Optimize Workflow Performance and Cost GH-200 Practice Questions (Page 5)

Questions 21–24

1. 21application · medium

   A workflow has a job that runs a long integration test suite. The team wants to reduce the overall workflow time by running the tests in parallel across multiple machines. Which feature should they use?

   • AA concurrency group that limits parallel runs.
   • BA single job with multiple steps.
   • CA larger runner with more CPU cores.
   • DA matrix strategy that defines multiple test shards.
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2. 22foundation · easy

   What is the purpose of the 'concurrency' key in a GitHub Actions workflow?

   • ATo limit the number of concurrent runs of a workflow or job
   • BTo define the operating system for a job
   • CTo run multiple jobs in parallel
   • DTo cache dependencies between jobs
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4. 23expert · hard

   A workflow builds a Docker image and pushes it to a registry. The build step uses `docker build` which takes 6 minutes because it downloads base images and installs packages. The team wants to reduce the build time and cost. They also want to ensure that the cache is invalidated when the Dockerfile changes. Which approach should they use?

   • AIncrease the timeout-minutes for the build job.
   • BUse Docker layer caching with a key based on the hash of the Dockerfile.
   • CUse a larger runner with more memory.
   • DUse concurrency control to cancel in-progress runs.
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5. 24application · medium

   A workflow runs three independent test suites (unit, integration, and end-to-end) sequentially, taking 30 minutes total. The team wants to reduce the total time to completion. Which strategy should they use?

   • AUse concurrency control to prevent multiple runs from overlapping.
   • BCombine all three test suites into a single job to reduce overhead.
   • CIncrease the timeout-minutes for the job.
   • DConvert the three test suites into a matrix job that runs them in parallel.
   Reveal Solution Discussion Select an answer first