I just accepted yt-doc PR #7,
which solves some of the parallel documentation, but not all of it, as is my understanding. Sam, you were going to document multilevel parallelism before we close issue #330 (https://bitbucket.org/yt_analysis/yt/issue/330/multilevel-parallelism), right?
However, does this completely close issue #247 (https://bitbucket.org/yt_analysis/yt/issue/247/estimates-of-resources-for-pa... If so, I'll close that ticket forthwith.