[sgen] Switch to nopar context when we are left with one worker
authorVlad Brezae <brezaevlad@gmail.com>
Wed, 28 Sep 2016 23:16:06 +0000 (02:16 +0300)
committerVlad Brezae <brezaevlad@gmail.com>
Thu, 19 Jan 2017 22:45:15 +0000 (00:45 +0200)
Non-parallel context is significantly faster since it doesn't require CAS-ing. Use it when we are left with only one worker so we don't regress performance.


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