Woohooo. Worked on this for a long while. I think this graph, of the first set of improvements, says enough:pic.twitter.com/PqwuUqxPL9
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The dip for master is interesting, but looks unrelated to the connection scalability itself. Within that band the linux scheduler uses more IPIs, which triggers hypercalls, which are expensive. Below/Above that it doesn't do that at the same rate.
Nice stuff! Do you think this will still land fir pgsql13?
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