PlaceholderExecutable currently occupies an actual Executor thread by just sleeping, which is wasteful since there is a cost to holding a running thread. Would be better if Queue.Executable had an optional mode which would be friendly to asynchronous jobs.

          [JENKINS-26098] Asynch Queue.Executable

          Jesse Glick created issue -
          Jesse Glick made changes -
          Link New: This issue duplicates JENKINS-25938 [ JENKINS-25938 ]
          Jesse Glick made changes -
          Resolution New: Duplicate [ 3 ]
          Status Original: Open [ 1 ] New: Resolved [ 5 ]
          R. Tyler Croy made changes -
          Workflow Original: JNJira [ 160088 ] New: JNJira + In-Review [ 196311 ]
          Andrew Bayer made changes -
          Labels Original: api performance threads workflow New: api performance pipeline threads workflow
          Andrew Bayer made changes -
          Labels Original: api performance pipeline threads workflow New: api performance pipeline threads

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            jglick Jesse Glick
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