On Sep 27, 2024, at 12:49, Mårten Nordheim via Development <development@qt-project.org> wrote:
-----Original Message----- From: Volker Hilsheimer <volker.hilshei...@qt.io<mailto:volker.hilshei...@qt.io>> Sent: torsdag 26. september 2024 17:18 To: Mårten Nordheim <marten.nordh...@qt.io<mailto:marten.nordh...@qt.io>>; development@qt- project.org<http://project.org/> Subject: Re: [Development] Thread / Process Quality of Service APIs in Qt On 24 Sep 2024, at 23:23, Mårten Nordheim via Development <development@qt-project.org<mailto:development@qt-project.org>> wrote: Hello, For a while now there has been "Quality of Service" APIs available for threads and processes in at least Apple and Windows. Typically you can request either "Eco", and Default (i.e. the OS does its normal thing) [...] Thanks, Mårten Based on my interpretation, I think we can start with a low-level but dirt- simple API that allows applications set a preferred CPU core type (e.g. Eco vs Default) on which a thread might run, together with the existing thread priority. Coupling thread priority and preferred CPU type into a “task type” or “load category” as a convenient, higher-level abstraction can be a follow-up, utilising the former lower-level API. Good naming of those seems hard; I’d stay away from domain specific task type names like “AudioProcessing”. Not sure if it’s useful to have a QCoreApplication API in addition to a QThread API; I’d expect that calling the static QThread setters from main() would be the same as calling the QCoreApplication setter. Volker On Windows there is an API for setting it on the process-level. And I thought there was one for macOS as well, but it seems to be more focused on labelling the workloads that the application is doing, rather than labelling the whole application. So, thread-specific is a safe choice. Sounds good. A minimal API for the QoS seems like a good start in any case, even if we later decide on a higher level “workload” categorization API. Tor Arne
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