The hot-sweep variant of B3 writes one shared engine_state across
all policies; the isolated variant writes per-policy. Previously
slice_engine_state.py was called unconditionally and would
overwrite an isolated policy's real data with an empty slice (the
isolated policy's run-window doesn't overlap with the shared dir's
contents).
Now we check the policy directory's engine_state for any non-empty
engine_*.jsonl first; if present, use it directly; else slice from
the shared one as before.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
scripts/slice_engine_state.py filters a shared engine_*.jsonl by a
[t_start_unix, t_end_unix] window. Needed because the patched
scheduler appends to one file per engine across the whole sweep;
per-policy analysis requires the per-policy slice.
scripts/b3_analyze.sh drives the slice + joined_analysis loop for
every policy directory in a completed sweep, then aggregates one row
per policy (latency percentiles, APC, interference_index,
hotspot_index, reuse fractions, failure-cause counts) into
b3_policy_comparison.json.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
