Why are Java Engines slow in Tournament mode?

[swami]

Either it takes so much hash size or Java consumes enough space and still the GUI freezes.

Some of the engines that play slow

Flux
Mediocre

Flux dont seem to work at all.
Mediocre works but it is quite slow compared to other non java engines.

I wonder if this has to do with programming language the engine was written in or something?

[Dr.Wael Deeb]

hi pal,
Flux works fine as a uci installed engine,I test Flux 0.9 and Flux 2.1
As for Mediocre,it works fine as a winboard installed program....

[swami]

hi pal,
Flux works fine as a uci installed engine,I test Flux 0.9 and Flux 2.1
As for Mediocre,it works fine as a winboard installed program....

Hi Wael,

Flux doesnt work for me,it seems CCRL too has problems regarding hash size
and java memory usage with Flux but the engine works for them this way,I heard the author may fix the bug.

[fluxroot]

hi pal,
Flux works fine as a uci installed engine,I test Flux 0.9 and Flux 2.1
As for Mediocre,it works fine as a winboard installed program....

Hi Wael,

Flux doesnt work for me,it seems CCRL too has problems regarding hash size
and java memory usage with Flux but the engine works for them this way,I heard the author may fix the bug.

Precise memory allocation and deallocation in Java (and C# btw) is nearly impossible. With the help of the Eclipse profiler however I managed to calculate the hash allocation almost exactly for Flux.

So although the task manager on windows shows a greater value for java.exe, Flux really uses only the given number of mb for the hash tables.

Sorry but that's how Java works. However I'm currently rewriting Flux to C++. So memory management should be no problem anymore.

Cheers
Poky

[swami]

Precise memory allocation and deallocation in Java (and C# btw) is nearly impossible. With the help of the Eclipse profiler however I managed to calculate the hash allocation almost exactly for Flux.

So although the task manager on windows shows a greater value for java.exe, Flux really uses only the given number of mb for the hash tables.

Sorry but that's how Java works. However I'm currently rewriting Flux to C++. So memory management should be no problem anymore.

Cheers
Poky

Flux would be very interesting opponent for many engines out there.I hope you get the engine to work somehow as some of the java engines do work without freezing, whereas Flux doesn't and I'm missing the most interesting opponent for other competitors out there.