sysutil.cpp

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//////////////////////////////////////////////////////////////////////////////////////
// This file is distributed under the University of Illinois/NCSA Open Source License.
// See LICENSE file in top directory for details.
//
// Copyright (c) 2016 Jeongnim Kim and QMCPACK developers.
//
// File developed by: Jeongnim Kim, jeongnim.kim@gmail.com, University of Illinois at Urbana-Champaign
//                    Jeremy McMinnis, jmcminis@gmail.com, University of Illinois at Urbana-Champaign
//                    Mark A. Berrill, berrillma@ornl.gov, Oak Ridge National Laboratory
//                    Mark Dewing, markdewing@gmail.com, University of Illinois at Urbana-Champaign
//
// File created by: Jeongnim Kim, jeongnim.kim@gmail.com, University of Illinois at Urbana-Champaign
//////////////////////////////////////////////////////////////////////////////////////


#include "sysutil.h"
#include <string>
#include <sstream>
#include <iostream>
using std::string;
#include <time.h>
#include <sys/utsname.h>

string getHostName()
{
  utsname mysys;
  uname(&mysys);
  return std::string(mysys.nodename);
}

string getDateAndTime()
{
  time_t now;
  time(&now);
  return ctime(&now);
}

string getDateAndTime(const char* format)
{
  time_t now;
  time(&now);
  tm* now_c = localtime(&now);
  char d[32];
  strftime(d, 32, format, now_c);
  return std::string(d);
}

#ifdef __linux__
#include <sys/sysinfo.h>
#include <sys/resource.h>
#endif

size_t freemem()
{
#ifdef __linux__
  struct sysinfo si;
  sysinfo(&si);
  si.freeram += si.bufferram;
  return si.freeram;
#else
  return 0;
#endif
}

/* returns heap memory usage in KiB */
size_t memusage()
{
#ifdef __linux__
  struct rusage RU; /* heap memory usage */
  getrusage(RUSAGE_SELF, &RU);
  return RU.ru_maxrss;
#else
  return 0;
#endif
}