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Database connections kept open; a click's wait is measured (#241, #245, #246)

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#241: on production, All Subscriptions' query runs in 31 ms, unread oldest-first in 30, the
feed list's count in 5, generic plans included (EXPLAIN ANALYZE, BUFFERS, read only), against
0.3-1.6 s in ipx. A new Postgres connection takes 80-330 ms to open, and a page load asks for
more than are idle: four of six slow loads came as the pool grew (3 to 6, 2 to 6, 3 to 5, 6 to
8), and 20 requests at once took a median 414 ms while the pool grew from 8 to 20. The daemon
and the directory's server now keep their whole pool open (min = max); a command such as `ipx
status`, and the tests, which share the server's 100 connections, open as they need.

#246: the page reports list_shown, the ms from asking for a list to drawing it, with the view
and filter, under the click's trace; background refreshes are not timed. Timings skip report()'s
once-a-minute limit, which is for errors in a loop. A dashboard panel and table, and the prod
check, read it.

#245: the load test's browse scenario subscribes by OPML and leaves the Directory, which is
ipx-directory's since #204, to it.

CLAUDE.md records the owner's leave to EXPLAIN (ANALYZE, BUFFERS) any query on production,
read only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ray Slakinski
2026-10-15 14:52:14 +00:00
parent 8f19d88fc9
commit 62a3241139
16 changed files with 89 additions and 30 deletions
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9
grafana/dashboard.py
View File

@@ -185,6 +185,15 @@ ts("Page response time", [loki(f'quantile_over_time(0.95, {WEB} | unwrap duratio
loki(f'max_over_time({WEB} | unwrap duration [$__interval]) by ()', ref="B", legend="slowest")],
16, w=8, unit="s", desc="A page waits on ipx's /api/page-check before it is sent.")
y += 8
# What the person waits for, from the page itself (#246): a click to the list drawn.
LIST = SEL + ' |= "\\"ev\\":\\"list_shown\\"" | json | __error__=""'
ts("A click to the list shown", [loki(f'quantile_over_time(0.95, {LIST} | unwrap ms [$__interval]) by ()', legend="95th percentile"),
loki(f'quantile_over_time(0.5, {LIST} | unwrap ms [$__interval]) by ()', ref="B", legend="median"),
loki(f'max_over_time({LIST} | unwrap ms [$__interval]) by ()', ref="C", legend="slowest")],
0, w=12, unit="ms", desc="Measured in the browser, network and drawing included. The API's part is in the click's trace.")
table("Slowest lists by view", [loki(f'topk(10, max_over_time({LIST} | unwrap ms [$__range]) by (feed, filter))', instant=True)],
12, rename={"feed": "View", "filter": "Filter", "Value": "Slowest (ms)"}, sort=[{"displayName": "Slowest (ms)", "desc": True}])
y += 8
# ---- ipx: the API it answers behind ipx-web
row("ipx: API")