add multicpu test

[fancaiyu]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.66%. Comparing base (2596397) to head (072901e).
Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   88.90%   90.66%   +1.75%     
==========================================
  Files           9       10       +1     
  Lines        1181     1210      +29     
==========================================
+ Hits         1050     1097      +47     
+ Misses        131      113      -18     

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