3 (page-merge-par) sort chunk 0
4 (page-merge-par) sort chunk 1
5 (page-merge-par) sort chunk 2
6 (page-merge-par) sort chunk 3
7 (page-merge-par) sort chunk 4
8 (page-merge-par) sort chunk 5
9 (page-merge-par) sort chunk 6
10 (page-merge-par) sort chunk 7
11 (page-merge-par) merge
12 (page-merge-par) verify
13 (page-merge-par) success, buf_idx=516096