65 lines
2.4 KiB
Markdown
65 lines
2.4 KiB
Markdown
# kv_bench (Mace vs RocksDB)
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Quick start for reproducible Mace vs RocksDB comparison. Full guide: [docs/repro.md](./docs/repro.md).
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## 5-Minute Quickstart
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1. Set your storage root (any mount path, not hardcoded to `/nvme`):
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```bash
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export KV_BENCH_STORAGE_ROOT=/path/to/your/storage/kvbench
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mkdir -p "${KV_BENCH_STORAGE_ROOT}"
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```
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2. Initialize Python env once:
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assume that kv_bench repo is located in `$HOME`
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```bash
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cd "$HOME/kv_bench/scripts"
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./init.sh
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source ./bin/activate
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cd "$HOME/kv_bench"
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```
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3. Run baseline comparison (both engines append to the same CSV):
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Default quick-baseline timing in these scripts is `WARMUP_SECS=3` and `MEASURE_SECS=5`.
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```bash
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rm -rf "${KV_BENCH_STORAGE_ROOT}/basic_mace" "${KV_BENCH_STORAGE_ROOT}/basic_rocks"
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mkdir -p "${KV_BENCH_STORAGE_ROOT}/basic_mace" "${KV_BENCH_STORAGE_ROOT}/basic_rocks"
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./scripts/mace.sh "${KV_BENCH_STORAGE_ROOT}/basic_mace" ./scripts/benchmark_results.csv
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./scripts/rocksdb.sh "${KV_BENCH_STORAGE_ROOT}/basic_rocks" ./scripts/benchmark_results.csv
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```
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4. Plot results:
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```bash
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./scripts/bin/python ./scripts/plot.py ./scripts/benchmark_results.csv ./scripts
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```
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5. Print a direct comparison table from the CSV:
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```bash
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./scripts/bin/python ./scripts/compare_baseline.py ./scripts/benchmark_results.csv
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```
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## What Is Compared
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- Comparison unit: rows with identical `workload_id`, `threads`, `key_size`, `value_size`, `durability_mode`, `read_path`
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- Fairness rule for read-heavy workloads: `get`, `scan`, and `W1`-`W6` run one GC/compaction pass after prefill and before warmup/measurement, so RocksDB is not compared with GC artificially disabled while reads may have to touch multiple SSTs
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- Throughput metric: workload-level `ops_per_sec` (higher is better)
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- Tail latency metric: workload-level `p99_us` (lower is better)
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- This is the workload-level p99 of all operations executed in that row, not per-op-type p99
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## Workloads
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- `W1`: `95%` read + `5%` update, uniform distribution
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- `W2`: `95%` read + `5%` update, Zipf distribution
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- `W3`: `50%` read + `50%` update, uniform distribution
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- `W4`: `5%` read + `95%` update, uniform distribution
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- `W5`: `70%` read + `25%` update + `5%` scan, uniform distribution
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- `W6`: `100%` scan, uniform distribution; throughput is counted by scan requests, not scanned key count
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Raw CSV path: `./scripts/benchmark_results.csv`
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## Full Reproduction
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For phase-by-phase commands, knobs, and interpretation rules, use [docs/repro.md](./docs/repro.md).
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