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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. Brandur‏ @brandur 24 Oct 2018
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      On the incompleteness of C: Postgres is a database, but also a runtime (fully custom memory management infrastructure), a standard library (custom string builder, linked list, hash map, sorting, ...), and even language (custom longjmp-based try/catch/raise mechanisms).

      4 replies 9 retweets 80 likes
    2. Andres Freund (Tech)‏ @AndresFreundTec 24 Oct 2018
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      Replying to @brandur

      Part of that is due to C's incompleteness, yes. But a lot of that would be self implemented when implementing a mature database in just about any language.

      1 reply 1 retweet 6 likes
    3. Andres Freund (Tech)‏ @AndresFreundTec 24 Oct 2018
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      Replying to @AndresFreundTec @brandur

      (But other languages would make that far less cumbersome)

      1 reply 0 retweets 3 likes
    4. Brandur‏ @brandur 24 Oct 2018
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      Replying to @AndresFreundTec

      True! With or without C, I suppose there’s some implicit wisdom that any sufficiently complex system will accumulate enough custom/complex requirements that it should expect to reimplement/significantly augment large parts of its substrate.

      1 reply 0 retweets 3 likes
    5. Andres Freund (Tech)‏ @AndresFreundTec 24 Oct 2018
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      Replying to @brandur

      Right. Databases in particular have special enough needs that generic code often isn't a great fit.

      1 reply 0 retweets 2 likes
      Andres Freund (Tech)‏ @AndresFreundTec 24 Oct 2018
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      Replying to @AndresFreundTec @brandur

      E.g. while there's parts of PG that'd benefit from a GC, it'd be a bad idea to rely on it for the majority of a query's memory. Having many gigabytes of memory that need to be GCed will lead to pauses, especially when consisting out of many small allocations.

      10:18 AM - 24 Oct 2018
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      2 replies 0 retweets 4 likes
        1. Andres Freund (Tech)‏ @AndresFreundTec 24 Oct 2018
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          Replying to @AndresFreundTec @brandur

          Parts that'd benefit from GC: Much easier lock-free algorithms.

          0 replies 0 retweets 1 like
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        2. Jacob Matthews‏ @jashmatthews 24 Oct 2018
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          Replying to @AndresFreundTec @brandur

          Does CockroachDB use GC for the query memory but manual allocation via RocksDB for the storage backend? I read a few of their articles on the Go GC.

          1 reply 0 retweets 1 like
        3. Andres Freund (Tech)‏ @AndresFreundTec 24 Oct 2018
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          Replying to @jashmatthews @brandur

          I don't know Cockroach well enough to answer, sorry. Suspect that problem isn't as big for them because they're not really targeting analytics workloads. Therefore queries don't need much memory, and "request based" GCs are reasonable. OTOH oltp is more latency sensitive.

          0 replies 0 retweets 2 likes
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