There is something wrong with linux memory.

Hello, prawns! 

   free -m:

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topfree
nmonCommit_ASActive
================================================================
/proc/meminfo:
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in https://blog.famzah.net/2014/., the author mentions a formula: MemTotal = MemFree + Buffers + Cached + SwapCached + AnonPages + Slab + PageTables + KernelStack

as a result, I calculated that the sum of those values is almost 500MB less than that of memtotal. Has anyone ever seen such a phenomenon?

Memory centos linux
Mar.31,2021
In the same case as

, the boot of 4GB soared to 3.7GB centos7.4, which could not be detected by the top. Later, the situation alleviated after re-mount sdb1 (it should not be directly related to); ps aux to find that python2 systemd is in use. Now it takes up about 1.5GB, free 2.5G, which is acceptable

.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1be4a50-31718.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be4a50-31718.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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