Hi, Thanks for testing things out!
On 2018-01-26 10:44:24 +0300, Konstantin Knizhnik wrote: > Also I noticed that parallel execution didsables JIT. Oh, oops, I broke that recently by moving where the decisition about whether to jit or not is. There actually is JITing, but only in the leader. > Are there any principle problems with combining JIT and parallel execution? No, there's not, I just need to send down the flag to JIT down to the workers. Will look at it tomorrow. If you want to measure / play around till then you can manually hack the PGJIT_* checks in execExprCompile.c with that done, on my laptop, tpch-Q01, scale 10: SET max_parallel_workers_per_gather=0; SET jit_expressions = 1; 15145.508 ms SET max_parallel_workers_per_gather=0; SET jit_expressions = 0; 23808.809 ms SET max_parallel_workers_per_gather=4; SET jit_expressions = 1; 4775.170 ms SET max_parallel_workers_per_gather=4; SET jit_expressions = 0; 7173.483 ms (that's with inlining and deforming enabled too) Greetings, Andres Freund
