I assume I should get rid of most of the swap. I also read somewhere to increase… swappiness of zram?

  • BlinkerFluid
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    111 year ago

    Odd consideration, but… I use 16Gb of ram and I have zero swap space and I’ve never seen a freeze in the three years this system has been assembled.

    It could just be the way I tend to use my PC, light photo manipulation, some audio editing, some gaming just not AAA. I’m never stressing my system unless I’m opening a compressed file or rendering a video.

    • @[email protected]
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      31 year ago

      Odd consideration, but… I use 16Gb of ram and I have zero swap space and I’ve never seen a freeze in the three years this system has been assembled.

      You won’t see big problems until you use most of the ram, then you’re toast. Also Linux (if that’s what you’re using) prefers to have more cache at the expense of swapping out pages. There’s a lot of rarely used code on many apps that can be safely swapped out to get you more cache.

    • @[email protected]
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      21 year ago

      I used a work laptop without swap for a while and it was very anoying. RAM intensive tasks were Rust IDE integration and compilation, data engineering, …

    • Minty95
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      11 year ago

      Exactly the same for me, 26Hb, no Swap installed, never had a freeze or a problem in the two years using Arch

  • @[email protected]
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    1 year ago

    Those defaults sound pretty sensible. I have as much swap as I have RAM because I set things up to hibernate. I believe pop os has the swappiness set to 180 for using the zram.

    • @ExplodeyWolfOP
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      21 year ago

      Should I lower swap? How do I change the swappiness?

      • @wheels
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        1 year ago

        There’s some instructions here but basically:

        1. sudo apt install zram-config

        2. append to end of /etc/sysctl.conf:

          vm.swappiness = 180
          # disable swap readahead (since using zram swap)
          vm.page-cluster = 0 
          

          Can check these have been applied with cat /proc/sys/vm/page-cluster or .../swappiness

        • @ExplodeyWolfOP
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          11 year ago

          Would these settings be the same if I used the same amount of swap?

      • @[email protected]
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        11 year ago

        Have a look at this for info on swappiness. As for your swap, if it’s not causing you problems, it can’t hurt to have it.

    • @[email protected]
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      11 year ago

      If you have more than enough RAM isn’t the older suggested configuration of low swappiness + modest swap should be more performant than encouraging the system to swap more and paying the price of compression. EG if you are apt to use 8GB in normal usage 32-64GB are at this point relatively inexpensive.

  • @[email protected]
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    1 year ago

    Why would you get rid of the swap? Having swap space should never hurt. Swap can sit empty when it’s not needed, and some memory pages are rarely used, so you’ll hardly notice if they’re swapped out.

    Only too much swapping is annoying/slow. This happens if you run out of physical RAM; mostly independent of your swap size.

    You can listen to the experts here for how to fine-tune the parameters (swappiness). Linux (as most operations systems) is built with the assumption that swap > physical RAM exists. Linux can run without swap, but the kernel runs into a huge problem if RAM becomes nearly full and has to kill processes. Usually adding swap is the better option.

    • @ExplodeyWolfOP
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      21 year ago

      You know, for some reason I thought that zram was on the disk, and it isn’t. That makes a huge difference. I’ll keep the swap then!

  • @[email protected]
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    1 year ago

    Zram usually has a very high compression ratio - around 4:1 for lz4 and 6:1 for zstd. You can set zram to 40-50 GB. It will still use less than 1/2 of your ram.

    Zram has an option to write poorly compressible data to the disk instead of storing it in the ram. I would split the swap partition - 3 GB for zram writeback and rest for ordinary swap.