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THE FEUTEX TOOLKIT

Block Device Interval Metrics

Derive throughput, average request size and queue occupancy from interval counters.

Computer Systems workspace● Runs in your browser
01 Your input
02 Your result
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FormulaIOPS=ΔIO/time; bandwidth=512Δsectors/time; queue=weightedTime/time
Sources and model references

Worked example

Inputs

Completed I/O delta
1000
512-byte sector delta
8000
Weighted I/O time delta
2000 ms
Observation interval
10 s

Expected results

IOPS
100 IOPS
Transferred bytes per second
409600 bytes/s
Mean completed request size
4096 bytes
Average outstanding I/O
0.2 requests

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 the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "ios": 1000,
  "sectors": 8000,
  "weighted": 2000,
  "elapsed": 10
}

Accuracy and scope

Counter deltas must cover the same device and interval; mean size is zero when no completions. Simplified analytical model; not a design recommendation or safety certification.

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.