#!/usr/bin/env python3
import csv
import math
from pathlib import Path

csv_path = Path('memory_eval/results/cold_start_20_runs_2026-02-25.csv')
rows = list(csv.DictReader(csv_path.open(encoding='utf-8')))
vals = sorted(float(r['elapsed_s']) for r in rows if r.get('exit_code') == '0')

if not vals:
    print('no successful samples')
    raise SystemExit(0)

def pct(vs, q):
    i = max(0, math.ceil(len(vs) * q) - 1)
    return vs[i]

p50 = pct(vals, 0.50)
p95 = pct(vals, 0.95)
print({'success_samples': len(vals), 'p50_s': round(p50, 4), 'p95_s': round(p95, 4), 'target_le_4_5s': p95 <= 4.5})