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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. John Regehr‏ @johnregehr Apr 9

      a big advantage of 32-bit executables is they die with allocation failure instead of sending a machine into swapping hell change my mind

      14 replies 16 retweets 89 likes
    2. Alexander Tarasikov‏ @astarasikov Apr 9
      Replying to @johnregehr

      Swap is harmful, fight me

      3 replies 0 retweets 14 likes
    3. whitequark‏ @whitequark Apr 9
      Replying to @astarasikov @johnregehr

      you need swap for hibernation

      4 replies 0 retweets 2 likes
      Rich Felker‏ @RichFelker Apr 9
      Replying to @whitequark @astarasikov @johnregehr

      Yes but that's a Linux design flaw in hibernation. You shouldn't need it.

      8:25 AM - 9 Apr 2018
      • 4 Likes
      • Brian H₂O's Oleg (\/) ( ͡°,,,°) (\/) Axel Gneiting
      3 replies 0 retweets 4 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS Apr 9
          Replying to @RichFelker @whitequark and

          Can use a swapfile rather than a swap partition though. Have 64GB of memory and an 128GB swapfile for hibernation via apcupsd when the UPS has gotten below the 5% power threshold. It never uses the swap in regular use even without tuning anything, so it doesn't really matter.

          2 replies 0 retweets 1 like
        3. CopperheadOS‏ @CopperheadOS Apr 9
          Replying to @CopperheadOS @RichFelker and

          Swap on an NVMe drive is perfectly usable anyway. It wouldn't grind the machine to a halt if it started using it. It would be substantially slower, but these things have fairly insane specs: https://www.samsung.com/us/computing/memory-storage/solid-state-drives/ssd-960-pro-m-2-2tb-mz-v6p2t0bw/ … It'd probably get throttled without good M.2 cooling though.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker Apr 9
          Replying to @CopperheadOS @whitequark and

          Sure it would, just because Linux's swap code paths are so bad. Even swap on a MTD backed by DDR DRAM causes the system to grind to a halt if memory pressure gets so high that each access has a significant chance of page fault.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS Apr 9
          Replying to @RichFelker @whitequark and

          Haven't had that experience. Doesn't zram, etc. get treated as swap too?

          1 reply 0 retweets 0 likes
        6. Rich Felker‏ @RichFelker Apr 9
          Replying to @CopperheadOS @whitequark and

          I think so but I'm not sure. Again the problem is thrashing, which only happens when you've actually allocated and tried to make heavy use of a lot more memory than available physical ram.

          0 replies 0 retweets 0 likes
        7. End of conversation
        1. Rich Felker‏ @RichFelker Apr 9
          Replying to @RichFelker @whitequark and

          Or more precisely, adding swap would not add to commit limit in a way you can't turn off, so you could have swap without it actually being usable for satisfying allocation, just for hibernation.

          0 replies 0 retweets 1 like
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        1. Brian H₂O's‏ @int10h Apr 10
          Replying to @RichFelker @whitequark and

          So many truth flakes in this thread no fight just love ok

          0 replies 0 retweets 1 like
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