的限制Linux系统内存条数的限制（linux内存条数）

Computer memory is one of the most important resources when deploying a system. No matter what kind of operating system it is, it has a limit to the amount of memory it can address. In Linux systems, the memory addressing limits depend on the underlying architecture of the system.

The number of memory bars that can be supported by a Linux system is limited by the position of the system’s physical address and its ability to access the underlying hardware. On 32-bit systems, it is limited to 4GiB of physical address. Therefore, on 32-bit systems a maximum of 4GiB of memory can be installed.

Likewise, 64-bit systems are limited by their ability to access hardware. The hardware capabilities of a system dictate the physical address limit, which determines the total amount of memory that can be installed on the system. For example, on some 64-bit systems, the limit is limited to 256TiB. Therefore, on such systems, a maximum of 256TiB of memory can be installed.

Further, the system’s configuration and the type of logical address used determine the number of memory bars that the system can support. Generally, configurations that use 32-bit logical addresses allow only a single memory bar. On the other hand, configurations that use 64-bit logical addresses support up to four memory bars.

Overall, limitations on the number of memory bars in a Linux system depend on the underlying architecture and configuration of the system as well as the physical and logical address sizes used by the system to access memory. On 32-bit systems, the limit is 4GiB, while on 64-bit systems, the limit depends on the system’s hardware capabilities. Furthermore, depending on the configuration and logical address size used, the system’s memory bar limit can range from a single memory bar to a maximum of four memory bars.

#include 
int main() 
{
   unsigned long mem_limit;

  /* Check for 32-bit system */
  if (sizeof(unsigned long) == 4)
    mem_limit = 4*1024*1024*1024;
  else if (sizeof(unsigned long) == 8)
    mem_limit = 256*1024*1024*1024*1024;

  printf("Maximum number of memory bars: %lu\n", mem_limit);

  return 0;
}