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  1. Core Server
  2. SERVER-30120

InMemory engine: 'inMemorySizeGB' doesn't limit the process memory usage

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    • Type: Icon: Bug Bug
    • Resolution: Works as Designed
    • Priority: Icon: Critical - P2 Critical - P2
    • None
    • Affects Version/s: 3.2.15
    • Component/s: Internal Code, Performance, Stability
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      Start in memory mongod process using:
      /usr/bin/mongod --storageEngine inMemory --inMemorySizeGB 2 --quiet --config /etc/mongod.conf

      Create enough DBs to make the process memory higher than 2GB.

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      Start in memory mongod process using: /usr/bin/mongod --storageEngine inMemory --inMemorySizeGB 2 --quiet --config /etc/mongod.conf Create enough DBs to make the process memory higher than 2GB.

      Using MongoDB Enterprise v3.2.15 on Ubuntu 16.04
      Starting mongod as a service using:
      /usr/bin/mongod --storageEngine inMemory --inMemorySizeGB 2 --quiet --config /etc/mongod.conf

      It seems that the memory limit doesn't really limit the process memory, mongod process could take more than 3GB of memory.

      Note that on our implementation we work with few hundreds of DBs.
      Specifically our auto tests creates a large amount of databases and drop them after the test ends. However the memory isn't released.

      Also after a while the process start to take ~100% CPU even without any client load.

      Thanks,
      Assaf

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            Assignee:
            mark.agarunov Mark Agarunov
            Reporter:
            assaf@xmcyber.com Assaf Oren
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              Created:
              Updated:
              Resolved: