[Bug]: Jest in a container over-estimates available resources

[robert-smith-maersk]

Version

29.7.0

Steps to reproduce

Run Jest in a container.

Expected behavior

Jest will establish available resources in the container and configure itself appropriately e.g.

    "maxConcurrency": 5,
    "maxWorkers": 1,

Actual behavior

Jest appears to allocate resource based on the host machine specs e.g.

"maxConcurrency": 5,
    "maxWorkers": 31,

Which results in the container being OoM killed.

Additional context

No response

Environment

The container spec is:

        resources:
          requests:
            memory: "8Gi"
            cpu: "2"
            ephemeral-storage: "20Gi"
          limits:
            memory: "8Gi"
            cpu: "2"
            ephemeral-storage: "20Gi"


However envinfo reports:


  System:
    OS: Linux 5.15 Ubuntu 22.04.5 LTS 22.04.5 LTS (Jammy Jellyfish)
    CPU: (32) x64 AMD EPYC 7763 64-Core Processor
  Binaries:
    Node: 20.19.1 - ~/_work/_tool/node/20.19.1/x64/bin/node
    npm: 10.8.2 - ~/_work/_tool/node/20.19.1/x64/bin/npm
  npmPackages:
    jest: ^29.7.0 => 29.7.0

[lencioni]

My understanding is that Node's os.availableParallelism is supposed to solve this, which is what Jest uses as of v29.4.0 (https://github.com/jestjs/jest/pull/13738). But maybe there's something else going on?

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