On Wed, May 29, 2019 at 10:48:19AM +0200, Andreas Joseph Krogh wrote: > På onsdag 29. mai 2019 kl. 10:02:50, skrev Tobias Gierke <tobias.gierke@xxxxxxxxxxxxxxxx> > Hi, > > Browsing the PostgreSQL 12 release notes I noticed that JIT is now > enabled by default. Having not followed PostgreSQL development closely - > does this mean that compilation results are now getting cached and > compilation is no longer executed separately for each worker thread in a > parallel query ? Thanks for starting the conversation. > I don't know, but just want to chime in with my experience > with PG-12 and JIT: Execution-time is still way worse then JIT=off for your > queries so we'll turn JIT=off until we can mesure performance-gain. That's also been my consistent experience and conclusion. I gather the presumption has been that JIT will be enabled by default.. ..but perhaps this is a "Decision to Recheck Mid-Beta" (?) Justin
