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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 5 Jul 2019
      • Report Tweet
      • Report NetzDG Violation

      Okay, why does `swapoff` exist on Linux? It's completely useless as far as I can tell. It's been running for 24h to swap in like 1.5GB of used swap or so, on a largely idle server with >32GB free RAM. How can it be *this* hilariously inefficient?

      12 replies 3 retweets 62 likes
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    2. Hector Martin‏ @marcan42 5 Jul 2019
      • Report Tweet
      • Report NetzDG Violation

      This is what it's done over the past 24h. It got rid of most of it quickly, and then the last 100MB or so are taking forever to swap in. WTF? Over the last 50 minutes it seems it hasn't managed to swap in a single page, but it's doing I/O. What is this, an O(nᴸᴼᴸ) algorithm?pic.twitter.com/RArORjswRX

      8 replies 4 retweets 66 likes
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    3. Grant Taylor‏ @DrScriptt 6 Jul 2019
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      Replying to @marcan42

      Can you give it swap elsewhere? Is it swapping other things out of memory to make room to take other things out of swap? What were you doing that had ~2 GB into swap? What does free show?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 6 Jul 2019
      • Report Tweet
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      Replying to @DrScriptt

      I said I have 32GB of free RAM. There is zero reason for it to have trouble swapping things in. The server has never run out of RAM. It just got close enough (80% usage peak) for Linux to decide to start swapping a few things out preemptively.

      12:14 AM - 6 Jul 2019
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      • ash 🦉
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