How to flush cache in Linux — boobo94

Hello guys,

Me again with a very interesting problem. Today I was working on some tasks as usual and I discovered that something is wrong with one of our systems and the vehicles are not updated actively. Something went wrong with the MQTT connection and that’s how I arrived to write How I found a simple UI Viewer for InfluxDB article.

While I debugged the problem I observed that the server’s RAM memory is full, but guess what, the memory used was 489640 and free memory 359256 from a total of 4GB. That’s why I came with the great idea As you can see below, the buff/cache memory is above 3GB (3189056).

$ top


top - 13:42:55 up 168 days,  5:26,  1 user,  load average: 0.00, 0.00, 0.00
Tasks: 109 total,   1 running,  67 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.3 us,  0.0 sy,  0.0 ni, 99.5 id,  0.0 wa,  0.0 hi,  0.0 si,  0.2 st
KiB Mem :  4037952 total,   359256 free,   489640 used,  3189056 buff/cache
KiB Swap:        0 total,        0 free,        0 used.  3268392 avail Mem

Check the cache memory

$ free -m

              total        used        free      shared  buff/cache   available
Mem:           3943         503         365           1        3074        3167
Swap:             0           0           0

Clear the cache memory