FairSystemInfo.cxx

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/********************************************************************************
 *    Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
 *                                                                              *
 *              This software is distributed under the terms of the             *
 *              GNU Lesser General Public Licence (LGPL) version 3,             *
 *                  copied verbatim in the file "LICENSE"                       *
 ********************************************************************************/
/*
 * FairSystemInfo.cxx
 *
 *  Created on: Mar 18, 2015
 *      Author: f.uhlig
 */

#include "FairSystemInfo.h"

#include <sys/resource.h>
#include <unistd.h>

#if defined(__APPLE__) && defined(__MACH__)
#include <mach/mach.h>

#elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
#include <limits>
#include <stdio.h>

#else
#error "Unknown OS."
#endif

Float_t FairSystemInfo::GetMaxMemory()
{
    // Returns the maximal used memory in MB

    struct rusage rusage;
    getrusage(RUSAGE_SELF, &rusage);

#if defined(__APPLE__) && defined(__MACH__)
    return static_cast<Float_t>(rusage.ru_maxrss) / (1024 * 1024);
#else
    return static_cast<Float_t>(rusage.ru_maxrss) / 1024;
#endif
}

size_t FairSystemInfo::GetCurrentMemory()
{
#if defined(__APPLE__) && defined(__MACH__)
    /* OSX ------------------------------------------------------ */
    struct mach_task_basic_info info;
    mach_msg_type_number_t infoCount = MACH_TASK_BASIC_INFO_COUNT;
    if (task_info(mach_task_self(), MACH_TASK_BASIC_INFO, reinterpret_cast<task_info_t>(&info), &infoCount)
        != KERN_SUCCESS)
        //        (task_info_t)&info, &infoCount ) != KERN_SUCCESS )
        return static_cast<size_t>(0L); /* Can't access? */
    return static_cast<size_t>(info.resident_size);

#elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
    /* Linux ---------------------------------------------------- */
    long rss = 0L;
    long pagesize = sysconf(_SC_PAGESIZE);
    FILE* fp = NULL;
    if ((fp = fopen("/proc/self/statm", "r")) == NULL)
        return (size_t)0L; /* Can't open? */
    if (fscanf(fp, "%*s%ld", &rss) != 1) {
        fclose(fp);
        return (size_t)0L; /* Can't read? */
    }
    fclose(fp);
    if (rss > 0 && rss < std::numeric_limits<std::size_t>::max() / pagesize) {
        return (size_t)rss * (size_t)sysconf(_SC_PAGESIZE);
    } else {
        return (size_t)0L;
    }

#else
    /* AIX, BSD, Solaris, and Unknown OS ------------------------ */
    return (size_t)0L; /* Unsupported. */
#endif
}