Delta sampling over 2s returns 0-1 integer ticks for low-CPU processes
(ffmpeg copy mode ~0.3% CPU), always rounding to 0.0%. Switch to
cumulative average (total_cpu_ticks / clk_tck / elapsed) — same method
ps uses — which gives stable, accurate readings. Also show 2 decimal
places so values like 0.34% are visible.
joaquin
3a450214ab