Questions tagged [free]
For questions about free, the command-line tool that displays the amount of free and use memory in a system. This tag shouldn’t be used for questions where free happens to be used; it’s appropriate for questions about free’s behaviour, options, sources of information, or the meaning of the information displayed by free.
34
questions
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1
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30
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Logging sum of Mem and Swap from free command output
In relation to this:
https://unix.stackexchange.com/a/754252/582781
Solution 1:
free -g -s2 | sed -u -n 's/^Mem:\s\+[0-9]\+\s\+\([0-9]\+\)\s.\+/\1/p' >> memory.log
Is there a way to add Swap to ...
0
votes
1
answer
32
views
Low memory vs total memory in "free" command
I am trying to understand the output of the free command on an AWS Linux server. For example, free -h gives:
total used free shared buff/cache available
Mem: ...
- 103
0
votes
2
answers
60
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Getting only used memory from free command every few seconds
It was explained e.g. here:
Get separate used memory info from free -m command
how to cut the output of free command. But I want to do this every few seconds and log it to a file. So I tried:
free -g -...
1
vote
0
answers
46
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DELL R730XD 256GB memory but just showed 251GB on linux with command `free -h` and `htop` , why?
A DELL R730XD server with 32GiB * 8, totaling 256GB of memory, is correctly recognized as 256GB in the BIOS. When checking the memory information using "dmidecode -t memory" in Linux, the ...
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0
answers
993
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linux drop_cache using "echo 3 > /proc/sys/vm/drop_caches" not working as expected
In our production environment we are running drop cache command echo 3 > /proc/sys/vm/drop_caches to free the RAM. But also what I found is dropping caches is not a good practice and also it won't ...
- 3
0
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0
answers
152
views
Why the numbers of "free" don't add up?
This is a side question when I try to figure out why my Ubuntu18.04 server keeps using up memory and mysql gets killed from time to time.
total used free shared buff/cache ...
- 143
-1
votes
1
answer
1k
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what is the different between Buffer Cache that displayed from free command VS the available memory [closed]
we have 463 RHEL 7.6 machines in the cluster most of then are HDFS machines ( datanode )
from free -g command we can that usually buff/cache is around 30-50 when total memory is 256G
as I know - a ...
- 12.8k
1
vote
2
answers
1k
views
Zero free swap but 56GiB free memory?
I have a CentOS7.9 system showing 56GiB free RAM (free -m) but only 1MiB free swap, and it's been in this state for three days. The original problem report was that a large (EE simulation) app keeps ...
- 11
0
votes
1
answer
484
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need RAM & SWAP Memory monitoring Threshold
I wish to setup monitoring alerts upon used memory percentage.
I had setup 0-80% used RAM as Green (good)
81-90% as yellow(acceptable)
91-95% as orange(warning)
96+ as Red(critical)
However, i see ...
- 489
0
votes
2
answers
81
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When to upgrade RAM based on free output [closed]
I have a java application that runs on a Linux server with physical memory(RAM) allocated as 12GB where I would see the normal utilization over a period of time as below.
sys> free -h
...
0
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0
answers
150
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htop command displays 996GB instead of 1024GB for RAM
I have a little issue that I can't understand.
I have 8x128GB sticks of RAM, which makes 1024GB of RAM.
But the command htop displays 996G and not 1024G as expected.
You can see the following ...
2
votes
1
answer
2k
views
Why the difference in neofetch and free (RAM) output?
wadewayne@Cheetah:~$ neofetch
MMMMMMMMMMMMMMMMMMMMMMMMMmds+. wadewayne@Cheetah
MMm----::-://////////////oymNMd+` -----------------
MMd /++ -sNMd: OS: Linux Mint 19....
- 121
0
votes
1
answer
149
views
The reason why buffers in "free -h" command output is increased
I did two experiments.
The first experiment (Ubuntu 20.04, ext4 filesystem):
Run command free -h -w:
$ free -h -w
total used free shared buffers cache ...
1
vote
1
answer
1k
views
What's the difference between memory shown with the free command and the top command? [duplicate]
I am new to running a linux server and wanted to know the difference between the total memory shown with the top command (which appears to be 78GB)
and the free command which shows that I have 743GB ...
- 348
-1
votes
1
answer
2k
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How to check memory utilization in solaris 11 machine?
May I know how to calculate total memory utilization and percent of a Solaris 11.3 machine?
Am I wrong in below calculation? or any other way?
memfree=$(vmstat 1 2 | awk '{print $5}' | tail -1)
...
0
votes
1
answer
1k
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Why is the output of free -h different from free --giga?
