"""The tail of the GPU rail's idle hold. n=112 was too thin to bound a 1 s wait."""
import time, statistics
exec(open('rails.py').read().split('import time, subprocess, sys')[0])

prev = sample(); last = time.perf_counter(); gaps = []
t_end = time.perf_counter() + 90.0
while time.perf_counter() < t_end:
    time.sleep(0.002)
    cur = sample()
    d = IOR.IOReportCreateSamplesDelta(prev, cur, None)
    if sum(v for _g,_sg,n,_u,v in rails(d) if n == "GPU Energy") > 0:
        now = time.perf_counter(); gaps.append((now-last)*1e3); last = now; prev = cur
gaps.sort()
n = len(gaps)
over = [g for g in gaps if g > 1000.0]
print(f"idle gaps n={n} over 90 s")
for q in (50, 90, 95, 99):
    print(f"  p{q}: {gaps[min(int(q/100*n), n-1)]:8.1f} ms")
print(f"  max: {gaps[-1]:8.1f} ms")
print(f"  gaps exceeding RAIL_EDGE_WAIT (1000 ms): {len(over)}  {[round(g) for g in over[:8]]}")