Added TNL/Debugging directory

ADD_SUBDIRECTORY( Config )

ADD_SUBDIRECTORY( Containers )

ADD_SUBDIRECTORY( Debugging )

ADD_SUBDIRECTORY( Devices )

ADD_SUBDIRECTORY( Experimental )

ADD_SUBDIRECTORY( Functions )

SET( headers

         MemoryUsage.h

)

INSTALL( FILES ${headers} DESTINATION include/tnl-${tnlVersion}/TNL/Debugging )

/***************************************************************************

                          MeshConfigBase.h  -  description

                             -------------------

    begin                : Nov 6, 2016

    copyright            : (C) 2016 by Tomas Oberhuber et al.

    email                : tomas.oberhuber@fjfi.cvut.cz

 ***************************************************************************/

/* See Copyright Notice in tnl/Copyright */

#pragma once

#include <iostream>

#include <fstream>

#include <string>

#include <limits>

namespace TNL {

namespace Debugging {

/*

 * Prints memory usage of the current process into the specified stream.

 *

 * The information is obtained from /proc/self/status, which is assumed to be

 * present on the system. The meaning of the printed values is following:

 *  

 *  - VmSize: Virtual memory size.

 *  - VmRSS: Resident set size.

 *  - VmHWM: Peak resident set size ("high water mark").

 *

 * See the proc(5) manual on Linux for details.

 */

void printMemoryUsage( std::ostream& str = std::cerr )

{

   std::ifstream meminfo("/proc/self/status");

   if( meminfo.fail() ) {

      std::cerr << "error: unable to open /proc/self/status" << std::endl;

      return;

   }

   unsigned vm = 0;

   unsigned rss = 0;

   unsigned hwm = 0;

   std::string desc;

   while( meminfo.good() ) {

       // extract description (first column)

       meminfo >> desc;

       if( desc == "VmSize:" )

           meminfo >> vm;

       if( desc == "VmHWM:" )

           meminfo >> hwm;

       if( desc == "VmRSS:" )

           meminfo >> rss;

       // ignore the rest of irrelevant lines

       meminfo.ignore( std::numeric_limits< std::streamsize >::max(), '\n' );

   }

   str << "Memory usage (MiB): "

       << "VmSize = " << vm / 1024 << "MiB, "

       << "VmRSS = " << rss / 1024 << "MiB, "

       << "VmHWM = " << hwm / 1024 << "MiB, "

       << std::endl;

}

} // namespace Debugging

} // namespace TNL