I am facing a very weird problem.
On my Fedora PC I have 12 GB swap file.
But when I issue free -h I get :
total used free shared buff/cache available
Mem: ...
- 1,155
-1
votes
1
answer
154
views
why free command say different from the real consuming memory
from our linux VM rhel 7.5 server with 126G memory
we have strange memory behavior that consume all available memory as the following
free -g
total used free shared ...
- 12.8k
-1
votes
1
answer
74
views
rhel + why swap memory isn't exploited
we have rhel servers with version 7.6
we configured the swap and we can see the swap size from the following
free -g
total used free shared buff/cache available
...
- 12.8k
-1
votes
1
answer
887
views
memory free space is decreasing but available is increasing
I am checking memory continuously by free command.
From three month ago. free space is decreasing continuously. From 70% to 30%, but used is not changed so much, available is getting increasing ...
- 165
0
votes
1
answer
750
views
how to check memory usage, in detail
There are commands such as top, ps, pmap (and others) that show how much memory is used by a process, but they only show the total memory.
Using the free -g command output we see total, used, shared, ...
- 756
1
vote
1
answer
341
views
Xen Server: Free memory != dmidecode -t17 output
Overview
I'm running a Xen server on Debian buster. Latest kernel, latest BIOS version, legacy boot.
Booting into Xen server only shows 8 GB of RAM free while recognizing 16 GB of RAM connected.
...
- 113
0
votes
1
answer
939
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How to install Linux free command on Mac terminal?
As the title says, I need to use the 'free' Linux command on macOS. I installed Homebrew but I cannot figure out what package I need.
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2
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2
answers
4k
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What is "effective used" memory on Linux? "used" or ("total"-"available")?
I need to display in GUI for operator used memory vs available on Linux Server
So what would be logically correct value to display as usage?
[root@host ~]# free
total used ...
- 921
-1
votes
1
answer
181
views
Which hardware is used by buffer
I know that the cache is used to store data so that future requests for that data can be served faster. Normally we have three level cache: L1, L2 and L3 in the current computer architecture. We can ...
- 3,221
1
vote
2
answers
292
views
free command - different outputs after conversion
I'm monitoring my RAM on a CentOS 6 server and when I free -h I see 15G available which is OK but when I free -b I see 1641154969 bytes which equals 1,641154969G.
free -h
total ...
0
votes
1
answer
730
views
plink command to print free|grep "Mem:"
I like to print only one "Mem:" line in the output using plink command.
plink -batch [email protected] -P 22 -pw test@123 (free;) --> working
total used free ...
- 43
0
votes
0
answers
2k
views
Difference between available, free and cached in free command [duplicate]
What is the difference between available memory and free memory. Is available memory and cached memory are same. If not, what's the difference. I have referred some answers and they says available ...
0
votes
1
answer
254
views
Why are there no values for 'shared', 'buff/cache' and 'available' in the swap line of free?
Why are the last columns empty in the swap line?
$ free
total used free shared buff/cache available
Mem: 3912864 2255460 315388 249068 1342016 ...
- 11
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votes
1
answer
1k
views
MemAvailable higher than expected
$ free -h
total used free shared buff/cache available
Mem: 7.7Gi 4.5Gi 692Mi 305Mi 2.5Gi 2.6Gi
Swap: 2.0Gi ...
- 49.3k
0
votes
1
answer
1k
views
cached memory and free command
I have a 2 cpu server running SLES 11.4 x86-64 and it has 1.5 tb of RAM.
>free -g
total used free shared buffers cached
Mem: 1514 284 ...
- 6,142
4
votes
2
answers
5k
views
Why does swappiness not work?
We have a RHEL 7 machine, with only 2G of available RAM:
free -g
total used free shared buff/cache available
Mem: 31 28 0 ...
- 12.8k
2
votes
1
answer
4k
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Devuan - how to install non-free contrib? [duplicate]
I'm on transition from Mac OS-X to Devuan. Trying to make the learning curve not as steep, I need to install some non-free software. Reading through forums, I understand there is a command that will ...
- 21
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1
answer
670
views
How can I print the memory usage in KB by free?
I need to print the RAM memory used at this time in kilobytes(KB) with command free, how can I do that with one line command
input: free ...
output: 567595
output should be contain only kilobytes ...
0
votes
1
answer
417
views
Memory immediately available in Linux memory management system
This is the output of free -h command on my Ubuntu 18.04 laptop:
$ free -hg
total used free shared buff/cache available
Mem: 11G 4,2G 3,4G ...
- 2,689