BuildPhysicsWorld idle step takes ages | Official Unity Discord | Page 1

little quiver Jul 8, 2024, 11:38 AM

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I've got 2 entities on my stage that has physicsbody and physicsShape components on them - both a simple capsule. When they're both on the stage, I get major performance issues and it appears to be coming from the idle step of the BuildPhysicsWorld system.

Attached is the the profiler for it. That idle step takes up 95% of the time in a frame, and pushes the step to take over 3000ms

When I start the game, I can only get maybe 2 or 3 seconds into the game before it all becomes too slow to continue.

Anyone got any ideas on where I can start looking?

frank agate Jul 8, 2024, 12:08 PM

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Look at the timeline view to see what the actual issue is

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it's completing a job

little quiver Jul 9, 2024, 6:09 AM

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Here is the timeline view - where should I be looking? it doesn't seem to reveal anything more from what i can see:

frank agate Jul 9, 2024, 6:14 AM

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look at your job thread

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you have a very slow, unbursted job

urban sentinel Jul 9, 2024, 6:55 AM

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what's this?

little quiver Jul 9, 2024, 9:20 AM

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ah indeed it was a job that ran within the FixedStepSimulationSystemGroup. Thanks for pointing me in the right direction you guys.

little quiver Jul 9, 2024, 9:21 AM

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frank agate you have a very slow, unbursted job

how did you know it was unbursted at a glance? indeed it was unbursted as when I wrote the job I needed to log things to the console to debug, but forgot to re-enable burst on it

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Is there any ECS directed videos you guys would recommend on how to read/get more out of the unity profiler?

frank agate Jul 9, 2024, 10:34 AM

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little quiver how did you know it was unbursted at a glance? indeed it was unbursted as when I...

It's in blue

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Bursted code appears green

#BuildPhysicsWorld idle step takes ages