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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
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    2. Andres Freund (Tech)‏ @AndresFreundTec Feb 6
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      Can do some by ensuring that all of PG's allocations are populated / backed by actual memory immediately (e.g. by only using mmap(MAP_POPULATE) to back allocations). But that still leaves library etc code not doing so.

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    3. Andres Freund (Tech)‏ @AndresFreundTec Feb 6
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      If we did that, combined with the already existing oom scoring adjustments, it should make it fairly unlikely for PG to get killed. Unfortunately, even with overcommit_memory=2, there's a few holes in the protection. E.g. there appears not to be any reservation for stack space.

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    4. Andres Freund (Tech)‏ @AndresFreundTec Feb 6
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      So if postgres connection uses more stack space than previously (but under our limit), it can get killed because there are no pages to back the extended stack. We could explicitly reserve the maximum stack at backend start, but that'd be pretty wasteful: Rarely need that much.

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      Andres Freund (Tech)‏ @AndresFreundTec Feb 6
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      Perhaps we could make our stack-depth-checking function ensure that current_stack_depth + 1/10th max_stack_depth is backed by actual memory? Keeping a high watermark of how far we've guaranteed that, to avoid redundant syscalls?

      3:41 PM - 6 Feb 2020
      0 replies 0 retweets 0 likes

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