Memory usage ⚠

A partition of MemTotal: every byte is in exactly one band. `unaccounted` is what this kernel does not break out — it is not application memory, and on some hosts it is mostly GPU memory. `available` is the kernel's own reclaimable estimate and is drawn as a line over the stack, not stacked, because it overlaps free and cache.

last poll 2m 23s ago

unit: bytes · min/avg/med/max/σ/p5/p25/p75/p95 over the day window (30 h) · k/M/G step by 1024, as the graph legend's do · σ and the percentiles show '-' where the window held too few samples for them to mean anything, the cell naming how few · Δ vs the preceding equal window · a paired column sorts by either half · for another pane's numbers, open its zoom page
field — the plugin's label for the field, or its name where it gave none; the swatch is the colour the graph drew it with	cur — the newest consolidated value in the day window (30 h)	min — lowest value over the day window (30 h) — where the window is served by a coarser archive this is the true minimum, read from the RRD's own MIN archive rather than taken from the averaged rows; a field with a cdef stays on those averaged rows, since the minimum of a difference is not the difference of the minima	avg — mean of the consolidated values over the day window (30 h)	med — median of the consolidated values over the day window (30 h) — always an actual sample (the upper middle on even counts, never an interpolated value); beside avg so skew is visible at a glance	max — highest value over the day window (30 h) — where the window is served by a coarser archive this is the true maximum, read from the RRD's own MAX archive rather than taken from the averaged rows, so a spike inside one consolidated bin still shows; a field with a cdef stays on those averaged rows, since the maximum of a difference is not the difference of the maxima	σ — population standard deviation of the consolidated values over the day window (30 h) — an approximation over consolidated rows on long windows, unlike min and max, which read the RRD's own MIN/MAX archives there (except on a field with a cdef)	p5…p95 — 5th and 95th percentiles (linear interpolation) of the consolidated values over the day window (30 h) — the robust floor and ceiling beside min's and max's literal ones, for the fields where one unlucky bin is not the story; sort by either half. An approximation over consolidated rows on long windows, unlike min and max, which read the RRD's own MIN/MAX archives there (except on a field with a cdef)	p25…p75 — 25th and 75th percentiles of the consolidated values over the day window (30 h) — the box around med: half the window's samples lie between them, so the spread they show is one no single excursion can move, where σ beside them is a squared distance that skew drags around	Δ — this window's average against the preceding equal window's, as a signed percentage; consolidation may differ between the two windows on fine-rung boundaries, and a cell whose two windows came back at different resolutions says so on hover; '-' when the previous window offers no baseline — hover for why	trend (per hour) — least-squares slope of the drawn values over the day window (30 h), per hour — hover a cell for how well its line fits the rows behind it	threshold in — projected time until the stored value crosses a warning or critical bound, from a least-squares fit of the stored series; each cell is earliest plausible / point estimate / confidently expected using a ±2 standard-error prediction interval that widens further ahead; the last may be — within the four-window forecast horizon; '-' has its reason on hover	warn/crit — the values that breach this field to WARNING and to CRITICAL, in that order; hover either half for the range as configured	limits — the plugin's declared min/max: values outside this range are stored as UNKNOWN rather than clipped (rrdcreate's DS min/max); hover a cell for the exact bounds	state·since — the verdict at the last poll, and how long the field has been in it — hover the word for what it means; a steady OK has no transition on record and shows none	info — the plugin's description of the field, and its own note about a breach
anonymous ⚠ ▤	1.89G	1.11G	1.48G	1.49G	1.89G	276.10M	1.13G…1.85G	1.20G…1.75G	+24.5%	+30.86M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	Process anonymous pages (AnonPages).
file cache ▤	640.09M	436.56M	778.61M	784.55M	1.32G	168.87M	473.51M…1.08G	703.08M…875.38M	-22.4%	-5.07M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	Page cache excluding tmpfs (Cached - Shmem).
buffers ▤	109.89M	20.89M	104.14M	123.23M	207.06M	52.94M	30.07M…180.15M	46.87M…151.98M	-28.8%	-2.38M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	Block-device cache (Buffers).
tmpfs ▤	72.64M	46.89M	70.79M	61.41M	134.14M	24.95M	53.12M…130.45M	58.27M…64.59M	-21.2%	+1.13M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	tmpfs and shared memory (Shmem).
slab ▤	401.04M	336.59M	367.08M	363.20M	401.04M	24.36M	339.39M…398.49M	339.75M…393.29M	+17.7%	+2.58M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	Kernel object caches (Slab, both reclaimable halves).
kernel ▤	96.37M	88.89M	93.92M	93.39M	103.96M	2.58M	90.23M…97.96M	92.00M…96.01M	-2.3%	+180.84k	- — no threshold is configured for this field	-/-	≥ 0	OK·-	KernelStack + PageTables + Percpu. Percpu is absent before kernel 4.19 and is then 0.
swap cache ▤	57.13M	31.61M	54.38M	54.34M	60.05M	4.48M	44.84M…59.84M	52.50M…57.15M	+2.6%	-128.20k	- — no threshold is configured for this field	-/-	≥ 0	OK·-	RAM holding pages that are also in swap (SwapCached).
free ▤	158.83M	128.64M	476.55M	361.10M	1.24G	318.24M	151.43M…1.15G	212.92M…717.71M	-15.2%	-25.67M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	Unallocated (MemFree).
unaccounted ▤	346.44M	281.83M	356.25M	362.04M	399.96M	25.04M	306.40M…388.19M	342.59M…374.76M	+5.3%	-1.49M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	MemTotal minus every band above. Memory this kernel does not break out. Unknown when a band above is unknown or the bands exceed MemTotal: a residual is only meaningful once every term of it is.
available ⚠ ▤	785.96M	785.96M	1.23G	1.23G	1.63G	303.10M	813.84M…1.61G	954.68M…1.54G	-21.5%	-34.00M	- — no threshold is configured for this field	-/-	≥ 0	OK·-	MemAvailable: the kernel's estimate of what could be reclaimed under pressure.
installed ▤ (not graphed)	3.73G	3.73G	3.73G	3.73G	3.73G	0.00	3.73G…3.73G	3.73G…3.73G	+0.0%	0.00	- — no threshold is configured for this field	-/-	≥ 0	OK·-	MemTotal. Recorded, not drawn — the stack already tops out here.

dark mode inverts graph colours; field-table swatches, where shown, are inverted too so they match the curves