Hi Makis, Use a profiler (e.g., VisualVM) and check where the time goes. You can also compare the snapshots between the two machines.
Best, Stamatis On Tue, Oct 15, 2019 at 3:08 PM Michael Mior <mm...@apache.org> wrote: > I think it's going to be hard for anyone to give you specific advice > without more information. How are you measuring the runtime? You may > need to instrument the Calcite code, but I would suggest breaking down > the runtime more to find out where the slowdown is happening. On a > related note, the optimization process is single-threaded, so this > would not be your problem. > -- > Michael Mior > mm...@apache.org > > Le mar. 15 oct. 2019 à 06:11, Serafeim (Makis) Papadias > <makisnt...@gmail.com> a écrit : > > > > Hello everyone, > > > > I am experimenting with rules and volcano optimiser lately and I am > facing something weird. I run my code through Intellij IDE. The databases > are set the same way in both machines and since I care only about query > rewriting for now I just read the table schemas from the databases; I do > not execute anything. > > > > The same code on one machine runs 10 times slower than on the other > machine. > > > > * I tried to rule out that the IDE is not the problem, so I installed > the same versions and picked the exact same vmoptions. > > * The database schemas are the same, thus I do not believe it is related > with the underneath sources. > > > > Is it possible that calcite uses all the threads available on one > machine while running only on thread the other? > > > > If you have any recommendations, they are more that welcome! > > > > Thanks in advance. > > > > Best, > > Makis >
