13:58 <alyssa> I think I want to tackle the context switching issues today

13:58 <alyssa> Not streaming, too much pressure

13:59 <alyssa> I just want this bug fixed because it's been killing my motivation to work on this driver

14:03 <Sobek[m]> What’s that issue exactly ? Well best luck (and I wouldn’t be able to stream my daily dev, so I won’t be offended at all if you keep your dev to yourself).

14:04 <alyssa> Sometimes -- depending on the GPU time elapsed and the GPU workload elsewhere on the system -- the system (macOS kernel or AGX firmware) decides to context switch the GPU.

14:04 <alyssa> Preempting our rendering and restoring it later

14:04 <alyssa> This mechanism is broken with Metal -- it never restores (or maybe never saves state when preempted)

14:04 <alyssa> I don't know why, and it means that the driver randomly stops working

14:10 <Sobek[m]> So normal processes end up detecting that they’ve been context switched and re-set up their pipeline ? Is it possible to observe the way the apple driver handles it ?

14:10 <Sobek[m]> (I could see a few solutions / explanations as someone with no clue about the system 1. Normal Apple driver detects switch out and re-set up, 2. Some callbacks are involved and not implemented by your driver 3. Some special set up (like a buffer for context switched out data) is required and missing in your driver, but reminder that I am curious and clue less)

14:10 <Sobek[m]> (And urgh random bugs are the worse :/)

14:47 <alyssa> Yes.

14:47 <alyssa> #3 is the most likely, given the overheads involved in #1 and #2

18:08 <alyssa> Think I will stream after all

18:10 <Tramtrist> just made it into japan a few hours ago.. wouldnt mind having something to fill my jet lagged time with

18:10 <Tramtrist> 👀

18:12 <alyssa> https://twitch.tv/asahigpu

18:20 <ah-[m]> \o/

19:26 <Andy99> @Alyssa, Hi, I have a question. How far we're from "public" testing? :)

19:34 <Dcow[m]1> alyssa: thank you for the stream

19:38 <alyssa> :)

19:56 <Sobek[m]> Did you catch the bug ?

22:02 <alyssa> No :(