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Author:
{u'username': u'dannenberg', u'name': u'matt dannenberg', u'email': u'matt.dannenberg@10gen.com'}
Message: SERVER-15344 Make replWriter thread pool size tunable
Branch: master
https://github.com/mongodb/mongo/commit/2482017dad01990b9ab4597dcef3c43940564180
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Since the prefetcher threads are only used for mmapV1, this work will only make the replWriter thread pool size tunable.
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This experiment demonstrates continued scaling by increasing worker threads beyond 16.
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I think it would be good to have a default based on the number of CPUs, but it should probably still be tunable.
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Is it feasible to make this self-tuning rather than manual (eg num_cpus if scaling with machine size)?
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Tuning this may be necessary to avoid replication lag for some deployments. See this comment for more detail.
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