test-memory-usage failing on Windows

[aduh95]

Test

test-memory-usage

Platform

Windows x64

Console output

failed 10 out of 10
not ok 678 parallel/test-memory-usage
  ---
  duration_ms: 223.00000
  severity: fail
  exitcode: 1
  stack: |-
    node:internal/assert/utils:146
      throw error;
      ^
    
    AssertionError [ERR_ASSERTION]: 10506495 - 20737 === 10485760
    + actual - expected
    
    + 10485758
    - 10485760
            ^
    
        at Object.<anonymous> (d:\workspace\node-test-binary-windows-js-suites\node\test\parallel\test-memory-usage.js:47:10)
        at Module._compile (node:internal/modules/cjs/loader:1873:14)
        at Module._extensions..js (node:internal/modules/cjs/loader:2013:10)
        at Module.load (node:internal/modules/cjs/loader:1596:32)
        at Module._load (node:internal/modules/cjs/loader:1398:12)
        at wrapModuleLoad (node:internal/modules/cjs/loader:255:19)
        at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
        at node:internal/main/run_main_module:33:47 {
      generatedMessage: false,
      code: 'ERR_ASSERTION',
      actual: 10485758,
      expected: 10485760,
      operator: 'strictEqual',
      diff: 'simple'
    }
    
    Node.js v27.0.0-pre
  ...

Build links

• https://github.com/nodejs/reliability/blob/main/reports/2026-05-08.md
• https://github.com/nodejs/reliability/blob/main/reports/2026-05-09.md

Additional information

Not sure if flaky is the right term since it seems to fail 100% of the times

[inoway46]

I opened #63214.

The failure is off by 2 bytes (10485758 vs 10485760), which suggests the 10 MiB ArrayBuffer allocation is being tracked, but some unrelated ArrayBuffer/Buffer memory may be getting freed between the two process.memoryUsage() snapshots.

The PR keeps the strict arrayBuffers delta check and calls gc() before taking the baseline to reduce that chance.

If that is not enough to make the exact delta stable, another option would be to relax the assertion to allow small unrelated ArrayBuffer cleanup between the snapshots.