# Phase 5 gate — mongo-lite vs MongoDB 8.3.7, 1g dataset / ~16k docs
# Ratio < 1.0 = mongo-lite faster. Reproduce: bash tests/e2e/compare-run.sh 1g 16k
# This run includes roadmap items 1-4 (B+tree, _id index, compressed log,
# byte storage). Compare: tests/e2e/results/phase1.txt (pre-tree baseline).

benchmark                                   mongo-lite              mongodb                 ratio
insertOne (sequential) ×200                 0.20 ms                 4.7 ms                  0.0x
bulk insert throughput                      751.9 MB/s              743.6 MB/s              1.0x
docs loaded                                 65,536                  65,536                  1.0x
createIndex({k: 1})                         66.7 ms                 76.2 ms                 0.9x
countDocuments({})                          2.6 ms                  11.2 ms                 0.2x
findOne({_id: <ObjectId>})                  0.45 ms                 0.65 ms                 0.7x
findOne({k: 500}) (indexed)                 0.54 ms                 4.6 ms                  0.1x
find({p: {$gte,$lt}}).count() (scan)        13.7 ms                 12.6 ms                 1.1x
find({}).sort({_id:-1}).limit(20)           2.3 ms                  2.0 ms                  1.1x
find({}, {proj}).limit(1000)                3.4 ms                  4.2 ms                  0.8x
aggregate $group by k                       8.1 ms                  12.3 ms                 0.7x
updateOne({_id}) ×50                        0.15 ms                 0.19 ms                 0.8x
updateMany({k: 7}, {$inc})                  1.7 ms                  6.1 ms                  0.3x
deleteOne({_id}) + insertOne                0.50 ms                 4.9 ms                  0.1x
node client RSS                             159 MB                  155 MB                  1.0x
server RSS                                  539 MB                  1313 MB
kill -9 reopen                              0.8s                    1.3s
db on disk                                  97MB                    91MB

# Item 4 (byte storage) deltas vs phase4:
#   server RSS   1979 -> 539 MB  (2.4x smaller than MongoDB; phase1 baseline
#                 2.0 GB). Documents live as canonical BSON bytes in a
#                 segmented per-collection slab (offsets in the docs map,
#                 stable across growth); the per-document ArenaAllocator and
#                 its second full Pair-tree copy are gone.
#   range-scan   22.5 -> 13.7 ms (was 1.7x slower than mongod; now parity;
#                 best run 11.2 vs 14.0). The matcher walks the stored bytes
#                 directly, skipping by length any field the filter does not
#                 name — the benchmark filter touches ~40 bytes of a 16 KiB
#                 doc — and is differential-tested against the tree matcher.
#   proj         4.1 -> 3.4 ms  (borrowed spine, no leaf copies).
#   createIndex  50.8 -> 66.7 ms (byte entry generation; parity).
#
# Remaining gaps and where they are addressed:
#   range-scan / sort / proj rows hover at parity (run noise; the phase4
#   run had range-scan at 0.8x).
#   Item 5 (decompose the global lock) is the last roadmap item: one
#   reader/writer lock covers the whole engine, held across fsync,
#   compaction and reply construction.