VCS tests: Make smaller Arbitrary repositories to speed up long-tests 4.2x
#10588
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Arbitrary repositoriesArbitrary repositories to speed up long-tests 4.2x
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geekosaur
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The `Arbitrary` repo recipes can get quite large due to nesting: - `RepoRecipes` contain a number of groups (`TaggedCommits` or `BranchCommits`). - Groups contain a number of `Commit`s. - Commits contain a number of operations (`FileUpdate` or `SubmoduleAdd`). There's also another wrinkle in that `SubmoduleAdd`s contain a `Commit` themselves, so square the `operationsPerCommit` number! Then, a rough upper bound of the number of `git` calls required for an arbitrary `RepoRecipe` is `groupsPerRecipe * commitsPerGroup * operationsPerCommit^2`. The original implementation of these instances, which chose reasonable-sounding size parameters of 5-15, led to a maximum of 1875 operations per test case! No wonder they took so long! In my tests, this change reduces the time of running the `long-tests` suite from 429 seconds to 102 seconds (a 4.2x speedup).
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The
Arbitraryrepo recipes can get quite large due to nesting:RepoRecipescontain a number of groups (TaggedCommitsorBranchCommits).Commits.FileUpdateorSubmoduleAdd).There's also another wrinkle in that
SubmoduleAdds contain aCommitthemselves, so square theoperationsPerCommitnumber!Then, a rough upper bound of the number of
gitcalls required for an arbitraryRepoRecipeisgroupsPerRecipe * commitsPerGroup * operationsPerCommit^2.The original implementation of these instances, which chose reasonable-sounding size parameters of 5-15, led to a maximum of 1875 operations per test case! No wonder they took so long!
In my tests, this change reduces the time of running the
long-testssuite from 429 seconds to 102 seconds (a 4.2x speedup).