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An APS5_AB run interleaves phases A and B, and every periodic report covers the time since the previous report of its kind, so its numbers need sorting before A and B can be compared. tools/ab_split.py reads the [ab] lines and counts a [present], [gputime], [draw] pipelined or [syncwait] report for a phase only when its whole span lies inside the phase after its settled line. It prints presents per 10 s and frame time per phase, GPU busy and idle time per frame, GPU time per present (also per --program key and --class), committer, drain and hook-wait times, the A and B means, and each B phase against the mean of its neighbouring A phases, which cancels a linear drift. AI-assisted: yes