Linuxfree command build check memory status

When the front-end time finds that the physical memory usage of the blog server is too high, it is to use the linuxfree command to check. this time, we will introduce this command in detail. Command

When the front-end time finds that the physical memory usage of the blog server is too high, it is to use the linux free command to check. this time, we will introduce this command in detail.

Command:Free

Function description:Displays the memory status.

Syntax:Free [-bkmotV] [-s <间隔秒数> ]

Note: The free command displays the memory usage, including the physical memory, virtual swap file memory, shared memory segments, and the system core buffer.

Parameters:
-B displays memory usage in bytes.
-K displays memory usage in KB.
-MB: memory usage is displayed in MB.
-O does not display the buffer adjustment column.
-S <间隔秒数> Observe the memory usage continuously.
-T: displays the total memory column.
-V displays the version information.

In linux, the free check result is as follows:

Mem: physical memory statistics

Total: total physical memory (total = used + free)

Used: indicates the total quantity allocated to the cache (including buffers and cache), but some of the caches are not actually used.

Free: unallocated memory.

Shared: shared Memory, which is generally not used by the system.

Buffers: Number of buffers allocated by the system but not used.

 

Cached: number of cache allocated by the system but not used.

-/+ Buffers/cache: indicates the cache statistics of physical memory.

-Buffers/cache memory: 95 (equivalent to 1st rows of used-buffers-cached)
+ Buffers/cache memory: 32 (equal to 1st rows free + buffers + cached)

Swap partition, that is, virtual memory, is generally not used.

The usage of the linux free command is summarized here.