MarcoFalke afffbb1bc6
Merge #19710: bench: Prevent thread oversubscription and decreases the variance of result values
3edc4e34fe2f92e7066c1455f5e42af2fdb43b99 bench: Prevent thread oversubscription (Hennadii Stepanov)
ce3e6a7cb21d1aa455513970846e1f70c01472a4 bench: Allow skip benchmark (Hennadii Stepanov)

Pull request description:

  Split out from #18710.

  Some results (borrowed from #18710):
  ![89121718-a3329800-d4c1-11ea-8bd1-66da20619696](https://user-images.githubusercontent.com/32963518/90146614-ecb89800-dd89-11ea-80fe-bac0e46e735e.png)

ACKs for top commit:
  fjahr:
    Code review ACK 3edc4e34fe2f92e7066c1455f5e42af2fdb43b99

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