Batch executor: the round's fewest-left marks at the end of Batch: put after spare_count they moved its large arrays and knapsack ran 7% slower at the same instructions (8.79 against 8.29 ms), at its end about 2% (8.45); research 139's afterword: 026 not taken heavily (the user's word), the one light cut made (a nested count loop's rounds sweeping only when few lanes are left: matmul 25.85 to 24.3 ms), the walk loops kept sweeping each round (held, BFS's batches ran out), and the stop; 041 runs of b21

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+{"version":"b21","way":"batches","work":"bfs","instructions":3358270636,"cycles":1671437937}
+{"version":"b21","way":"rounds","work":"bfs","instructions":4715634135,"cycles":2107076767}
+{"version":"b21","way":"batches","work":"knapsack","instructions":348467375,"cycles":108390825}
+{"version":"b21","way":"rounds","work":"knapsack","instructions":21688103174,"cycles":7534541074}
+{"version":"b21","way":"batches","work":"matmul","instructions":712374642,"cycles":232990099}
+{"version":"b21","way":"rounds","work":"matmul","instructions":21436716472,"cycles":6627605709}
+{"version":"b21","way":"batches","work":"roots","instructions":157587236,"cycles":109712806}
+{"version":"b21","way":"rounds","work":"roots","instructions":2755945502,"cycles":988043831}
+{"version":"b21","way":"batches","work":"join","instructions":1790209421,"cycles":1115187719}
+{"version":"b21","way":"rounds","work":"join","instructions":7669661644,"cycles":3460540079}