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108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
#include <stdexcept>
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#include "common/getMemoryAmount.h"
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// http://nadeausoftware.com/articles/2012/09/c_c_tip_how_get_physical_memory_size_system
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/*
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* Author: David Robert Nadeau
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* Site: http://NadeauSoftware.com/
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* License: Creative Commons Attribution 3.0 Unported License
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* http://creativecommons.org/licenses/by/3.0/deed.en_US
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*/
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#if defined(WIN32) || defined(_WIN32)
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#include <Windows.h>
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#else
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#if defined(BSD)
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#include <sys/sysctl.h>
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#endif
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#endif
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/**
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* Returns the size of physical memory (RAM) in bytes.
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* Returns 0 on unsupported platform
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*/
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uint64_t getMemoryAmountOrZero()
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{
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#if defined(_WIN32) && (defined(__CYGWIN__) || defined(__CYGWIN32__))
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/* Cygwin under Windows. ------------------------------------ */
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/* New 64-bit MEMORYSTATUSEX isn't available. Use old 32.bit */
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MEMORYSTATUS status;
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status.dwLength = sizeof(status);
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GlobalMemoryStatus(&status);
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return status.dwTotalPhys;
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#elif defined(WIN32) || defined(_WIN32)
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/* Windows. ------------------------------------------------- */
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/* Use new 64-bit MEMORYSTATUSEX, not old 32-bit MEMORYSTATUS */
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MEMORYSTATUSEX status;
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status.dwLength = sizeof(status);
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GlobalMemoryStatusEx(&status);
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return status.ullTotalPhys;
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#else
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/* UNIX variants. ------------------------------------------- */
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/* Prefer sysctl() over sysconf() except sysctl() HW_REALMEM and HW_PHYSMEM */
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#if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
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int mib[2];
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mib[0] = CTL_HW;
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#if defined(HW_MEMSIZE)
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mib[1] = HW_MEMSIZE; /* OSX. --------------------- */
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#elif defined(HW_PHYSMEM64)
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mib[1] = HW_PHYSMEM64; /* NetBSD, OpenBSD. --------- */
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#endif
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uint64_t size = 0; /* 64-bit */
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size_t len = sizeof(size);
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if (sysctl(mib, 2, &size, &len, nullptr, 0) == 0)
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return size;
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return 0; /* Failed? */
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#elif defined(_SC_AIX_REALMEM)
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/* AIX. ----------------------------------------------------- */
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return sysconf(_SC_AIX_REALMEM) * 1024;
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#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
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/* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */
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return uint64_t(sysconf(_SC_PHYS_PAGES))
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*uint64_t(sysconf(_SC_PAGESIZE));
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#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGE_SIZE)
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/* Legacy. -------------------------------------------------- */
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return uint64_t(sysconf(_SC_PHYS_PAGES))
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* uint64_t(sysconf(_SC_PAGE_SIZE));
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#elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM))
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/* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */
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int mib[2];
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mib[0] = CTL_HW;
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#if defined(HW_REALMEM)
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mib[1] = HW_REALMEM; /* FreeBSD. ----------------- */
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#elif defined(HW_PYSMEM)
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mib[1] = HW_PHYSMEM; /* Others. ------------------ */
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#endif
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unsigned int size = 0; /* 32-bit */
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size_t len = sizeof(size);
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if (sysctl(mib, 2, &size, &len, nullptr, 0) == 0)
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return size;
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return 0; /* Failed? */
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#endif /* sysctl and sysconf variants */
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#endif
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}
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uint64_t getMemoryAmount()
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{
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auto res = getMemoryAmountOrZero();
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if (!res)
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throw std::runtime_error("Cannot determine memory amount");
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return res;
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}
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