Mixxx with 4 decks unusable on 2017 retina macbook pro

[RJ Skerry-Ryan]

Mixxx is unusable on a 15" retina Macbook Pro 2017 with Core i7 2.8 gHz processor with 4 decks playing.

2 decks work reasonably well, thanks to the improvements in
https://github.com/mixxxdj/mixxx/pull/1897
but 4 decks pushes Mixxx into some kind of livelock state, where rendering the GUI cannot keep up with the engine.

[RJ Skerry-Ryan (rryan)]

By unusable, I mean there are multiple seconds of GUI lag for any action (clicking play, scratching a waveform, etc.).

[RJ Skerry-Ryan (rryan)]

Lots of hypotheses about potential root causes for this, I'll add some more comments and a video to better demonstrate the symptoms.

[Be (be.ing)]

Can you reproduce this with --safeMode? Which macOS SDK do you build with?

[RJ Skerry-Ryan (rryan)]

10.13 SDK on macOS 10.13.6 built via Homebrew, not using the official build environments. But the 2.2.0 release binary has this problem too.

Can't reproduce with --safeMode, though FPS 60 does cause some lag (100-200ms) when seeking with WOverview even with --safeMode, since the VU meters are being rendered at 60 FPS by the VsyncThread.

[jus (jus)]

Same on macOS 10.14.2 (18C54) with latest master
Macbook pro 2018 with automatic graphics switching
Qt 5.12.0 via homebrew
OpenGL: 4.1

*3 fps when idle
*8 fps when idle with spinnies, and preview button disabled
*12 fps when idle with ``--safemode``

waveformUpdateTick() emitted several hundred times per second??

Worth noticing that, when starting wit ``safemode`` , the integrated graphics is used , while when starting normal, discrete graphics is used

[Be (be.ing)]

Is this from side effect from moving to Qt 5? Was performance better with 2.1?

[Foss-4 (foss-4)]

Retested and unable to reproduce.

mixxx-2.3.0-alpha-pre-master-git6770
macOS 10.14.4
MacBook Pro 2011

4 Decks Playing simultaneously: works fine. no retina on that oldtimer mac.

@rryan @jus is this still persisting for you?

[Foss-4 (foss-4)]

no edit option in launchbad?
macOS is 10.13.6 not 10.14.4

[Foss-4 (foss-4)]

@jus do you have a retina mac to try and reproduce this? could you test if this problem persists in current master?

[Foss-4 (foss-4)]

retested:
macbook pro 2017
macOS 10.14.5
mixxx 2.3.0-alpha-pre (build master r6796)

4 decks playing, no problem

worksforme woulde be the correct state, does not exist so setting to fix commited, although unsure which exact commit fixed this.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/9559