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I am suffering from frequent lock-ups of my desktop system (see Memory full, mostly taken by "shared", GUI unresponsive).

Example output of free -m:

              total        used        free      shared  buff/cache   available
Mem:          15943        2583        3176        9063       10183        3574
Swap:             0           0           0

Why are > 9 GB taken by shared? How do I force this to be less?

fuenfundachtzig
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  • Increase the swappines! – George Udosen Dec 01 '17 at 07:32
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    swappiness won't help if Swap: 0 0 0. It appears he has no swap set up. – DavidO Dec 01 '17 at 07:35
  • @DavidO why does one setup Ubuntu xenial without swap, OP did you remove your swap or never created one? – George Udosen Dec 01 '17 at 08:37
  • @George you will have to ask the OP why he did that and how. I just made the observation that it appears he has no swap. – DavidO Dec 01 '17 at 14:41
  • @DavidO I agree with you on that just wondering why one who has no experience with Ubuntu will do such a thing rather than follow the standard setup process! – George Udosen Dec 01 '17 at 14:52
  • I have delibrately disabled swap. My question is not about swap though but about the huge amount of memory reserved as shared memory. – fuenfundachtzig Dec 01 '17 at 20:26
  • This looks interesting though: https://askubuntu.com/questions/762717/high-shmem-memory-usage?rq=1 – fuenfundachtzig Dec 01 '17 at 20:29
  • Yes, that would have been my next suggestion @fuenfundachtzig: Check df -h and see how much is being consumed by each of the tmpfs entries. On my system with 32GB RAM I have mapped /tmp to tmpfs also, so in theory I could fill my RAM and dive into swap if some process decided to spin out of control writing tempfiles. But in practice that's pretty unlikely, and even if it did happen, I wouldn't much appreciate 32G of temp files ending up on a physical drive either, so memory+swap for /tmp is a reasonable arrangement for me (and performant). – DavidO Dec 02 '17 at 16:48

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I know it won't help but for anyone who needs to fix this You should probably do it through bios Imp There should some part of ram given to igpu Go to bios Select uma buffer size and select the lowest size possible If you have option don't turn it completely off I would prefer 1 gb if you have 16gb and 512 MB if you have 8gb You can increase these as per your needs :)

Akshat Singh
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