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# FPR Bench CLI
Run JMH benchmarks via a single Python CLI and export JSON results.
Requires Python 3.4+.
## Run a benchmark
From the repo root:
```sh
python fpr-bench/tools/fpr_bench.py run
```
This builds the shaded JMH jar and writes results to `fpr-bench/results/`.
You will be prompted for benchmark types and common JMH settings.
Available types: `throughput`, `latency`, `common` (runs the combined bench).
## Pass JMH arguments
Use `--` to pass flags directly to JMH (this skips the menu):
```sh
python fpr-bench/tools/fpr_bench.py run -- --wi 5 -i 5 -f 5 -tu us
```
## Results location
JSON output is stored in:
```
fpr-bench/results/YYYYMMDD_HHMMSS__<tag>__<type>.json
```
If multiple types are selected, one JSON file is produced per type.
## Examples
Skip the build and use a custom tag:
```sh
python fpr-bench/tools/fpr_bench.py run --no-build --tag smoke
```
Run only latency and throughput types non-interactively:
```sh
python fpr-bench/tools/fpr_bench.py run --types latency,throughput -- --wi 3 -i 3 -f 1
```
Use custom `mvn` and `java` executables:
```sh
python fpr-bench/tools/fpr_bench.py run --mvn mvn.cmd --java java
```
If another JMH instance is detected, the tool will try to terminate it. If that
fails, it runs with `-Djmh.ignoreLock=true`.