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Type:
Task
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Labels:None
Description
Should be added to https://docs.mongodb.com/manual/reference/parameters/
Text from https://gperftools.github.io/gperftools/tcmalloc.html#runtime: "Rate at which tcmalloc releases unused memory to the system. Zero means it never release memory back to the system. Increase this flag to return memory faster; decrease it to return memory slower. Reasonable rates are in the range [0.0,10.0]. "
(Default is 1)
Description of Linked Ticket
SERVER-16829 exposed tcmalloc_aggressive_decommit via the setParameter framework. This has turned out to be not very useful, as aggressive decommit comes with a huge performance penalty. (-75% in a small YCSB workload.)
We recently found that tcmalloc_release_rate can be used to reduce memory overhead, with little or no performance overhead. We should add a setParameter knob to do this at runtime too.
Relevant tcmalloc documentation
Scope of changes
Impact to Other Docs
MVP (Work and Date)
Resources (Scope or Design Docs, Invision, etc.)
- documents
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SERVER-42697 Expose tcmalloc_release_rate via setParameter
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- Closed
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