simple-zram-openrc.sh

#!/sbin/openrc-run

ZRAM_SIZE=96M
ZRAM_ALGO=zstd

start() {
    ebegin "Starting ${RC_SVCNAME}"
    
    modprobe zram num_devices=1
    echo ${ZRAM_ALGO} > /sys/block/zram0/comp_algorithm
    echo ${ZRAM_SIZE} > /sys/block/zram0/disksize
    mkswap /dev/zram0 > /dev/null
    swapon /dev/zram0

    eend $?
}

stop() {
    ebegin "Stopping ${RC_SVCNAME}"
    
    swapoff /dev/zram0
    modprobe -r zram

    eend $?
}

depend() {
    need localmount
}

simple-zram.sh

#!/bin/sh

ZRAM_SIZE=96M
ZRAM_ALGO=zstd

start() {
    echo "Setting up zram with ${ZRAM_SIZE} and ${ZRAM_ALGO} compression..."
    echo ${ZRAM_ALGO} > /sys/block/zram0/comp_algorithm
    echo ${ZRAM_SIZE} > /sys/block/zram0/disksize
    mkswap /dev/zram0 > /dev/null
    swapon /dev/zram0
}

stop() {
    echo "Tearing down zram..."
    swapoff /dev/zram0
    echo 1 > /sys/block/zram0/reset
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop
        sleep 1
        start
        ;;
    *)
        echo "Usage: $0 {start|stop|restart}"
        exit 1
esac