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perf(instances): the VM stats no longer wait a second per poll

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Each stats answer carries a signed sample of the counters, bound to the VM,
its compute and UUID. The next poll sends it back and the rates are the
averages since then; a sample from another run of the VM (domain ID),
another host CPU count or device list, or older than 30 s falls back to
one second as before. Windows are measured on the monotonic clock.

Now that a poll is cheap, the Stats tab polls every 5 s like the host
graph, the first time as soon as it opens (pollWhileVisible takes the
delay of the first request).

A counter the host reports as unsupported (-1) or that went back gives no
value instead of 0 or a jump; a NIC without a target keeps its chart, a
pool volume disk is measured, and a disk or NIC attached after the page
loaded no longer stops the other charts. Disk rates are MB/s (they were
MiB/s labelled Mb/s), network Mbit/s; the CPU tooltip names the window.
This commit is contained in:
catborise 2026-10-09 11:22:33 +03:00
parent 27f4845086
commit 24231813d7
8 changed files with 501 additions and 152 deletions
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7
static/js/poll.js
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@ -5,8 +5,9 @@
// interval ms after the previous one has finished, so a slow host does not
// pile up requests, each holding a web worker. A hidden page asks nothing;
// when it is shown again it asks at once. stop() pauses, start() resumes
// at once (for example while a tab of the page is shown).
function pollWhileVisible(interval, request, onData) {
// at once (for example while a tab of the page is shown). The first request
// goes out after firstDelay ms, the interval if it is not given.
function pollWhileVisible(interval, request, onData, firstDelay) {
var timer = null;
var running = false;
var stopped = false;
@ -34,7 +35,7 @@ function pollWhileVisible(interval, request, onData) {
}
document.addEventListener("visibilitychange", resume);
timer = setTimeout(run, interval);
timer = setTimeout(run, firstDelay === undefined ? interval : firstDelay);
return {
stop: function () {