Linux How To Free Wasted Memory RAM in Buffers

We all know Linux is known for good memory management but is it really?  It seems all on its own with hardly anything running that you can come back in days or weeks and find that almost all of your RAM is used!

And many will say "no don't worry it's buffers for optimization" but it doesn't seem to help because what is in buffers is not available to use for new programs running or ones that allocate more RAM as far as I can tell.

The reason I know this is because you can see that SWAP will get used so if there was enough RAM not eaten by buffers it should be freed for new or growing memory allocations but it is not.

So how do we fix this or clear out Linux's memory buffers to free RAM?

[root@realtechtalk.com ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          3851       3738        113          0       3269        222
-/+ buffers/cache:        246       3605
Swap:         2999          0       2999

 [root@realtechtalk.com ~]# echo 3 > /proc/sys/vm/drop_caches

[root@realtechtalk.com ~]#
[root@realtechtalk.com ~]#
[root@realtechtalk.com ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          3851        146       3705          0          0          9
-/+ buffers/cache:        137       3714
Swap:         2999          0       2999

Now we can see that we have our RAM back!


Tags:

linux, ram, bufferswe, quot, buffers, optimization, doesn, programs, allocate, swap, freed, allocations, realtechtalk, cached, mem, cache, echo, proc, sys, vm, drop_caches,

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