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RhodiumToad's profile
RhodiumToad
RhodiumToad
RhodiumToad
@RhodiumToad

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RhodiumToad

@RhodiumToad

Find me on IRC: #postgresql or #freebsd on http://freenode.net . (he/him)

Joined February 2019

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    1. Lætitia‏ @l_avrot 19 Sep 2019
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      Lætitia Retweeted Lukas Eder

      Please #PostgreSQL hackers, we'd like to understand the significant performance difference between count(*) and count(1).https://twitter.com/lukaseder/status/1174621016187973632 …

      Lætitia added,

      Lukas Eder @lukaseder
      Replying to @l_avrot @pg_xocolatl and 6 others
      Well, I'd love to hear why it's so significant. Am I doing something substantially wrong in my benchmark? Can you folks reproduce it? Code here: https://gist.github.com/lukaseder/2611212b23ba40d5f828c69b79214a0e …
      1 reply 2 retweets 4 likes
      Show this thread
    2. Lukas Eder‏ @lukaseder 19 Sep 2019
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      Replying to @l_avrot

      Could you reproduce it?

      1 reply 0 retweets 0 likes
    3. Lætitia‏ @l_avrot 19 Sep 2019
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      Replying to @lukaseder

      Hi Lukas, I'm running a Postgres 13 on MacOS (without any tuning) and wasn't able to reproduce it. It seems statement 1 performs slightly better, but the difference is so tiny, it could be just luck... @pg_xocolatl @RhodiumToad : What do you think ?pic.twitter.com/KWFAOTxPsV

      2 replies 0 retweets 1 like
    4. RhodiumToad‏ @RhodiumToad 20 Sep 2019
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      Replying to @l_avrot @lukaseder @pg_xocolatl

      Was JIT enabled and was it used for this query? Because in my tests that seems to make a big difference.

      1 reply 0 retweets 0 likes
    5. Lætitia‏ @l_avrot 20 Sep 2019
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      Replying to @RhodiumToad @lukaseder @pg_xocolatl

      As the jit value default is on for postgres 13, I assume it is enabled, but I'll check.

      1 reply 0 retweets 0 likes
    6. RhodiumToad‏ @RhodiumToad 20 Sep 2019
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      Replying to @l_avrot @lukaseder @pg_xocolatl

      Whether JIT is actually used for a given query depends on plan costs vs. the jit_above_cost settings, so it's worth checking the explain analyze of the test query

      1 reply 0 retweets 0 likes
    7. Lætitia‏ @l_avrot 23 Sep 2019
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      Replying to @RhodiumToad @lukaseder @pg_xocolatl

      So, here are my `jit` settings. And both explain plans. The planner consider that the costs are the same for both queries and used the same plan for both.pic.twitter.com/oztp4omkiv

      1 reply 0 retweets 0 likes
    8. RhodiumToad‏ @RhodiumToad 23 Sep 2019
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      Replying to @l_avrot @lukaseder @pg_xocolatl

      So JIT is not in play in your test since the costs aren't high enough. How repeatable are your timings? Can you try the generate_series version?

      1 reply 0 retweets 0 likes
    9. Lætitia‏ @l_avrot 23 Sep 2019
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      Replying to @RhodiumToad @lukaseder @pg_xocolatl

      I tried and tried again with an even larger set, couldn't find jit involved in explain planspic.twitter.com/2uNw1H7cd2

      1 reply 0 retweets 0 likes
      RhodiumToad‏ @RhodiumToad 23 Sep 2019
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      Replying to @l_avrot @lukaseder @pg_xocolatl

      Did you compile with the --with-llvm option? (you can check via select setting from pg_config where name='CONFIGURE';) What are your actual timings for the generate_series version of the test?

      10:58 PM - 23 Sep 2019
      2 replies 0 retweets 0 likes
        1. Lætitia‏ @l_avrot 24 Sep 2019
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          Replying to @RhodiumToad @lukaseder @pg_xocolatl

          No compilation option at all. It's really a "basic" postgres 13 installation. I followed Postgres documentation to compile it.

          0 replies 0 retweets 0 likes
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        2. Andres Freund (Tech)‏ @AndresFreundTec 23 Sep 2019
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          Replying to @RhodiumToad @l_avrot and

          Also SELECT pg_jit_available();

          1 reply 0 retweets 1 like
        3. Lætitia‏ @l_avrot 24 Sep 2019
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          Replying to @AndresFreundTec @RhodiumToad and

          You may have found it. I compiled Postgres 13 without any option. Is it the default ?pic.twitter.com/W224LfbjF9

          1 reply 0 retweets 0 likes
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