Details
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Type:
New Feature
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Status: Closed
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Priority:
Major - P3
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Resolution: Fixed
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Affects Version/s: None
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Component/s: Internal Code
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Labels:
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Backwards Compatibility:Fully Compatible
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Backport Requested:v4.2, v4.0, v3.6
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Sprint:Performance 2019-12-02, Performance 2019-12-16
Description
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
Example:
db.adminCommand({setParameter: 1, tcmallocReleaseRate: 10})
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Attachments
Issue Links
- depends on
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SERVER-46898 The tcmallocReleaseRate parameter does not work in 4.0 and 3.6
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- Closed
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- is documented by
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DOCS-13271 Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter
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- Closed
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- related to
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SERVER-16829 Expose tcmalloc runtime configuration options through setParameter mechanism
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- Closed
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