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Speed up tests locally by upto 45% #1818

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Sep 24, 2023
Merged

Speed up tests locally by upto 45% #1818

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Update package.json
anshgoyalevil Sep 24, 2023
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Merge branch 'main' into boost-tests-locally
anshgoyalevil Sep 24, 2023
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2 changes: 1 addition & 1 deletion packages/jaeger-ui/package.json
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Expand Up @@ -104,7 +104,7 @@
"coverage": "yarn run test-ci --coverage",
"start:ga-debug": "REACT_APP_GA_DEBUG=1 REACT_APP_VSN_STATE=$(../../scripts/get-tracking-version.js) vite",
"start": "vite",
"test": "jest",
"test": "jest --maxWorkers=50%",
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does % refer to the number of available CPU cores?

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Yes. It's the CPU Cores present in the current run environment. Most of the articles on internet recommends this setting.

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@yurishkuro yurishkuro Sep 24, 2023 •
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Makes sense for local testing, so as not to bring the whole system down during the test. But if this %-based addressing scheme is available, why does the line below have --maxWorkers=4? We don't really know how many CPU cores are available in a CI runner, but it would make sense to utilize all of them.

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Every CI environment has their own workers limit, and the setting which we are currently using for test-ci is adapted to GitHub Actions only.

Moreover, reason for choosing a concrete value (4) instead of % over here is because in CI, we know we won't be performing multi-tasking, so all threads can be used for tests. (Minus the thread for main workflow task)

In future, if we have any plans to move to another CI environment like CircleCI, I think we would again have to figure out this max number of workers. (I guess, it's 8 for CircleCI).

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But why can't we say 100% for GitHub? When the tests are running, no other activity is higher priority.

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Theoretically that seems right. Don't know why everyone suggests using a number value instead of percentage in CI for jest.

I would have to try that thing.

"test-ci": "CI=1 jest --silent --color --maxWorkers=4"
},
"jest": {
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