[bam_sort_core] merging from 20 files and 2 in-memory blocks...
[bam_sort_core] merging from 22 files and 2 in-memory blocks...
[bam_sort_core] merging from 16 files and 2 in-memory blocks...
[bam_sort_core] merging from 22 files and 2 in-memory blocks...
[bam_sort_core] merging from 20 files and 2 in-memory blocks...
[bam_sort_core] merging from 21 files and 2 in-memory blocks...