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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
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      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
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      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. Hector Martin‏ @marcan42 6 Jul 2019
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      It's managed to swapoff, er, about 100KiB since that tweet (~10h)? So it's not *stuck*, but you could ask someone trained in telegraphy to transmit the swapspace contents in morse code manually and it would be faster.

      3 replies 3 retweets 27 likes
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    4. Hector Martin‏ @marcan42 6 Jul 2019
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      Disk stats say it's *writing* 6MB/s of stuff, at 1400 IOPS or so (plausible for spinning rust on battery backed RAID card), 80% I/O usage, paging "out" 1400 pages per second. What? Why is it paging stuff *out* with >32GB of RAM free?

      10 replies 0 retweets 12 likes
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    5. Grant Taylor‏ @DrScriptt 7 Jul 2019
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      Replying to @marcan42

      It really sounds like it’s refilling swap at just about the same speed that it’s draining swap. What is swappiness set to? I’d have to look up the details to interpret.

      1 reply 0 retweets 0 likes
    6. Grant Taylor‏ @DrScriptt 7 Jul 2019
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      Replying to @DrScriptt @marcan42

      https://access.redhat.com/solutions/103833 …

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 7 Jul 2019
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      Replying to @DrScriptt

      I know what swappiness is, and there is no reason for it to be swapping things out at neither the previous setting or 60 nor the current setting of 0.

      2:43 AM - 7 Jul 2019
      1 reply 0 retweets 0 likes
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        1. Grant Taylor‏ @DrScriptt 7 Jul 2019
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          Replying to @marcan42

          ACK I just wanted to make sure that you had the information. I'm glad that you did. Sorry, I don't have any idea why your machine's behaving the way that it is. Can you extract any information from /proc or /sys as to how much each process has swapped?

          1 reply 0 retweets 0 likes
        2. Grant Taylor‏ @DrScriptt 7 Jul 2019
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          Replying to @DrScriptt @marcan42

          Maybe identifying what is partially swapped will help shed some light on why it's swapped. Silly question: Can suspended / stopped processes be swapped or unswapped? I would expect that they can. But I don't know.

          0 replies 0 retweets 0 likes
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