Workflows
Matrix explosion
Quick answer
Matrix explosion is the combinatorial growth in job count that occurs when several matrix dimensions multiply together.
Matrix explosion is the combinatorial growth in job count that occurs when several matrix dimensions multiply together.
Why it matters
Four OSes by five language versions by two architectures is forty jobs from a fifteen-line definition. Use include and exclude to test the combinations that actually matter.
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Related
Artifact retentionArtifact retention is the period GitHub keeps workflow artifacts before deleting them, defaulting to 90 days and configurable per repository or per upload.Build matrixA build matrix is a GitHub Actions feature that expands one job definition into many parallel jobs across combinations of variables such as OS and language version.Composite actionA composite action bundles several workflow steps into a single reusable action defined in YAML, without needing JavaScript or a container.Concurrency groupA concurrency group is a named lock that limits how many workflow runs matching that name can be in progress at once.