So I guess inode preloading is the high phase, "open files" is ~zero
throughput, and "readahead" is moderate.

$ sudo sh -c "echo 3 > /proc/sys/vm/drop_caches"
$ sudo /sbin/ureadahead --debug
/var/lib/ureadahead/pack: created Sun, 06 Dec 2009 16:26:31 +0000 for hdd 8:5
30 inode groups, 2161 files, 4900 blocks (130092 kB)
Read pack: 0.106s
Preload ext2fs inodes: 1.499s
Open files: 3.246s
Readahead: 11.102s

-- 
throughput goes very low after a first peak
https://bugs.launchpad.net/bugs/492841
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