systeminfo.h

#pragma once

#include <cstddef>

namespace mongo {

    class SystemInfo {
    public:
        /*
          Get the amount of physical memory available on the host.

          This should only be used for "advisory" purposes, and not as a hard
          value, because this could be deceptive on virtual hosts, and because
          this will return zero on platforms that do not support it.

          @returns amount of physical memory, or zero
         */
        static size_t getPhysicalRam();

    private:
        // don't instantiate this class
        SystemInfo(); // no implementation
    };

}