Commits on Nov 21, 2022

1. Change to more efficient worker termination …

   * Before: Mutant would terminate all worker processes in sequence, while
     waiting for each pid to terminate separtae.
     This creates way more context switches than needed and resulted in a
     serial bottleneck.
   * Now mutant signals all worker processes than collects the statuses in
     a secondary loop.
   * Reducing this serial dependency improves mutant exit performance by
     several seconds on a high core cound machine, and is also measurable
     on more regular machines.

   

   mbj committed Nov 21, 2022
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