How would you troubleshoot slow Jenkins build times

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How would you troubleshoot slow Jenkins build times?
Optimizing Jenkins build times is essential for improving CI/CD efficiency. This question examines approaches for diagnosing and speeding up slow builds, including pipeline stage optimization, caching dependencies, resource allocation, and reducing redundant steps. Tips or examples could demonstrate adjustments in a sample Jenkinsfile or effective use of parallel processing.
Nov 14 in DevOps Tools by Anila
• 4,440 points
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1 answer to this question.

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When Jenkins builds take too long, start by identifying the time taken by each stage.
Analyze the logs to pinpoint bottlenecks and split lengthy tasks into parallel stages where feasible.

Optimization Steps:

  1. Dependency Caching: Cache dependencies (e.g., node_modules for Node.js or .m2 for Maven) to reduce download times.

  2. Parallelization: Run tests, builds, and deployments in parallel stages if dependencies allow.

  3. Containerized Builds: Use containerized builds to ensure isolation and consistency, minimizing conflicts that can slow down builds.

  4. Hardware/Resource Scaling: If performance issues persist, allocate more memory and CPU resources or utilize dedicated build agents.

This example shows parallel test execution to reduce build time.

answered Nov 25 by Gagana
• 5,810 points

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