Hi I played with it and maybe I got interesting result.
When I played with really big table, then I got IO waits and effect of jit_tuple_deforming is near to zero (as expected) When I played with smaller table under RAM, then I can see positive effect of JIT_TD, but only when optimization is active. When optimization was false, then JIT_TD has negative slowdown. Shared buffers 1GB table wt .. 100columns, 2M rows, cca 823MB set max_parallel_workers to 0; query: select sum(c99) from wt; default (jit active) ... 1853ms set jit_tuple_deforming to off .. 1397ms set jit off .. 1400ms == enforced inline == jit_tuple_deforming on .. 1610ms jit_tuple_deforming off .. 1420ms == enforced optimize == jit_tuple_deforming on .. 842ms jit_tuple_deforming off .. 1420ms I played with setting and I got the best speed with jit_inline_above_cost ..some pretty high number jit_optimize_above_cost 0 jit_tuple_deforming on So I am able to see effect of jit_tuple_deforming, and very well, but only if optimization is active. When optimization is not active then jit_tuple_deforming does slowdown. So maybe a usage of jit_tuple_deforming can be conditioned by jit_optimization? Regards Pavel
