Attempt to fix benchmarking on Phoenix

[sbryngelson]

Attempting to fix benchmarking on Phoenix by fixing the OpenMPI tmp directory as a locally accessible, existing directory.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.24%. Comparing base (3c80270) to head (545fbe0).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #849   +/-   ##
=======================================
  Coverage   43.24%   43.24%           
=======================================
  Files          68       68           
  Lines       20183    20183           
  Branches     2402     2402           
=======================================
  Hits         8728     8728           
  Misses       9986     9986           
  Partials     1469     1469           

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