Reading performance counters using LuaJIT and libstatsgrab

output

ksmith@abelson:build/(master✗) $ time dev/bin/loom_client ../demos/stats.lua
Host Info  
---------------------------------  
  os_name: Linux  
  os_release: 3.13.0-30-generic  
  uptime: 3119735LL  
  bit_width: 64  
  max_cpus: 8  
  cpus: 8  
  os_version: #55-Ubuntu SMP Fri Jul 4 21:40:53 UTC 2014  
  host_name: abelson.home  
  platform: x86_64  
  host_state: physical_host
  
Load Stats  
---------------------------------  
  avg_5min: 0.01  
  avg_15min: 0.05  
  avg_1min: 0  
  
Memory Stats  
---------------------------------  
  cache: 1790578688ULL  
  total: 33628286976ULL  
  free: 31328247808ULL  
  used: 2300039168ULL  
  
CPU Stats  
---------------------------------  
  soft_interrupts: 132271286ULL  
  user: 358038ULL  
  interrupts: 108911752ULL  
  iowait: 94104ULL  
  context_switches: 352637233ULL  
  swap: 0ULL  
  involuntary_conext_switches: 0ULL  
  voluntary_context_switches: 0ULL  
  total: 2495384026ULL  
  syscalls: 0ULL  
  idle: 2494145137ULL  
  nice: 43915ULL  
  kernel: 836936ULL  
  
CPU %  
---------------------------------  
  swap: 0  
  iowait: 0.0037711229622178  
  user: 0.014348012020175  
  idle: 99.950352771874  
  nice: 0.0017598493675698  
  kernel: 0.033539366737936
  
  dev/bin/loom_client ../demos/stats.lua  0.01s user 0.00s system 92% cpu 0.014 total
  >

stats.lua

local SEPARATOR = "---------------------------------"

local function print_stats(title, stats)
  print(string.format("%s\n%s", title, SEPARATOR))
  for k, v in pairs(stats) do
    print(string.format("  %s: %s", k, v))
  end
end

local pmon = require("perfmon/perfmon")
print_stats("Host Info", pmon:host_info())
print_stats("Load Stats", pmon:load_stats())
print_stats("Memory Stats", pmon:memory_stats())
cpu_stats = pmon:cpu_stats()
print_stats("CPU Stats", cpu_stats)
print_stats("CPU %", pmon:cpu_percentages(cpu_stats))