['M'] = make_field(size_B)  =  1<<25;
    zap['d'] = make_field(debug)   =  3;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }


  using namespace JPP;


  //JShell shell;

  typedef long long int  JType_t;

  const int size = size_B / sizeof(JType_t);

  cout << "Memory usage (start)  "<< FIXED(5,2) << getMemoryUsage() << "%" << endl;


  JType_t* buffer = new JType_t[size];

  cout << "Memory usage (new)    "<< FIXED(5,2) << getMemoryUsage() << "%" << endl;


  for (int i = 0; i != size; ++i) {
    buffer[i] = i;
  }

  cout << "Memory usage (assign) "<< FIXED(5,2) << getMemoryUsage() << "%" << endl;


  delete[] buffer;

  cout << "Memory usage (delete) "<< FIXED(5,2) << getMemoryUsage() << "%" << endl;
}