Include CPU times in profiling
Summary:
Our automated performance profiling thus far has been using wall
times. Wall times are somewhat sensitive to environmental factors, though. The
hope is that CPU times will be more reliable.
This is a little tricky, since each worker needs to record its own CPU times
and send them back to the master process. Luckily, we already have the
`Measure` library which does this :)
Reviewed By: samwgoldman
Differential Revision:
D4282968
fbshipit-source-id:
c8a989c0b97d501d48d032852d40a5c91da4d9bd