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53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#include <stdexcept>
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#include <fstream>
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#include <base/getMemoryAmount.h>
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#include <base/getPageSize.h>
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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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/** 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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int64_t num_pages = sysconf(_SC_PHYS_PAGES);
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if (num_pages <= 0)
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return 0;
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int64_t page_size = getPageSize();
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if (page_size <= 0)
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return 0;
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uint64_t memory_amount = num_pages * page_size;
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#if defined(OS_LINUX)
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// Try to lookup at the Cgroup limit
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std::ifstream cgroup_limit("/sys/fs/cgroup/memory/memory.limit_in_bytes");
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if (cgroup_limit.is_open())
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{
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uint64_t memory_limit = 0; // in case of read error
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cgroup_limit >> memory_limit;
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if (memory_limit > 0 && memory_limit < memory_amount)
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memory_amount = memory_limit;
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}
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#endif
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return memory_amount;
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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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