def check_memory_element(
label,
used,
total,
levels,
label_total="",
show_free=False,
metric_name=None,
create_percent_metric=False,
):
"""Return a check result for one memory element"""
if show_free:
show_value = total - used
show_text = " free"
else:
show_value = used
show_text = ""
infotext = "%s: %s%s - %s of %s%s" % (
label,
get_percent_human_readable(100.0 * show_value / total),
show_text,
get_bytes_human_readable(show_value, base=1024),
get_bytes_human_readable(total, base=1024),
(" %s" % label_total).rstrip(),
)
try:
mode, (warn, crit) = levels
except (ValueError, TypeError): # handle None, "ignore"
mode, (warn, crit) = "ignore", (None, None)
warn, crit, levels_text = normalize_mem_levels(mode, warn, crit, total)
state = _compute_state(used, warn, crit)
if state and levels_text:
infotext = "%s (%s)" % (infotext, levels_text)
perf = []
if metric_name:
perf.append((metric_name, used, warn, crit, 0, total))
if create_percent_metric:
scale_to_perc = 100.0 / total
perf.append((
"mem_used_percent",
used * scale_to_perc,
warn * scale_to_perc if warn is not None else None,
crit * scale_to_perc if crit is not None else None,
0,
None, # some times over 100%!
))
return state, infotext, perf
def check_memory(params, meminfo):
if isinstance(params, tuple):
params = {"levels": params}
memtotal = MemBytes(meminfo['MemTotal'])
memused = MemBytes(memtotal.kb - meminfo['MemFree'])
if "SwapFree" in meminfo:
swaptotal = MemBytes(meminfo['SwapTotal'])
swapused = MemBytes(swaptotal.kb - meminfo['SwapFree'])
perfdata = [('swap_used', swapused.bytes, None, None, 0,
swaptotal.bytes)]
else:
swaptotal = None
swapused = None
perfdata = []
# Size of Pagetable on Linux can be relevant e.g. on ORACLE
# servers with much memory, that do not use HugeTables. We account
# that for used
if 'PageTables' in meminfo:
pagetables = MemBytes(meminfo['PageTables'])
perfdata.append(('mem_lnx_page_tables', pagetables.bytes))
else:
pagetables = None
# Buffers and Cached are optional. On Linux both mean basically the same.
caches = MemBytes(meminfo.get('Buffers', 0) + meminfo.get('Cached', 0))
ramused = MemBytes(memused.kb - caches.kb)
perfdata.append(('mem_used', ramused.bytes, None, None, 0, memtotal.bytes))
perfdata.append(('mem_used_percent', 100. * ramused.bytes / memtotal.bytes,
None, None, 0, 100.))
totalused, totalused_descr = _get_total_usage(ramused, swapused,
pagetables)
infotext = check_memory_element(
totalused_descr,
totalused.bytes,
memtotal.bytes,
None,
label_total="RAM" if totalused_descr != "RAM" else "",
)[1]
# Take into account averaging
average_min = params.get("average")
if average_min:
totalused_mb_avg = get_average("mem.used.total",
time.time(),
totalused.mb,
average_min,
initialize_zero=False)
totalused_perc_avg = totalused_mb_avg / memtotal.mb * 100
infotext += ", %d min average %.1f%%" % (average_min,
totalused_perc_avg)
perfdata.append(('memusedavg', totalused_mb_avg))
comp_mb = totalused_mb_avg
else:
comp_mb = totalused.mb
# Normalize levels and check them
totalvirt = MemBytes((swaptotal.kb if swaptotal is not None else 0) +
memtotal.kb)
warn, crit = params.get("levels", (None, None))
mode = get_levels_mode_from_value(warn)
warn_mb, crit_mb, levels_text = normalize_mem_levels(
mode,
abs(warn),
abs(crit),
totalvirt.mb,
_perc_total=memtotal.mb,
render_unit=1024**2,
)
perfdata.append(('mem_lnx_total_used', totalused.bytes, warn_mb * 1024**2,
crit_mb * 1024**2, 0, totalvirt.bytes))
# Check levels
state = _compute_state(comp_mb, warn_mb, crit_mb)
if state and levels_text:
infotext = "%s (%s)" % (infotext, levels_text)
yield state, infotext, perfdata
if totalused_descr != "RAM":
yield check_memory_element(
"RAM",
ramused.bytes, # <- caches subtracted
memtotal.bytes,
None,
)
if swaptotal and swaptotal.bytes:
yield check_memory_element(
"Swap",
swapused.bytes,
swaptotal.bytes,
None,
)
if pagetables:
yield 0, "Pagetables: %s" % pagetables.render(), []
# Add additional metrics, provided by Linux.
if meminfo.get('Mapped'):
for key, label, metric in (
('Mapped', 'Mapped', 'mem_lnx_mapped'),
('Committed_AS', 'Committed', 'mem_lnx_committed_as'),
('Shmem', 'Shared', 'mem_lnx_shmem'),
):
value = MemBytes(meminfo.get(key, 0))
yield 0, "%s: %s" % (label, value.render()), [(metric, value.bytes)
]
