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Posted on 12/10/2022 12:07:49 PM
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Requirements: Use the free -h command to check the memory usage, and find that the available memory is less than 1G, the system has just been installed, and it has not executed too many service programs.
Reason: buff is a write file cache, cache is a read file cache, Linux will not release the cache immediately after the cache is used, but is used to cache other information to improve IO efficiency, soIf there are too large file read and write operations, the buff/cache will become high。
In Linux, you will often encounter the problem of excessive buff/cache memory usage, especially when using cloud hosts, because many of them are virtual memory, so if buff/cache occupies too much memory, there will be very little free free memory, which will affect the use;
Typically the memory relationship is:
Normal machine: total=used+free
Virtual machine: total=used+free+buff/cache
buff/cache is a file cache caused by system reads and writes, which is not released in time, and the solution is as follows:
The value of drop_caches can be a number between 0-3, representing different meanings:
0: Do not release (system default)
1: Free the page cache
2 : to release dentries and inodes
3: Free all caches
After execution, as shown below:
(End)
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Posted on 12/11/2022 11:01:30 PM