Memory Leak on Boids Example on Intel Mac

[Aultus-defora]

Description
Starting from MacOS Ventura, my Fusion Drive MacOS machine using wgpu and apps using it accumulate memory over time.

Repro steps
Turn on a MacOS machine that uses Fusion Drive. With wgpu v23 branch cargo run --bin wgpu-examples boids --release

Expected vs observed behavior
I hoped bugfix in ddff69b would prevent this issue from still happening. It seems to be the same as #5394 was, except it got fixed for many other settups in that commit.

Extra materials
1 Minutes of running the boids example on release:

after running it for roughly 5 minutes:

10 minutes:

Platform
iMac with Fusion Drive 1T, MacOS Sequoia 15.2, 8 GB of memory
CPU: 3 GHz 6-core Intel Core i5
GPU: Radeon Pro 560X 4 GB

[cwfitzgerald]

I'll give this a shot on my M1 to see if it's a generic issue probably next week

[jimblandy]

For Firefox's sake, let's call this a P1, unless we can't reproduce, in which case we'll mark it P2.

[cwfitzgerald]

Cannot reproduce on an M1. Boids does not function at all on MVK (and in fact freezes my machine when powering a window), but runs fine on metal, without any kind of leak, no matter what I tried. debug/release, minimizing, etc.

I'm not sure what exact models have fusion drives, but it seems to be an intel based model. Maybe this is different.

Dropping to P2

[cwfitzgerald]

@Aultus-defora can you tell your machines cpu/gpu spec?

[Aultus-defora]

CPU: 3 GHz 6-core Intel Core i5
GPU: Radeon Pro 560X 4 GB

[Aultus-defora]

For the record, Firefox does not have this problem on my machine. Using WASM build of bevy, which is where I found this bug to begin with, also does not inherit this memory leak.

[cwfitzgerald]

Alright, we can't reproduce it, so we'll need some help investigating this. If you can run the examples through apple's memory profiler within Instruments? It's hard to find a guide, but https://developer.apple.com/documentation/xcode/gathering-information-about-memory-use#Profile-your-app-using-the-Allocations-instrument may help?