AdaChess v.30 released

[alessandro]

1900 Elo? That would be a huge jump!

BTW, I can confirm Gabor's observations re: extra-core usage. On this 12-core Xeon the new version does take up two cores: the CPU usage is reported as 17% by Task Manager, whereas it should be 8%.

Only recently I introduced the 2017 version to the 40/4 list and it doesn't exhibit this behavior. According to Process Hacker, the process runs two threads, only one of which takes CPU time of between 8 and 9%. The other one's CPU usage is apparently negligible. Now this new version has each of its two threads consuming 8%+ constantly during search -- that's two cores occupied by a non-SMP program.

I view this as a serious bug that should be addressed ASAP.

Thanks for your feedback. I will look into the detail to find the problem and release a fixed version ASAP.

[RubiChess]

I don't know if this is possible in ADA and I don't know your code but usually a thread that waits for another thread in some loop should do a
sleep <some milliseconds>
inside the loop.

Maybe that helps.

Andreas

[alessandro]

Someone wrote me that AdaChess was not downloadable, I believe due to a bug into the download manager behind my site.
AdaChess is again available for download.

[alessandro]

I fixed the CPU usage bug. The version named 3.1 is available for download on http://www.adachess.com/
I wish to thanks you guys for your feedback. Communities always helps to improve our work.
I hope you enjoy AdaChess!

[Gabor Szots]

I fixed the CPU usage bug. The version named 3.1 is available for download on http://www.adachess.com/
I wish to thanks you guys for your feedback. Communities always helps to improve our work.
I hope you enjoy AdaChess!

That was quick! Thank you, Alessandro.

[Gabor Szots]

Oh, a minor 'bug': It still says its version is 3.0.

[tpoppins]

Confirmed: the extra-core problem is gone. v3.1 now behaves in that respect properly, like earlier versions: one main thread using a full core and a secondary thread that comes and goes and briefly uses something like 1/10th of the main thread's CPU time.

Bravo, Alessandro!

Care to share how you managed to fix it, in layman's terms? (I know next to nothing about Ada).

[Jamal Bubker]

Hi Alessandro !

Thanks for releasing your chess engine

[alessandro]

Care to share how you managed to fix it, in layman's terms? (I know next to nothing about Ada).

The problem itself is still a bit unclear to me: I used the Yield function from the standard library to sleep a thread. Why the thread was still awake? I need to look further to answer this question in details.
To solve the problem and release the solved version ASAP I have just changed the way to put the clock asleep in another way

[alessandro]

Hi Alessandro !

Thanks for releasing your chess engine

My pleasure. And thanks you too, to play with it!