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THE FEUTEX TOOLKIT

Checkpoint Interval First Order Model

Balance checkpoint overhead against expected rework using a first-order failure model.

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FormulaApproximate compute interval = Math.sqrt(2*cost*mtbf*3600); First-order checkpoint and rework fraction = 100*Math.sqrt(2*cost/(mtbf*3600))
Sources and model references

Made for real tasks

  • Balance checkpoint overhead against expected rework using a first-order failure model.
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Worked example

Inputs

Checkpoint duration
30 s
Mean time between job failures
24 hours

Expected results

Approximate compute interval
2276.839915 s
First-order checkpoint and rework fraction
2.635231383 %

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter checkpoint duration, mean time between job failures in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "cost": 30,
  "mtbf": 24
}

Accuracy and scope

Young first-order approximation with independent exponential failures and checkpoint cost small relative to mean failure interval; excludes restart time and failures during checkpointing.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.