code.delx.au - monosys/blob - bin/mfree

   1 #!/usr/bin/env python3
   2
   3 import sys
   4
   5 def read_meminfo():
   6     f = open("/proc/meminfo")
   7     result = {}
   8     for line in f:
   9         key, value, *_ = line.split()
  10         key = key.strip(":")
  11         result[key] = int(value) * 1024
  12     return result
  13
  14 def read_zfs_arcstats():
  15     try:
  16         f = open("/proc/spl/kstat/zfs/arcstats")
  17     except FileNotFoundError:
  18         return {}
  19
  20     # skip first two lines
  21     f.readline()
  22     f.readline()
  23
  24     result = {}
  25     for line in f:
  26         key, _, value = line.split()
  27         result[key] = int(value)
  28     return result
  29
  30 def print_template(first, *rest):
  31     sys.stdout.write(first.ljust(7))
  32     for x in rest:
  33         sys.stdout.write(x.rjust(12))
  34     sys.stdout.write("\n")
  35
  36 def main():
  37     meminfo = read_meminfo()
  38     arcstats = read_zfs_arcstats()
  39
  40     mem_total = meminfo["MemTotal"]
  41     mem_free = meminfo["MemFree"]
  42     mem_cached = meminfo["Cached"] + meminfo["SReclaimable"]
  43     mem_buffers = meminfo["Buffers"]
  44     mem_shared = meminfo["Shmem"]
  45     mem_available = meminfo["MemAvailable"]
  46
  47     swap_total = meminfo["SwapTotal"]
  48     swap_free = meminfo["SwapFree"]
  49
  50     arc_total = arcstats.get("c_max", 0)
  51     arc_used = arcstats.get("size", 0)
  52
  53     calc_used = mem_total - mem_free - mem_cached - mem_buffers - arc_used
  54     calc_cache = mem_buffers + mem_cached + arc_used
  55     calc_available = mem_available + arc_used
  56
  57     def fmt(x):
  58         return str(round(x/1024/1024))
  59
  60     print_template("", "total", "used", "free", "shared", "buff/cache", "available")
  61
  62     print_template(
  63         "Mem:",
  64         fmt(mem_total),
  65         fmt(calc_used),
  66         fmt(mem_free),
  67         fmt(mem_shared),
  68         fmt(calc_cache),
  69         fmt(calc_available),
  70     )
  71     print_template(
  72         "Swap:",
  73         fmt(swap_total),
  74         fmt(swap_total - swap_free),
  75         fmt(swap_free),
  76     )
  77     if arcstats:
  78         print_template(
  79             "ZFS:",
  80             fmt(arc_total),
  81             fmt(arc_used),
  82         )
  83
  84 if __name__ == "__main__":
  85     main()
  86