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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 30 Dec 2020
      • Report Tweet
      • Report NetzDG Violation

      Now the question is, how terrible of an idea is it to try playing VR games on my Threadripper in a VM while it's compiling Gentoo packages? I mean, emerge is niced, I have an NVMe drive, and RAM to spare. It *should* work... right? The scheduler *should* handle it, right? Right?

      14 replies 0 retweets 114 likes
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    2. Hector Martin‏ @marcan42 30 Dec 2020
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      Report: that worked until GCC started compiling. Turns out no, the scheduler cannot handle it. VM was already isolated to one NUMA node, so now I'm sending emerge off to the other one (CPUs only, let's let it use all free RAM).

      2 replies 0 retweets 46 likes
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    3. Hector Martin‏ @marcan42 30 Dec 2020
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      Yup, that worked fine. A few dropped frames here and there while compiles were pegging one side, but nothing terrible. Beat Saber plays fine.

      1 reply 0 retweets 41 likes
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    4. John Kelley‏ @JohnHedge 30 Dec 2020
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      Replying to @marcan42

      Oh nice, it was just GCC competing on the other threads of the CCX that the VM was on?

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 30 Dec 2020
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      Replying to @JohnHedge

      Oh it was GCC competing on *all* the threads the VM was on. The VM was pinned, but GCC wasn't so it was trampling over everything (I was hoping the scheduler would prioritize the VM enough, but I guess it's not good enough to keep latencies low).

      1 reply 0 retweets 1 like
    6. John Kelley‏ @JohnHedge 30 Dec 2020
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      Replying to @marcan42

      Ah that makes sense. I assume isolcpus isn’t appropriate here since the VM isn’t always running?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 30 Dec 2020
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      Replying to @JohnHedge

      Correct.

      9:17 AM - 30 Dec 2020
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