bench-chaindb.sh times FastImportBlockFile() under each backend using a
user-supplied blk0001.dat. Wall time comes from the daemon's existing
StartupPerfLog line; peak RSS via ps sampling; datadir size via du.
Output is one CSV row per backend appended to ./bench-results.csv, plus
a stdout summary. Network is disabled during the run (-nolisten -connect=0)
so we measure only DB ingest cost.
Does not yet measure: reorg cost, network IBD speed, raw disk I/O.
LoadSnapshot path is still LevelDB-only; the harness intentionally exercises
the FastImportBlockFile rebuild instead, which works on both backends.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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