SwiftUI app outputting CVDisplayLink related messages to console?

UI Frameworks SwiftUI
peggers123 OP
Created Dec ’21
Replies 11
Boosts 0
Views 3.5k
Participants 12

I'm getting a lot of output on the console as I run a MacOS based SwiftUI app I'm developing, for example:

2021-12-08 12:40:14.439565+0000 SpDriveApp[6801:159299] [] [0x7fe6e7830820] CVCGDisplayLink::setCurrentDisplay: 1892262333
2021-12-08 12:40:14.439785+0000 SpDriveApp[6801:159299] [] [0x7fe6e7830800] CVDisplayLinkCreateWithCGDisplays count: 1 [displayID[0]: 0x70c9a1bd] [CVCGDisplayLink: 0x7fe6e7830820]
2021-12-08 12:40:14.439827+0000 SpDriveApp[6801:159299] [] [0x7fe6e7830800] CVDisplayLinkStart
2021-12-08 12:40:14.439853+0000 SpDriveApp[6801:159299] [] [0x7fe6e7830820] CVDisplayLink::start
2021-12-08 12:40:14.439993+0000 SpDriveApp[6801:182706] [] [0x60000f698460] CVXTime::reset

Has anyone else seen this? Have I accidentally switched on a diagnostic tool, or is there something else I am doing wrong?

Answered by jalkut in 707663022

I was frustrated by this today and decided to dig into it. tldr: pass "-cv_note 0" to quiet just these messages and not all system logs. You can read more about my analysis here: https://indiestack.com/2022/03/quieting-cvdisplaylink-logging/

Replies  11
Boosts  0
Views  3.5k
Participants  12
jordi OP
Dec ’21

I started getting this yesterday as well!

0
MasamiSS OP
Dec ’21

Me too, xcode 13.2 rc1 and macOS 12.1.

0
mallman OP
Dec ’21

I've started seeing these messages after upgrading to Monterey 12.1. Ugh.

0
mallman OP
Dec ’21

As a rather blunt "workaround", you can hide all of these system logging messages by setting OS_ACTIVITY_MODE=disable as an environment variable in the Scheme you use to run your app. Of course, this will disable all system log messages, including ones that are actually helpful. But I don't know of a more precise way to just turn off messages from specific subsystems. That would be nice.

3
Maiq OP
Dec ’21

Same here. I'm currently working on a Metal app, and I'm seeing all these messages after upgrading to Monterey 12.1 and Xcode 13.2

0
myurik2 OP
Dec ’21

Same for macOs App built on SwiftUI. Started to happen after update to macOS 12.1 and Xcode 13.2

0
MarkErbaugh OP
Dec ’21

Me too, on an existing project, but not a brand new project (just the simple "Hello, World" starter app).

0
mathieuj OP
Dec ’21

This won't help anyone, but... Same here. + a busload of [default] invalid display identifier... Very annoying.

0
jordi OP
Dec ’21

Filed a FB report if anyone wants to dupe : FB9822873

0
jalkut OP
Mar ’22
Accepted Answer

I was frustrated by this today and decided to dig into it. tldr: pass "-cv_note 0" to quiet just these messages and not all system logs. You can read more about my analysis here: https://indiestack.com/2022/03/quieting-cvdisplaylink-logging/

3
Cloudworker OP
Mar ’22

Hi

Did you solve this?

I have the same problem with a Circle().animation(.linear). If I remove the animation, it works as expected.

0
SwiftUI app outputting CVDisplayLink related messages to console?
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