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0001 /*
0002  * Author:  David Robert Nadeau
0003  * Site:    http://NadeauSoftware.com/
0004  * License: Creative Commons Attribution 3.0 Unported License
0005  *          http://creativecommons.org/licenses/by/3.0/deed.en_US
0006  */
0007 
0008 //http://nadeausoftware.com/articles/2012/07/c_c_tip_how_get_process_resident_set_size_physical_memory_use
0009 
0010 #if defined(_WIN32)
0011 #include <windows.h>
0012 #include <psapi.h>
0013 
0014 #elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
0015 #include <unistd.h>
0016 #include <sys/resource.h>
0017 
0018 #if defined(__APPLE__) && defined(__MACH__)
0019 #include <mach/mach.h>
0020 
0021 #elif (defined(_AIX) || defined(__TOS__AIX__)) || (defined(__sun__) || defined(__sun) || defined(sun) && (defined(__SVR4) || defined(__svr4__)))
0022 #include <fcntl.h>
0023 #include <procfs.h>
0024 
0025 #elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
0026 #include <stdio.h>
0027 
0028 #endif
0029 
0030 #else
0031 #error "Cannot define getPeakRSS( ) or getCurrentRSS( ) for an unknown OS."
0032 #endif
0033 
0034 
0035 
0036 
0037 
0038 /**
0039  * Returns the peak (maximum so far) resident set size (physical
0040  * memory use) measured in bytes, or zero if the value cannot be
0041  * determined on this OS.
0042  */
0043 size_t getPeakRSS( )
0044 {
0045 #if defined(_WIN32)
0046     /* Windows -------------------------------------------------- */
0047     PROCESS_MEMORY_COUNTERS info;
0048     GetProcessMemoryInfo( GetCurrentProcess( ), &info, sizeof(info) );
0049     return (size_t)info.PeakWorkingSetSize;
0050 
0051 #elif (defined(_AIX) || defined(__TOS__AIX__)) || (defined(__sun__) || defined(__sun) || defined(sun) && (defined(__SVR4) || defined(__svr4__)))
0052     /* AIX and Solaris ------------------------------------------ */
0053     struct psinfo psinfo;
0054     int fd = -1;
0055     if ( (fd = open( "/proc/self/psinfo", O_RDONLY )) == -1 )
0056         return (size_t)0L;      /* Can't open? */
0057     if ( read( fd, &psinfo, sizeof(psinfo) ) != sizeof(psinfo) )
0058     {
0059         close( fd );
0060         return (size_t)0L;      /* Can't read? */
0061     }
0062     close( fd );
0063     return (size_t)(psinfo.pr_rssize * 1024L);
0064 
0065 #elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
0066     /* BSD, Linux, and OSX -------------------------------------- */
0067     struct rusage rusage;
0068     getrusage( RUSAGE_SELF, &rusage );
0069 #if defined(__APPLE__) && defined(__MACH__)
0070     return (size_t)rusage.ru_maxrss;
0071 #else
0072     return (size_t)(rusage.ru_maxrss * 1024L);
0073 #endif
0074 
0075 #else
0076     /* Unknown OS ----------------------------------------------- */
0077     return (size_t)0L;          /* Unsupported. */
0078 #endif
0079 }
0080 
0081 
0082 
0083 
0084 
0085 /**
0086  * Returns the current resident set size (physical memory use) measured
0087  * in bytes, or zero if the value cannot be determined on this OS.
0088  */
0089 size_t getCurrentRSS( )
0090 {
0091 #if defined(_WIN32)
0092     /* Windows -------------------------------------------------- */
0093     PROCESS_MEMORY_COUNTERS info;
0094     GetProcessMemoryInfo( GetCurrentProcess( ), &info, sizeof(info) );
0095     return (size_t)info.WorkingSetSize;
0096 
0097 #elif defined(__APPLE__) && defined(__MACH__)
0098     /* OSX ------------------------------------------------------ */
0099     struct mach_task_basic_info info;
0100     mach_msg_type_number_t infoCount = MACH_TASK_BASIC_INFO_COUNT;
0101     if ( task_info( mach_task_self( ), MACH_TASK_BASIC_INFO,
0102         (task_info_t)&info, &infoCount ) != KERN_SUCCESS )
0103         return (size_t)0L;      /* Can't access? */
0104     return (size_t)info.resident_size;
0105 
0106 #elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
0107     /* Linux ---------------------------------------------------- */
0108     long rss = 0L;
0109     FILE* fp = NULL;
0110     if ( (fp = fopen( "/proc/self/statm", "r" )) == NULL )
0111         return (size_t)0L;      /* Can't open? */
0112     if ( fscanf( fp, "%*s%ld", &rss ) != 1 )
0113     {
0114         fclose( fp );
0115         return (size_t)0L;      /* Can't read? */
0116     }
0117     fclose( fp );
0118 
0119     if ((size_t)rss > std::numeric_limits<size_t>::max()/(size_t)sysconf( _SC_PAGESIZE))
0120         return std::numeric_limits<size_t>::max();
0121     else
0122         return (size_t)rss * (size_t)sysconf( _SC_PAGESIZE);
0123 
0124 #else
0125     /* AIX, BSD, Solaris, and Unknown OS ------------------------ */
0126     return (size_t)0L;          /* Unsupported. */
0127 #endif
0128 }