# Pi Digits Benchmark

This benchmark compares pthread-based parallelism and fork()-based parallelism
for computing digits of pi in independent chunks.

## Configuration (environment variables)

- `THREAD_COUNT`  : number of worker threads
- `PROCESS_COUNT` : number of worker processes
- `PI_DIGITS`     : total digits of pi to compute
- `CHUNK_SIZE`    : digits per worker

Defaults: `THREAD_COUNT=4`, `PROCESS_COUNT=4`, `PI_DIGITS=2000`, `CHUNK_SIZE=500`

## Run

```sh
# Run both modes sequentially
bash run_pi_digits_benchmark.sh

# Run a single mode
bash run_pi_digits_benchmark.sh thread
bash run_pi_digits_benchmark.sh process
```

## Outputs

Per-run outputs are stored under `runs/`:

- `pi_digits.txt` — final concatenated digits
- `workers.csv` — per-worker durations and chunk metadata
- `results.csv` — per-run summary metrics (includes aggregated RSS/VSZ/PSS and snapshot overhead)
- `stdout.log` / `stderr.log` — benchmark logs