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  1. Core Server
  2. SERVER-42697

Expose tcmalloc_release_rate via setParameter

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    Details

    • Backwards Compatibility:
      Fully Compatible
    • Backport Requested:
      v4.2, v4.0, v3.6
    • Epic Link:
    • 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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          Task - A task that needs to be done. DOCS-13271 Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter

          • Major - P3 - Major loss of function.
          • Open
          related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-16829 Expose tcmalloc runtime configuration options through setParameter mechanism

          • Major - P3 - Major loss of function.
          • Closed

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                • Created:
                  Updated:
                  Resolved: