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I am writing because I have no idea what going on with my favourite os, Ubuntu 15.10 with the kde desktop. The problem affect ram usage in normal work (chromium/firefox browser with few cards and flash). I have set the vm.swappiness parameter to 1. I have 8GB of ram, and after few hours of work ubuntu use 90% of ram and 4GB of swap. It can be seen below after 2 hours of work:

root@celestia-laptop:/home/mariusz# free -m
             total       used       free     shared    buffers     cached
Mem:          7866       7707        159       4230         42       4732
-/+ buffers/cache:       2932       4934
Swap:        16391        920      15471

When I switch off the swap the system is going crazy - it's very slow, and hard drive usage is 100%. Maybe somebody have solution for my problem?

The output from the df -h command:

System plików  rozm. użyte dost. %uż. zamont. na
udev            3,9G  3,9G     0 100% /dev
tmpfs           787M  9,6M  778M   2% /run
/dev/sda10       36G   20G   15G  58% /
tmpfs           3,9G   78M  3,8G   2% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
tmpfs           3,9G     0  3,9G   0% /sys/fs/cgroup
/dev/sda8        80G   76G  4,9G  94% /media/BACKUP
/dev/sda9       282G  249G   20G  93% /media/DANE
/dev/sda2        96M   32M   65M  34% /boot/efi
tmpfs           787M     0  787M   0% /run/user/115
tmpfs           787M   46M  741M   6% /run/user/1000

the output of the htop command sorted by memory: image here

After kill all of browsers processes the output from the free -m command look like this.

root@celestia-laptop:/home/mariusz# free -m
             total       used       free     shared    buffers     cached
Mem:          7866       4486       3380       3087         38       3549
-/+ buffers/cache:        899       6967
Swap:        16391       1013      15378

You can see, that ubuntu use almost 2GB of memory.

I solved the problem temporary by change default tmpfs file system from 50% to 20%. Before run the kde desktop I remount tmpfs and devfs using following commands:

mount -o remount,size=20% /dev/
mount -o remount,size=20% /dev/shm
mount -o remount,size=20% /sys/fs/cgroup

I am wonder if there is permanent way to do this.

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  • 1
    Possible duplicate of High RAM usage.
    – Weboide
    Feb 8, 2016 at 20:33
  • Can you add the output of df to your question?
    – psusi
    Feb 8, 2016 at 23:21

1 Answer 1

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Run this command

sudo top

Find out the culprint process and then kill it

sudo kill -9 <pid>

enter image description here

Also look for some of the services that might be always running. For more details, refer to this link

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  • The kill command do nothing, because this is not a solution. How can i use web browser if I kill it. But still if i kill browsers the free command looks like this: RAM: total=7866 used=4486 free=3380 shared=3087 buffers=38 cached=3549 -/+ buffers/cache: used= 899 free=6967 Swap: total=16391 used=1013 free=15378 . You can see, that ubuntu use almost 2GB of memory Feb 9, 2016 at 6:58
  • In the startup processes there is no additional programs than in clean install. I solved the problem temporary by change the default tmpfs from 50% to 20%. I don't know how but this helps and the system use 1GB of ram. Feb 10, 2016 at 18:24

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