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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori 1 Mar 2016
      Replying to @rygorous

      @rygorous But it's not "flat" physically, right. The OS could do whatever it wanted, and you could be seeking all over the place.

      2 replies 0 retweets 1 like
    2. Fabian Giesen‏ @rygorous 1 Mar 2016
      Replying to @cmuratori

      @cmuratori Trusting on underlying FS to not fragment data unduly, especially with an append-only use case, does not seem very dubious?

      2 replies 0 retweets 0 likes
    3. Casey Muratori‏ @cmuratori 1 Mar 2016
      Replying to @rygorous

      @rygorous It's not just that though, it's also the fact that seeking in a large file can be traversing all sorts of stuff at the FS layer.

      1 reply 0 retweets 0 likes
    4. Fabian Giesen‏ @rygorous 1 Mar 2016
      Replying to @cmuratori

      @cmuratori The only thing that traverses is the inode + allocation blocks/extent tree though.

      1 reply 0 retweets 0 likes
    5. Fabian Giesen‏ @rygorous 1 Mar 2016
      Replying to @rygorous

      @cmuratori For separate files you have a lot of wasted space in the kernel memory cache there, for PAK files you don't.

      1 reply 0 retweets 0 likes
    6. Fabian Giesen‏ @rygorous 1 Mar 2016
      Replying to @rygorous

      @cmuratori That's not exactly controversial; "FS caching of 1000s of small files doesn't work great" is one of the reasons games use PAKs!

      1 reply 0 retweets 0 likes
    7. Casey Muratori‏ @cmuratori 1 Mar 2016
      Replying to @rygorous

      @rygorous I'm not sure why you keep talking about separate files? Nobody is talking about that? At least I am not?

      2 replies 0 retweets 0 likes
    8. Casey Muratori‏ @cmuratori 1 Mar 2016
      Replying to @cmuratori

      @cmuratori @rygorous I'm just talking about the fact that if you want to ensure "1 physical IO per image", then that's very hard to do.

      2 replies 0 retweets 0 likes
    9. Mārtiņš Možeiko‏ @mmozeiko 1 Mar 2016
      Replying to @cmuratori

      @cmuratori @rygorous Paper says "the blockmaps for several contiguous large files can be small enough to be stored in main memory"

      1 reply 0 retweets 0 likes
    10. Mārtiņš Možeiko‏ @mmozeiko 1 Mar 2016
      Replying to @mmozeiko

      @cmuratori @rygorous And "This benefit does not imply that Haystack can guarantee every photo read will incur exactly one disk operation."

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 1 Mar 2016
      Replying to @mmozeiko

      @mmozeiko @rygorous Yes, that is what the paper says, that is not what the _lecture_ says :)

      10:22 PM - 1 Mar 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Casey Muratori‏ @cmuratori 1 Mar 2016
          Replying to @cmuratori

          @cmuratori @mmozeiko @rygorous The paper also talks about the aforementioned necessity for XFS.

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori 1 Mar 2016
          Replying to @cmuratori

          @cmuratori @mmozeiko @rygorous For the paper, I felt "this is not at all interesting and is all very obvious."

          2 replies 0 retweets 0 likes
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