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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 27 Jun 2019
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      Bufferbloat, rotational disk + BBU style. In case you still you magnetic disks to back a database taking writes, it can be worthwhile to disable "intelligent" controllers that do their own caching/readahead:pic.twitter.com/OoNs560vNU

      1 reply 2 retweets 15 likes
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    2. Andres Freund (Tech)‏ @AndresFreundTec 27 Jun 2019
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      By collecting a lot of random writes in the BBU's writeback cache, and causing additional IOs for it's internal readahead, IO latencies grow absurdly. And on e.g. plenty LSI SAS controllers, the queue management for that is wholly unusable.

      2 replies 0 retweets 0 likes
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    3. Andres Freund (Tech)‏ @AndresFreundTec 27 Jun 2019
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      Note that for other workloads, with fewer random writes (e.g. increasing shared buffers to contain the whole working set, making small sequential writes more important by using logged tables in an OLTP setup) and more synchronous writes that's not true:pic.twitter.com/B8ru6zbsFf

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    4. Bruno Lavoie‏ @bruno_lavoie 17 Jul 2019
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      Replying to @AndresFreundTec

      what do you use for your benchmarking (loadgen) ans as metric collection? :)

      1 reply 0 retweets 0 likes
    5. Andres Freund (Tech)‏ @AndresFreundTec 17 Jul 2019
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      Replying to @bruno_lavoie

      The benchmark here is just postgres' pgbench. The metrics are a combination of self written tools, and wrappers around tools like iostat (parsing it into separate CSV files). Then a scripts which loads them into pandas, and uses matplotlib to generates the graphss.

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      Andres Freund (Tech)‏ @AndresFreundTec 17 Jul 2019
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      Replying to @AndresFreundTec @bruno_lavoie

      Plan to publicize that set of scripts.

      3:53 PM - 17 Jul 2019
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