median / min / max million messages per second, 5 runs each
P=1 C=1 cap=16
  C lock ring             1.163    0.728    1.501  n=5
  C seq ring             12.061    2.601   15.757  n=5
  C ht ring               5.003    2.815    5.160  n=5
  C handoff chan          0.540    0.526    0.592  n=5
  C retry chan            0.504    0.451    0.608  n=5
  Go chan                 8.373    7.021    8.679  n=5
  crossbeam bounded       1.288    0.841    1.927  n=5
  std sync_channel        0.411    0.380    0.434  n=5
P=1 C=1 cap=1024
  C lock ring            11.613    5.209   13.687  n=5
  C seq ring             24.173   16.085   49.506  n=5
  C ht ring              15.783    5.769   40.219  n=5
  C handoff chan          7.530    5.161   25.837  n=5
  C retry chan           21.787    7.083   38.143  n=5
  Go chan                10.234    7.025   13.185  n=5
  crossbeam bounded      12.225    8.713   20.261  n=5
  std sync_channel        7.570    5.665   23.909  n=5
P=2 C=2 cap=16
  C lock ring             1.820    1.397    2.250  n=5
  C seq ring             10.909    6.568   31.990  n=5
  C ht ring               2.498    1.747    6.647  n=5
  C handoff chan          1.219    1.139    1.387  n=5
  C retry chan            1.139    1.083    1.290  n=5
  Go chan                 9.868    8.140   11.854  n=5
  crossbeam bounded       3.074    1.884    4.608  n=5
P=2 C=2 cap=1024
  C lock ring            22.723    8.697   26.003  n=5
  C seq ring             45.615   24.163   47.290  n=5
  C ht ring               5.479    2.584   15.441  n=5
  C handoff chan         13.692    4.539   24.723  n=5
  C retry chan           35.308   30.228   39.125  n=5
  Go chan                16.375   11.993   16.842  n=5
  crossbeam bounded      16.127   13.204   18.127  n=5