CPU is a difference between two /proc readings, and the previous one was kept
in the stream's progress_info row — so a figure depended on that value
surviving a round trip through a row other code also rewrites, and the first
pass of every producer showed a dash for a minute.
The previous reading now lives beside the stream's files, in
<streams>/<id>_.usage (tmpfs, removed with the rest of <id>_* when the stream
stops): node-local bookkeeping, like the pid file. Where there is no usable
previous reading — a producer's first pass, or a new pid after a restart — the
lifetime average stands in, as ps reports it, computed from the process's own
start time in /proc/PID/stat against /proc/uptime rather than /proc/PID's
mtime, which is only set when something first looks at the directory.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WwKmPG4RPK4cnJRAxQhPdL
A new "Resources" column between Stream Info and Actions: which process is
producing the channel (the fanout daemon's native remuxer, ffmpeg, or PHP for
the LLOD segmenter / loopback relay), the CPU it is burning and the memory it
holds. With the native remuxer now an option per stream, "what does this
channel actually cost" and "which backend is it on" are the two questions the
list could not answer.
ProcessManager reads both from /proc/PID/stat (fields 14/15 and 24, with the
page size derived rather than assumed — 64K pages are normal on arm64). CPU
there is cumulative, so a percentage needs two readings: cron:streams samples
each producer once a pass and folds cpu/mem/producer into the stream's
progress_info, carrying the previous reading in the same JSON to subtract from.
cpuPercent() returns null rather than a wild figure when the pair says nothing
— no previous sample, same instant, or a counter that went backwards because
the producer restarted. Only the node running a stream can read its own /proc,
so the sampling happens there and reaches the panel in the row the cron already
writes; MAIN just renders it.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UZP7fc2Hz36wbPmuLd9F9o
