yamt-pagecache vs yamt-pagecache-base3 (latest)
reboots were done before each run
the /obj and /release directories were deleted before the reboots
the build was kicked off from /etc/rc.local to avoid other factors.
build.sh -j16 -m amd64 -O /obj -R /release release
The same build tree was used on each run.

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yamt-pagecache-base3

run1
make release started at:  Mon Jan  9 13:10:48 PST 2012
make release finished at: Mon Jan  9 13:45:24 PST 2012
35:36

run2
make release started at:  Mon Jan  9 14:41:10 PST 2012
make release finished at: Mon Jan  9 15:15:36 PST 2012
36:26

make release started at:  Mon Jan  9 17:56:07 PST 2012
make release finished at: Mon Jan  9 18:30:35 PST 2012
34:28

run4
make release started at:  Mon Jan  9 18:38:43 PST 2012
make release finished at: Mon Jan  9 19:13:13 PST 2012
35:30

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yamt-pagecache

run1
make release started at:  Mon Jan  9 15:26:26 PST 2012
make release finished at: Mon Jan  9 16:00:55 PST 2012
34:29

run2
make release started at:  Mon Jan  9 16:17:08 PST 2012
make release finished at: Mon Jan  9 16:51:34 PST 2012
34:26

run3
make release started at:  Mon Jan  9 17:16:13 PST 2012
make release finished at: Mon Jan  9 17:50:52 PST 2012
34:39