function get_mem_vals()
    local result={}
    local keys={"MemTotal","MemFree","MemAvailable","Buffers"}

    local f=assert(io.open("/proc/loadavg", "r"))
    local loadavg = f:read("*all")
    local t={}

    for k,v in loadavg:gmatch("%d+%.%d+") do table.insert(t,k) end

    result["load_1m"]=t[1]
    result["load_5m"]=t[2]
    result["load_15m"]=t[3]

    local f=assert(io.popen("grep -E '(^Mem|^Buf)' /proc/meminfo ", "r"))
    for l in f:lines() do
        for k2,v2 in pairs(keys) do
            if l:find(v2) then
                result[v2]=l:match("%d+")
            end
        end
    end

    return result
end


for _,v in pairs(get_mem_vals()) do
    print(_..": "..v)
end