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vtroc
2f71d93b3a
`make bench` printed two reports and left nothing behind but a text file, so a number could be compared with another number from the same afternoon and not much else. It now prints three and writes the run's own directory: `report.txt`, `manifest.json` and `summary.json` beside the `trace.pftrace`. Section [3/3] is the counters — the render stages, the GPU passes, and the per-frame work census. A counter nobody sampled prints MISS rather than `0.00`, and the counters and spans this build declares but this run never reached are named at the end, so a hole in the instrumentation cannot read as a fact about the workload. GPU passes overlap and resolve late, so they are never summed. `manifest.json` says what produced the number: the revision, the dirty flag, the toolchain, the profile cargo actually built under, the locked `bevy` and `wgpu`, the adapter and whether its device can time a pass, the window, the pools, the env toggles and the cache state. The build half is baked in at compile time, because asking `git` at runtime names the tree the process is standing in rather than the build. A fact nobody could read is `null`, never a plausible default. Reading that report, `preparing match audio` was the largest stage of every load — one row holding one number, which cannot tell a thousand cheap byte loops from five hundred external processes. It is the second. Section [1/3] now splits the stage by the decoder each clip took, in worker time, and counts what each one prepared, failed, held and left resident. The T5 XWMA decode goes through the artifact cache under `xwma_pcm`, keyed on every input the decode reads, so a clip is decoded once per machine rather than once per launch. A cold load still had to pay the first time: 515 `ffmpeg` processes, 18.9 s of worker time, almost none of it decoding. A worker now takes the jobs already queued and answers up to 64 clips through one process — every clip its own input and its own output, nothing concatenated — which is 1.3 s for the same bytes. Failure stays per clip: a batch `ffmpeg` refuses is re-asked one clip at a time, leaving the bad clip as the only failure. `make bench-overhead` can point at either recorder, `VAR=IW4L_PERF` or `VAR=IW4L_BENCH`; they are separate costs and each needs its own pairs. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>