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# performances
Slackbot
07/13/2023, 10:53 AMThis message was deleted.
a
Adam
07/13/2023, 10:59 AMI thought that parallel tasks in a single subproject required configuration cache to be enabled
g
Gabriel Ittner
07/13/2023, 10:59 AMEither configuration cache enabled or the tasks need to use the worker API
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t
twisterrob
07/13/2023, 10:59 AMparallel tasks existed way before CC, just
org.gradle.parallela
Alex Semin
07/13/2023, 10:59 AMI think so as well. The
--parallelAlex Semin
07/13/2023, 11:00 AMt
twisterrob
07/13/2023, 11:00 AMbut then how does it run compileKotlin and spotlessKotlin in parallel?
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Adam
07/13/2023, 11:04 AMI would guess thatās because KotlinCompile uses the Worker API - but Iām not certain
ā 2
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twisterrob
07/13/2023, 11:04 AMwow, I think this confirms what you're saying:
Copy code
tasks.register("task1") {
doFirst { Thread.sleep(1000) }
}
tasks.register("task2") {
doFirst { Thread.sleep(1000) }
}twisterrob
07/13/2023, 11:05 AMwith or without
--parallela
Adam
07/13/2023, 11:05 AMitās a bit funny sometimes actually, if a task uses the Worker API then itās not possible for that same task to āwaitā until the worker tasks have completed and do some additional work
e
ephemient
07/13/2023, 11:05 AMproject isn't safe for use in parallel
ephemient
07/13/2023, 11:06 AMworker API and configuration cache both prevent project access during execution so they can be parallel
ephemient
07/13/2023, 11:06 AMotherwise gradle runs tasks serially within a single project
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Adam
07/13/2023, 11:07 AMI think it would be worth making a feature request for Gradle Scan actually @twisterrob. Something like ātasks that use the Worker API should be highlighted in the timelineā, or āthe timeline should show task execution time and worker execution times separatelyā
t
twisterrob
07/13/2023, 11:08 AMso in the small test above, if I run
gradle task1 task2 --scan --parallel --configuration-cachetwisterrob
07/13/2023, 11:09 AM@Adam would you mind doing that? I'm not sure I understand it enough to explain it.
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Adam
07/13/2023, 11:10 AMI donāt use Gradle Scan so it doesnāt bother me :). I wanted to make that suggestion to validate that what you saw was indeed confusing, and probably confuses most people, and could be improved
t
twisterrob
07/13/2023, 11:12 AMYou guys just blew my mind, I guess I had it good with 20+ module projects and didn't notice this š.
twisterrob
07/13/2023, 11:12 AMIs there anything I can do to make these tests run in parallel? Do I need to introduce multiple projects to run them? (which is not even possible, because the matrix test tasks are created dynamically based on a file/network call)
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Alex Semin
07/13/2023, 11:14 AMThey should run in parallel, if you enable configuration cache. Can you share a build scan link where you run those (but without the
--parallelt
twisterrob
07/13/2023, 11:15 AMok, so that's weird then,
--paralleltwisterrob
07/13/2023, 11:17 AM(or maybe not, it's possible
--paralleltwisterrob
07/13/2023, 11:22 AMok, so, caching is not the problem per se. In Gradle 7.6 the first execution (when CC is not reused yet)
gradle task1 task2 --scan --configuration-cache --paralleltwisterrob
07/13/2023, 11:22 AMthank you, I'll try enabling CC for this project then š¤
twisterrob
07/13/2023, 11:25 AMooooh yeah, ripping my PC in pieces now!
š 3
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twisterrob
07/13/2023, 11:26 AMš