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Comment on Help with understanding memory usage discrepancy

You’re an angel. I don’t know what the fuck htop is doing showing 8GB in use. For anyone else who comes across this, this is what I have. This makes the situation seem a little more grim. I have ~2GB free, ~28GB in use, and only ~3GB is cache that can be closed. For reference, I’m using ZFS and roughly 27 docker containers. It doesn’t seem like there is much room for future services to selfhost.

MemTotal:           30.5838      GB
MemFree:            1.85291      GB
MemAvailable:       4.63831      GB
Buffers:            0.00760269   GB
Cached:             3.05407      GB

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rtxn@lemmy.world ⁨1⁩ ⁨day⁩ ago
You should also look at which processes use the largest amount of memory. ZFS is weird and might allocate its cache memory as “used” instead of “cached”. See here to set its limits: forum.proxmox.com/…/limit-zfs-memory.140803/

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- a_fancy_kiwi@lemmy.world ⁨1⁩ ⁨day⁩ ago
  Assuming the info in this link is correct, ZFS is using ~20GB for ARC which makes htop’s 8GB of in use memory make sense.
  
  My results after running cat /proc/spl/kstat/zfs/arcstats:
  
  c 4 19268150979 c_min 4 1026222848 c_max 4 31765389312 size 4 19251112856
  
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Voroxpete@sh.itjust.works ⁨1⁩ ⁨day⁩ ago
Most of those containers are probably grabbing more memory than they actually need. Consider applying some resource constraints to some of them.

Dozzle is an excellent addition to your docker setup, giving you live performance graphs for all your containers. It can help a lot with fine tuning your setup.

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- irmadlad@lemmy.world ⁨23⁩ ⁨hours⁩ ago
  Most of those containers are probably grabbing more memory than they actually need.
  
  It took a bit of trial and error with Portainer, but under Runtime & Resources, you can adjust the amount of needed resources:
  
  Shared memory size
  
  Memory reservation (MB)
  
  Memory limit (MB)
  
  Maximum CPU usage
  
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  - Voroxpete@sh.itjust.works ⁨22⁩ ⁨hours⁩ ago
    You can also set these limits in your compose file, if you use compose (which you should).
    
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    irmadlad@lemmy.world ⁨21⁩ ⁨hours⁩ ago
    Sure, it’s just easier for me to tweak in Portainer. But, yeah. There are many ways to skin the cat.
    
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