this post was submitted on 16 Aug 2023
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It isn't a direct line to connect, sorry if I am bad at explaining it. The P and E cores mix are the issue. The P cores are Xeon designs that (may) have the extra instructions. The E cores do not. If simply turning off the E cores has made the P cores show up with AVX512 on some systems, I imagine it may have to do with the scheduler. I could be wrong.
The CPU scheduler will require some kind of management function that could bind the process to a core with the extra AVX instructions without manual intervention. This would need to override availability, kernel threads, and things like power efficiency or spin up optimisation. I haven't taken a super deep dive into how the scheduler is working on a 12th gen. I can say it appears to pin processes more, but I still see a regular rotation of most running processes across cores when they have no affinity or isolation settings, like when I am running a large LLM.