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Try to leave 1GB RAM free of Unicorn workers

username-removed-5302 requested to merge jacobvosmaer/omnibus-gitlab:unicorn-worker-memory-limit into master

If we keep adding Unicorn workers as CPU cores go up we can run out of memory. After this change:

  • the minimum number of Unicorn worker processes is 2
  • if there is enough RAM, we get ncores+1 worker processes
  • assuming 250MB/Unicorn, leave 1GB RAM free for other services. (1.5GB RAM: max 2 Unicorns, 2GB: max 4 Unicorns, 4GB: max 12 Unicorns, etc.)

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