ios – iPhone中的总RAM

注意：请不要解释有关检索RAM统计信息的问题,例如有线,非活动,活动和免费.

mach_port_t host_port;  
    mach_msg_type_number_t host_size;  
    vm_size_t pagesize;  
    host_port = mach_host_self();  
    host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);  
    host_page_size(host_port,&pagesize);  
    vm_statistics_data_t vm_stat;  
    if (host_statistics(host_port,HOST_VM_INFO,(host_info_t)&vm_stat,&host_size) != KERN_SUCCESS) {  
        NSLog(@"Failed to fetch vm statistics");  
        return;  
    }    

    /* Stats in bytes */  
    self.wired = vm_stat.wire_count * pagesize / (1024 * 1024);
    self.active = vm_stat.active_count * pagesize / (1024 * 1024);
    self.inactive = vm_stat.inactive_count * pagesize / (1024 * 1024);
    self.free = vm_stat.free_count * pagesize / (1024 * 1024);
    self.used = self.active + self.inactive + self.wired;
    self.total = self.used + self.free;

结果如下：

>模拟器：总内存= 2045(我的电脑包含2GB内存).似乎是对的.
>设备(iPhone 4)：总内存= 390(should be 512).不正确.
>设备(iPhone 3GS)：总内存= 84(should be 256).不正确.

如果这是计算iDevice的TOTAL RAM的正确方法,请告诉我？