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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. Andres Freund (Tech)‏ @AndresFreundTec Feb 6
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      Andres Freund (Tech) Retweeted Andres Freund (Tech)

      Also reminds me that I really would like to find a way that PG can detect allocation failures without requiring memory overcommit to be turned off globally. Just causes too many other programs to misbehave, and is a complicated explicit configuration.https://twitter.com/AndresFreundTec/status/1225559052475871233 …

      Andres Freund (Tech) added,

      Andres Freund (Tech) @AndresFreundTec
      Nice. Was concerned when I saw @herbsutter's C++ deterministic exception proposal. Particularly that it'd forever prevent postgres to migrate to C++ (from C), as we need to/do handle out-of-memory errors. Revisions partially address my concerns. http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0709r4.pdf …
      Show this thread
      2 replies 2 retweets 7 likes
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    2. Dimitri Fontaine‏ @tapoueh Feb 7
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      Replying to @AndresFreundTec

      Maybe linux should (or at least could) provide an API for applications to override the system wide setting. Seems to me that a per application approach makes sense here. « Hey I know what to do when malloc returns NULL, thanks ».

      1 reply 0 retweets 1 like
    3. Andres Freund (Tech)‏ @AndresFreundTec Feb 7
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      Replying to @tapoueh

      "Hey I know what to do when malloc returns NULL, thanks" - that's not why this happens. The issue is that most programs allocate more memory than they use, so if you only give out as much memory as if every program used all memory, you fail too early.

      1 reply 0 retweets 0 likes
    4. Andres Freund (Tech)‏ @AndresFreundTec Feb 7
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      Replying to @AndresFreundTec @tapoueh

      So linux (many other OSs do similarly) just doesn't count unused but allocated memory, unless you enable strict memory accounting. But when you then access the memory (by just dereferencing a pointer) and there is no actual free memory left, there is nothing to return NULL to.

      1 reply 0 retweets 0 likes
    5. Andres Freund (Tech)‏ @AndresFreundTec Feb 7
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      Replying to @AndresFreundTec @tapoueh

      So if they can't make space, they have to just kill that, or some other program. The reason for telling you that, is that it's not clear what turning overcommitting off "per application" would precisely mean. Memory is a global resource after all.

      1 reply 0 retweets 0 likes
    6. Andres Freund (Tech)‏ @AndresFreundTec Feb 7
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      Replying to @AndresFreundTec @tapoueh

      What you would have to do to make sure you never run into not having memory available to back an earlier allocation, is to always immediately back it with memory, while the OS can signal an error. But that a) isn't easy b) has some DOS potential and such.

      1 reply 0 retweets 0 likes
      Andres Freund (Tech)‏ @AndresFreundTec Feb 7
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      Replying to @AndresFreundTec @tapoueh

      MAP_POPULATE, mentioned earlier, is basically a way to achieve that. But we also do not necessarily *want* that for everything - it's wasteful to use up memory for some of these things.

      10:11 AM - 7 Feb 2020
      1 reply 0 retweets 0 likes
        1. Dimitri Fontaine‏ @tapoueh Feb 7
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          Replying to @AndresFreundTec

          Thanks for the additional details. Once more I had a much simplified model in mind. Will have to think about that more I guess.

          0 replies 0 retweets 2 likes
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