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How to debug tursodb using Bytecode comparison, logging, ThreadSanitizer, deterministic simulation, and corruption analysis tools
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Basé sur la classification professionnelle SOC
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| name | debugging |
| description | How to debug tursodb using Bytecode comparison, logging, ThreadSanitizer, deterministic simulation, and corruption analysis tools |
Turso aims for SQLite compatibility. When behavior differs:
1. EXPLAIN query in sqlite3
2. EXPLAIN query in tursodb
3. Compare bytecode
├─ Different → bug in code generation
└─ Same but results differ → bug in VM or storage layer
# SQLite
sqlite3 :memory: "EXPLAIN SELECT 1 + 1;"
# Turso
cargo run --bin tursodb :memory: "EXPLAIN SELECT 1 + 1;"
cargo run --bin tursodb :memory: 'SELECT * FROM foo;'
cargo run --bin tursodb :memory: 'EXPLAIN SELECT * FROM foo;'
# Trace core during tests
RUST_LOG=none,turso_core=trace make test
# Output goes to testing/test.log
# Warning: can be megabytes per test run
Use stress tests with ThreadSanitizer:
rustup toolchain install nightly
rustup override set nightly
cargo run -Zbuild-std --target x86_64-unknown-linux-gnu \
-p turso_stress -- --vfs syscall --nr-threads 4 --nr-iterations 1000
Reproduce bugs with seed. Note: simulator uses legacy "limbo" naming.
# Simulator
RUST_LOG=limbo_sim=debug cargo run --bin limbo_sim -- -s <seed>
# Whopper (concurrent DST)
SEED=1234 ./testing/concurrent-simulator/bin/run
For WAL corruption and database integrity issues, use the corruption debug tools in scripts.
See references/CORRUPTION-TOOLS.md for detailed usage.