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Your Timer Is a Wall Clock, Not a Stopwatch: Four Elapsed-Time Myths and a Monotonic Probe

How long did that batch job take? Simple question. Your logs probably answer it wrong. I kept seeing two numbers for one run. The job log said eleven minutes. The dashboard said forty-two.

  • Wall clock measures what time it is, not how long a task took
  • Monotonic clock never goes backward, suitable for measuring durations
  • Timeouts indicate local socket issue, not remote task completion

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