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THE FEUTEX TOOLKIT

CI Test Shard Runtime

Compare equal-work test sharding against per-shard setup overhead.

Computer Systems workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaIdeal wall time = work/n+setup; Total runner time = work+n*setup

Made for real tasks

  • Compare equal-work test sharding against per-shard setup overhead.
Explore step-by-step workflows →

Worked example

Inputs

Total test execution time
120 min
Parallel shards
8 shards
Setup per shard
3 min

Expected results

Ideal wall time
18 min
Total runner time
144 min

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 total test execution time, parallel shards, setup per shard in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "work": 120,
  "n": 8,
  "setup": 3
}

Accuracy and scope

Perfectly balanced independent tests with all runners available; no serial phase.

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.