* test: add FUSE database load/durability/perf benchmark
Runs MySQL (InnoDB) and SQLite with ~1GB datadirs on a SeaweedFS FUSE
mount. Two parts:
- durability: normal shutdown, kill -9, and crash-during-write all keep
every fsync-committed row (verified by integrity check + row count +
contiguous prefix + per-row CRC).
- performance: FUSE vs the same local disk. fsync/commit latency is the
dominant cost (~0.13ms -> ~1.18ms), so small transactions run ~9-12x
slower while bulk loads and warm reads stay close.
Harness is path-independent (runtime under $SEAWEED_BENCH_WORK) and only
touches its own processes on non-default ports.
* test/benchmark/fuse_db: portable to Linux + crash-safe progress
- export MYSQL_BIN; mysql_bench.py falls back to PATH when unset
- unmount via fusermount/fusermount3 (non-root Linux), then umount/diskutil
- atomic progress write (tmp+fsync+rename); treat empty progress file as 0
- reuse a single PRNG in the perf probe so RNG init doesn't skew timings
* test/benchmark/fuse_db: validate inputs, add subprocess timeout
- mysql_bench.py: 1800s timeout on mysql CLI calls; reject db names that
aren't plain identifiers (interpolated into SQL)
- sqlite_gen.py / sqlite_verify.py: allowlist journal/synchronous modes and
the verify mode so a typo can't silently weaken durability or relax checks
- run_mysql.sh: durable atomic progress write (tmp+fsync+rename), matching
sqlite_gen.py; quote $LB in both crash-test verify calls
Chris Lu