feat: allow specifying concurrency in config / environment #10236
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chris-olszewski
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If you could rebase, I'll work on getting this merged and released in the next canary. Thank you for the contribution! |
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Should be good to go! |
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Description
This adds a couple new ways to configure task run concurrency:
TURBO_CONCURRENCYenvironment variableconcurrencyconfiguration value inturbo.jsonThese options should follow the same precedence rules for other options which are made available in multiple locations. I think the environment variable is the most valuable to me (IMO), as this would make it a lot easier to turn off or drastically reduce concurrency in CI scenarios with restricted performance, where running multiple test suites at the same time could cause flaky results due to timeouts, or too much resource contention in general scenarios. Being able to specify this in the configuration file is maybe less valuable, but there are situations where it might be desirable.
The
--concurrencyoption is obviously already available and certainly usable in combination with other changes (enforcing the use of an alias, or setting up differentpackage.jsonscripts for CI and local development), but enabling this to be enforced via the config or an environment variable makes it a lot easier to turn off concurrency in CI, for example.There is some active desire for this feature to exist:
Notably, this does not enable configuring concurrency per task, which was part of one of the discussions here. That seemed like a much larger lift vs. just adding an environment variable and config option that behaved exactly like the CLI argument already does. There is still some demand for this "simple" option.
Testing Instructions
turboturbo.json, with the same behaviour as the CLI argument.TURBO_CONCURRENCYenvironment variable, with the same behaviour as the CLI argument.I've done this checks (with some print debugging) on repos where I use
turboand it seems to work as expected. I've added some unit and integration tests where it seemed to make the most sense, but there were some spots where it was unclear if I should add something. If I've missed a spot or need some additional checks, let me know!