this post was submitted on 06 Jun 2025
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    Possibly related:

    screen shot of memory usage by app, showing Firefox using over 18GB of RAM

    I also don't understand why every chat app needs 1GB of RAM to itself.

    (page 2) 50 comments
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    [–] [email protected] 7 points 2 days ago* (last edited 2 days ago) (5 children)

    18gb is nothing, my Firefox regularly eats 70gb (30gb is the normal load I see after browser restart) 18gb is nothing, my Firefox regularly eats 70gb

    [–] [email protected] 10 points 2 days ago (1 children)

    What are you doing to poor Firefox?

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    [–] [email protected] 1 points 2 days ago (3 children)

    Wait, everyone is saying cached is part of the used memory but yours shows more cached than in use?

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    [–] [email protected] 41 points 2 days ago (1 children)

    many Linux distros are optimized to use as much available RAM as possible, free RAM is wasted RAM

    Most would still run with a lot less anyway

    [–] [email protected] 5 points 2 days ago (1 children)

    Mine was definitely not handling 16GB...

    [–] [email protected] 6 points 2 days ago (1 children)

    what do you mean? not working well with 16 gb??

    [–] [email protected] 7 points 2 days ago (6 children)

    Correct. If I had a lot of stuff open (I like to keep stuff open for when I get back to it) then the whole system was slow and would sometimes lock up completely. I needed to close things to keep it stable.

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    [–] [email protected] 30 points 2 days ago (1 children)
    [–] [email protected] 2 points 2 days ago (1 children)

    This site says Linux calls cached RAM "free" but in my screen shot it's definitely being shown as "used". I guess this is a choice of this app?

    [–] [email protected] 7 points 2 days ago (11 children)

    Most likely, try running htop or top (can't remember which is which) in a terminal.

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    [–] [email protected] 2 points 3 days ago

    It do be like that

    [–] [email protected] 26 points 3 days ago (2 children)

    Don't be confused by cached ram, be confused by the oom killer activating while you have plenty of swap and for some reason it kills the shell you ran Firefox from.

    If you want to go on a memory allocation adventure try disabling memory overcommit πŸ₯²

    [–] [email protected] 6 points 2 days ago

    systemd-oomd with its memory pressure model never really worked for me, even after configuring it to be fairly aggressive. My system still irreversibly locks up the second the memory and swap touches 100%. earlyoom with its more primitive model works much better and actually kills processes before the memory and swap hits the ceiling. Combine this with a 2x RAM size swap file and desktop Linux is finally as stable as Windows and macOS. It is just a shame that distros do not configure generous, dynamically growing, swap files and a good oom killer by default, and you have to discover this fundamental problem of the Linux kernel yourself on multiple different devices before realizing what you actually need to do to fix these random freezes.

    [–] [email protected] 7 points 3 days ago (1 children)

    If you're out of ram and using swap thats when the oom killer should be killing. Swap is not ram.

    [–] [email protected] 5 points 2 days ago (1 children)

    Unless you use zram. Compressing pages is pretty useful as an intermediate stage.

    [–] [email protected] 2 points 2 days ago

    The swap is zram in this case.

    [–] [email protected] 12 points 3 days ago

    oh i see you're also using a single tab for youtube and no other tabs

    [–] [email protected] 5 points 3 days ago

    Me when I load some big matrices

    [–] [email protected] 9 points 3 days ago (1 children)

    Most RAM Linux reports as in used is actually used as disc cache to speed up the IO.

    [–] [email protected] 4 points 2 days ago (4 children)

    Well having 64GB RAM has been a huge boost to how fast everything feels so this checks out.

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    [–] [email protected] 81 points 3 days ago* (last edited 3 days ago) (2 children)

    every chat app might use ~1GB because most of them are electron apps, which all spawn their own instance of chromium

    [–] [email protected] 8 points 2 days ago* (last edited 2 days ago)

    I love how out of every single graphics backend option they chose the chromium Chrome is known for not slowing down after 3 tabs.

    [–] [email protected] 4 points 2 days ago

    Ah that makes sense.

    [–] [email protected] 5 points 3 days ago

    I had a power surge last night, desktop didn't even flinch.

    [–] [email protected] 80 points 3 days ago* (last edited 3 days ago) (1 children)

    It's already been explained elsewhere, but the cache can be free, as needed - that's how linux works.
    There's 57+ GB available ram, yet.

    [–] [email protected] 27 points 3 days ago (2 children)

    Yip, got that now. I misunderstood, as it's different to Windows, which shows cached memory as free since it's available to apps as needed.

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