Set a new default for the Puma thread count · Issue #50450 · rails/rails

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[YassLab]

“We currently set the default Puma thread count to 5. That's very high. / It's not a good default for apps with quick SQL queries and 3rd party calls running via jobs / So let's find a way to benchmark our way to a good, new default that works for most people, most of the time. ”

[ohbarye]

Rails7.2でpumaのthread数が5から3へ変更される議論。スレッドを増やすとスループットは向上するがGVLやスレッドスイッチコストでレイテンシは下がる。IO待ち時間比や負荷によっても正解は変わるので難しい