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?
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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
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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.
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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?
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