Running tests in parallel slower compared to running individual tests.

[JiaZhenLin]

For ex,I have 2000 tests,And my computer has 8 core,and run 8 tests in parallel.then each test maybe take 2s,if i run individual,it maybe take 1s for each test.If me sometings wronging?How can I speed up the tests in parallel?

[bradwilson]

It would be helpful if you could provide some examples of the kinds of test that are slow, maybe even a repro project.

[TylerBrinkley]

It might be related but we just upgraded to xunit 2.8.0 from 2.7.0 and our the test duration nearly doubled and we use a lot of parallelization.

[bradwilson]

@TylerBrinkley Have you tried reverting back to the pre-2.8 parallelization algorithm?

The release notes mentioned the new algorithm:

For more information, see the docs page: https://xunit.net/docs/running-tests-in-parallel#algorithms

[TylerBrinkley]

Thanks @bradwilson. I changed the parallelAlgorithm from the new default of conservative to aggressive and the tests are running as quick as they were before. Thanks!

[bradwilson]

@JiaZhenLin Does my answer to Tyler help you resolve your issue?