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Trickplay sprite generation (one full-decode ffmpeg pass per file) could pin a machine: multiple agents on the same library decoded the same 4K file at once, no CPU throttling, and crashed/restarted agents orphaned ffmpeg to init (it ran the full 45-min decode to completion). Stacked orphans spiked a box to load ~140. - Single-flight lock: O_CREATE|O_EXCL .lock in the shared sidecar dir so two agents watching the same library never decode the same file twice (stale locks reclaimed after a TTL). Returns ErrTrickplayInProgress → prewarm skips, not fail. - Load gate: defer the heavy decode until 1-min load ≤ max(ratio×NumCPU, 1.5), capped at 15 min so it throttles without ever becoming a permanent off-switch on busy / small hosts. New knob library.prewarm_max_load_ratio (default 0.7). - Concurrency: trickSem caps trickplay to ONE decode at a time per agent. - CPU priority: setLowCPUPriority (nice 19) alongside the existing idle ionice. - No orphans: hardenCmd sets Setpgid + Pdeathsig=SIGKILL, with runtime.LockOSThread around the child so the kernel kills ffmpeg exactly when the agent dies (and not spuriously — golang/go#27505). Tests: single-flight/stale-reclaim, load-gate immediate/cancel, and an e2e Pdeathsig orphan-kill check. |
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| .. | ||
| ffmpeg.go | ||
| ffmpeg_download.go | ||
| ffmpeg_test.go | ||
| ffprobe.go | ||
| ffprobe_download.go | ||
| ffprobe_download_test.go | ||
| ffprobe_test.go | ||
| harden_linux_test.go | ||
| ioprio_linux.go | ||
| ioprio_other.go | ||
| lang.go | ||
| lang_test.go | ||
| sidecar.go | ||
| sidecar_test.go | ||
| trickplay.go | ||
| trickplay_lock_test.go | ||
| trickplay_test.go | ||
| types.go | ||