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AndresFreundTec's profile
Andres Freund (Tech)
Andres Freund (Tech)
Andres Freund (Tech)
@AndresFreundTec

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Andres Freund (Tech)

@AndresFreundTec

Postgres developer, working at Microsoft. Also: politics nerd, expat German in the US. Account for tech related things. For politics: @AndresFreundPol

San Francisco, CA
Joined August 2017

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    1. Jens Axboe‏ @axboe 6 Apr 2019
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      Now that io_uring will be in the upcoming 5.1 kernel, I spent some time writing up how it came to be and how it works. More formats likely coming, and I expect a few revisions too. For now, consider this v1.0 of the doc: http://kernel.dk/io_uring.pdf 

      10 replies 72 retweets 222 likes
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    2. Jens Axboe‏ @axboe 6 Apr 2019
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      Do let me know if you have any comments. Anything from "you spelled this word wrong" to "I wish it included X" would be appreciated.

      7 replies 0 retweets 2 likes
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    3. Andres Freund (Tech)‏ @AndresFreundTec 6 Apr 2019
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      Replying to @axboe

      It'd be cool if you could include a bit more about f[data]sync (synchronicity, guarantees). Lots of users of the facility are going to need it... Plan to play around with optionally using this in postgres in the next few months.

      3 replies 0 retweets 1 like
    4. Jens Axboe‏ @axboe 6 Apr 2019
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      Replying to @AndresFreundTec

      Agree, that would be useful. One thing I've been pondering is a barrier type command. Right now you can queue an fsync after a bunch of writes, but ordering is not guaranteed. It'd be nifty to have explicit ordering be possible for that, fsync not issued before pending writes.

      1 reply 0 retweets 2 likes
    5. Andres Freund (Tech)‏ @AndresFreundTec 6 Apr 2019
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      Replying to @axboe

      Yea, that'd really be useful. Requiring a userspace 'queue drain' at that point seems a) unnecessarily slow b) failure prone.

      1 reply 0 retweets 0 likes
    6. Jens Axboe‏ @axboe 6 Apr 2019
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      Replying to @AndresFreundTec

      It runs counter to what the API is trying to achieve, having applications needing to care about those kinds of details. And it's non-trivial. I'll dust off the barrier implementation and provide an IORING_FSYNC_BARRIER flag for that use case.

      1 reply 0 retweets 1 like
    7. Jens Axboe‏ @axboe 6 Apr 2019
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      Replying to @axboe @AndresFreundTec

      OK done, now I just need to test it. Almost not worth the time, I'm sure it's perfect. Yeah.

      1 reply 0 retweets 3 likes
      Andres Freund (Tech)‏ @AndresFreundTec 6 Apr 2019
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      Replying to @axboe

      Agree, it's durability, who cares. Which git tree will this appear in first? Just curious to skim through it.

      4:14 PM - 6 Apr 2019
      1 reply 0 retweets 0 likes
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        2. Jens Axboe‏ @axboe 6 Apr 2019
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          Replying to @AndresFreundTec

          Once I get a chance to test it, I'll push out a patch to my io_uring-next branch. I'll let you know, if you want to check/test. Might not be until Monday, time to shut it down for the weekend...

          1 reply 1 retweet 1 like
        3. Andres Freund (Tech)‏ @AndresFreundTec 6 Apr 2019
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          Replying to @axboe

          Cool. Sunday is postgres' equivalent to the end of the merge window - except that we have yearly releases. So I'm not going to play with anything until that's done, and then I'm going to sleep for 24h :P. I'll probably play around it later next week though. Have fun!

          1 reply 0 retweets 1 like
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