munin-rs

Pressure stall

Share of wall time tasks spent stalled on a resource, derived from the cumulative total= counters in /proc/pressure. `some` means at least one task was stalled, `full` means every runnable task was. The CPU full line is omitted: the kernel documents it as meaningless at system scope.

last poll ago

day↓ PNG↓ SVG
Pressure stall (day) expected range trend
week↓ PNG↓ SVG
Pressure stall (week) expected range trend
month↓ PNG↓ SVG
Pressure stall (month) expected range — no archive holds 7200-second samples across the 5284986 seconds this window needs trend
year↓ PNG↓ SVG
Pressure stall (year) expected range — no archive holds 7200-second samples across the 36993786 seconds this window needs trend ✓
unit: % of time stalled · min/avg/med/max/σ/p5/p25/p75/p95 over the day window (30 h) · cur and every statistic beside it are what the graph draws; warn and crit stay the stored values the limits engine compares · 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
CPU ▤ 2.12044 1.290582.676322.109613.4209 1.53121 1.59214…4.92204 1.99786…2.90575 +13.0% +0.0437267 - — no threshold is configured for this field -/- ≥ 0 OK·- Share of time at least one task was stalled waiting for CPU.
memory (some) ▤ 0.0110182 00.01907630.001318390.718761 0.0668788 0.000000658056…0.0772184 0.0000586658…0.0112634 +64.8% +0.00060006 - — no threshold is configured for this field -/- ≥ 0 OK·- Share of time at least one task was stalled reclaiming or waiting for memory.
memory (full) ▤ 0.00862704 00.01448030.0007110.608282 0.0561926 0.000000658056…0.0625643 0.0000157167…0.00759607 +63.4% +0.000436339 - — no threshold is configured for this field -/- ≥ 0 OK·- Share of time every runnable task was stalled on memory at once.
I/O (some) ▤ 0.0915281 0.05716680.2130510.088468713.7332 0.93238 0.0654685…0.283601 0.0755518…0.103199 +2.1% -0.000495621 - — no threshold is configured for this field -/- ≥ 0 OK·- Share of time at least one task was stalled waiting on I/O.
I/O (full) ▤ 0.074637 0.03581770.1716980.074641910.8447 0.739726 0.0553968…0.2167 0.0644052…0.086309 -1.2% -0.000415752 - — no threshold is configured for this field -/- ≥ 0 OK·- Share of time every runnable task was stalled on I/O at once.

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