File indexing completed on 2024-05-05 03:48:22 

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