-- statusd_info.lua
-- CPU, Mem, and Swap information script
-- Written by Randall Wald
-- email: randy@rwald.com
-- Released under the GPL
--
-- Due to bug in "top b -n 1", uses "top b -n 2 -d 1|grep Cpu|tail -n 1"
-- to get information about CPU usage and "free" to get information
-- about memory and swap usage.
--
-- If this script fails, manually check the output of "top b -n 2 -d 1|grep -i cpu".
-- If it doesn't look similar to the below (in particular, if the
-- "Cpu(s):" part is differently capitalized or punctuated),
-- change the grep and the regexp in get_CPU_info() to match.
-- Cpu(s): 16.9% us, 5.1% sy, 0.0% ni, 70.8% id, 6.5% wa, 0.1% hi, 0.5% si
-- PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
-- Cpu(s): 74.5% us, 3.9% sy, 0.0% ni, 19.6% id, 0.0% wa, 0.0% hi, 2.0% si
-- PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
--
-- Available monitors:
-- %info_CPU_user Percentage of CPU used by user programs
-- %info_CPU_system Percentage of CPU used by services
-- %info_CPU_idle Percentage of CPU idle
-- %info_CPU_ni \
-- %info_CPU_wa \ Other things reported by top;
-- %info_CPU_hi / I'm not sure what they are
-- %info_CPU_si /
-- %info_RAM_total Total amount of RAM
-- %info_RAM_used Amount of RAM used
-- %info_RAM_free Amount of RAM free
-- %info_RAM_shared Amount of RAM shared
-- %info_RAM_buffers Amount of RAM in buffers
-- %info_RAM_cached Amount of RAM cached
-- %info_swap_total Total amount of swap
-- %info_swap_used Amount of swap currently used
-- %info_swap_free Amount of swap currently free
--
-- Update Interval:
-- (Note that the units are milliseconds)
local update_interval = 0.1 * 1000
-- Memory monitors need a factor:
-- b - ""
-- k - "K"
-- m - "M"
-- g - "G"
local mem_dimension = "M"
-- Defines the factor for dividing the memory amount
if mem_dimension == "" then
mem_factor = 1
elseif mem_dimension == "K" then
mem_factor = 1024
elseif mem_dimension == "M" then
mem_factor = 1024^2
else
mem_factor = 1024^3
end
local function get_CPU_info()
local f=io.popen('top b -n 2 -d 1|grep Cpu|tail -n 1','r')
local s=f:read('*all')
f:close()
local _, _,
info_CPU_user,
info_CPU_system,
info_CPU_ni,
info_CPU_idle,
info_CPU_wa,
info_CPU_hi,
info_CPU_si = string.find(s, "Cpu%(s%):%s+(%d+%.%d+%%) us,%s+(%d+%.%d+%%) sy,%s+(%d+%.%d+%%) ni,%s+(%d+%.%d+%%) id,%s+(%d+%.%d+%%) wa,%s+(%d+%.%d+%%) hi,%s+(%d+%.%d+%%) si")
return info_CPU_user.."", info_CPU_system.."", info_CPU_ni.."", info_CPU_idle.."", info_CPU_wa.."", info_CPU_hi.."", info_CPU_si..""
end
local function process_memory(value)
local memory = value / mem_factor
-- Truncate to just two digits after the decimal place
memory = string.gsub(memory,"(%d+%.%d%d)(%d*)","%1")
return memory
end
local function get_RAM_info()
local f=io.popen('free -b','r')
local s=f:read('*all')
f:close()
local _, _,
info_RAM_total,
info_RAM_used,
info_RAM_free,
info_RAM_shared,
info_RAM_buffers,
info_RAM_cached = string.find(s, "Mem:%s+(%d+)%s+(%d+)%s+(%d+)%s+(%d+)%s+(%d+)%s+(%d+)")
info_RAM_total = process_memory(info_RAM_total)
info_RAM_used = process_memory(info_RAM_used)
info_RAM_free = process_memory(info_RAM_free)
info_RAM_shared = process_memory(info_RAM_shared)
info_RAM_buffers = process_memory(info_RAM_buffers)
info_RAM_cached = process_memory(info_RAM_cached)
local _, _,
info_swap_total,
info_swap_used,
info_swap_free = string.find(s, "Swap:%s+(%d+)%s+(%d+)%s+(%d+)")
info_swap_total = process_memory(info_swap_total)
info_swap_used = process_memory(info_swap_used)
info_swap_free = process_memory(info_swap_free)
return info_RAM_total..mem_dimension, info_RAM_used..mem_dimension, info_RAM_free..mem_dimension, info_RAM_shared..mem_dimension, info_RAM_buffers..mem_dimension, info_RAM_cached..mem_dimension, info_swap_total..mem_dimension, info_swap_used..mem_dimension, info_swap_free..mem_dimension
end
local function inform_info(name, value)
if statusd ~= nil then
statusd.inform(name, value)
else
io.stdout:write(name..": "..value.."\n")
end
end
if statusd ~= nil then
status_timer = statusd.create_timer()
end
local function update_info()
local info_CPU_user, info_CPU_system, info_CPU_ni, info_CPU_idle, info_CPU_wa, info_CPU_hi, info_CPU_si = get_CPU_info()
local info_RAM_total, info_RAM_used, info_RAM_free, info_RAM_shared, info_RAM_buffers, info_RAM_cached, info_swap_total, info_swap_used, info_swap_free = get_RAM_info()
inform_info("info_CPU_user", info_CPU_user)
inform_info("info_CPU_system", info_CPU_system)
inform_info("info_CPU_ni", info_CPU_ni)
inform_info("info_CPU_idle", info_CPU_idle)
inform_info("info_CPU_wa", info_CPU_wa)
inform_info("info_CPU_hi", info_CPU_hi)
inform_info("info_CPU_si", info_CPU_si)
inform_info("info_RAM_total", info_RAM_total)
inform_info("info_RAM_used", info_RAM_used)
inform_info("info_RAM_free", info_RAM_free)
inform_info("info_RAM_shared", info_RAM_shared)
inform_info("info_RAM_buffers", info_RAM_buffers)
inform_info("info_RAM_cached", info_RAM_cached)
inform_info("info_swap_total", info_swap_total)
inform_info("info_swap_used", info_swap_used)
inform_info("info_swap_free", info_swap_free)
if statusd ~= nil then
status_timer:set(update_interval, update_info)
end
end
update_info()
