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rychlovka – jednorazovy swap

7 komentárov

Vcera som instaloval OraDB a check na konci mi vypisal nedostatocnu swap – o 6MB (!!!). Uz som sa videl v mrakotach, ako to cele ukoncim a prostrednictvom parted budem presuvat oddiely na disku, ale je aj ina cesta, ako instalator osalit a dodatocne mu podsunut nejaku “fakeswap” naviac.

1. prazdny subor

dd if=/dev/zero of=/fakeswap bs 512 count 100

2. subor bude pridany do swapu

mkswap /fakeswap

swapon /fakeswap

píše: ďobo

June 3rd, 2015 o 11:23 pm

chlievik: linux

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7 odpovedí to 'rychlovka – jednorazovy swap'

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  1. dd if=/dev/zero of=/fakeswap bs=512 count=100

    syntax error

    20 Jan 18 at 9:37

  2. #!/bin/bash

    free_mem=”$(free | grep ‘Mem:’ | awk ‘{print $7}’)”
    used_swap=”$(free | grep ‘Swap:’ | awk ‘{print $3}’)”

    echo -e “Free memory:\t$free_mem kB ($((free_mem / 1024)) MiB)\nUsed swap:\t$used_swap kB ($((used_swap / 1024)) MiB)”
    if [[ $used_swap -eq 0 ]]; then
    echo “Congratulations! No swap is in use.”
    elif [[ $used_swap -lt $free_mem ]]; then
    echo “Freeing swap…”
    sudo swapoff -a
    sudo swapon -a
    else
    echo “Not enough free memory. Exiting.”
    exit 1
    fi

    Eliah Kagan

    15 Mar 18 at 13:40

  3. https://leizhilong.github.io/blog/2018-11-12-case-study-swapoff-cannot-allocate-memory/

    dobo

    30 Oct 19 at 3:38

  4. Co je to swappiness masinky a jak sa to meni
    https://www.howtoforge.com/tutorial/linux-swappiness/

    dobo

    28 Nov 19 at 8:45

  5. pidof memcached —> da PID procesu, ktory swapuje
    awk ‘/VmSwap/{print $2 ” ” $3}’ /proc/PID/status —> info o pameti toho procesu

    dobo

    4 Sep 20 at 10:33

  6. for file in /proc/*/status ; do awk ‘/VmSwap|Name/{printf $2 ” ” $3}END{ print “”}’ $file; done | sort -k 2 -n -r | less
    sorting all processes according swap use

    Nikki Sixx

    4 Sep 20 at 10:36

  7. Hm. Zaujímavou a prekvapivou fičúrou Elasticsearchu je to, že sa defaultne vypína swap na nodoch. Je totižto z hľadiska stability a výkonu výhodnejšie, keď padne celý node distribuovaného elasticu, než aby pameť spadla do swapu…
    https://www.elastic.co/guide/en/elasticsearch/reference/7.8/setup-configuration-memory.html

    dobo

    18 Nov 20 at 18:43

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