Search found 4544 matches

by syzygy
Tue May 25, 2021 8:44 pm
Forum: Computer Chess Club: General Topics
Topic: is this an issue with missing DTZ ?
Replies: 12
Views: 3798

Re: is this an issue with missing DTZ ?

Do you really have the same problem again? Lose, lose, draw, lose, lose with MultiPV = 5 in the same position? hello syzygy, thx for your response :-) ...no, in the pos from above SF shows correctly Kc5 as the only drawing move and shows -153 or so for all other moves ProbeLimit was set on default ...
by syzygy
Thu May 06, 2021 11:58 pm
Forum: Computer Chess Club: General Topics
Topic: is this an issue with missing DTZ ?
Replies: 12
Views: 3798

Re: is this an issue with missing DTZ ?

Do you really have the same problem again? Lose, lose, draw, lose, lose with MultiPV = 5 in the same position?
by syzygy
Thu May 06, 2021 11:46 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Nalimov errors
Replies: 16
Views: 6257

Re: Nalimov errors

That is a good point, and one I had overlooked. Yes, block size is an optional parameter to DATACOMP.EXE. Importantly the default value is 64k, not the 8k which was the value, if I remember correctly, that was used to compress for the official release. Bob Hyatt has posted multiple times about his ...
by syzygy
Tue May 04, 2021 6:37 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Nalimov errors
Replies: 16
Views: 6257

Re: Nalimov errors

Hmm. The potential of bit-rot of the Nalimov generator is curious (i.e. ranging from unexpected to mildly alarming). Given that Jonathan said he ran datacomp, and that his md5sum command is running against an .emd file, my suspicion is that datacomp has not survived the transition from 32-bit to 64...
by syzygy
Mon May 03, 2021 12:11 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Nalimov errors
Replies: 16
Views: 6257

Re: Nalimov errors

So there is a pragma pack in the Nalimov code to ensure packing on a stated boundary so that the change from 32 to 64 bit addressing (or other packing rule such as one byte boundaries for space saving) had no effect? I did not see it in my copy of the code. Without ever having looked at the source ...
by syzygy
Sat May 01, 2021 7:13 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Nalimov errors
Replies: 16
Views: 6257

Re: Nalimov errors

Great, thank you! Yes mine are larger. When I decompress the downloaded files, they are the same size as the generated files. I haven't checked the checksums, yet, but that looks like the answer. It certainly won't have anything to do with modern compilers "tending to pack on wider block sizes". Ho...
by syzygy
Sat May 01, 2021 7:04 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)
Replies: 53
Views: 19555

Re: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)

It is probably advisable to Limit the number of threads in this case to 16 or 32 at most. Why would you want to limit a CPU with 64 physical cores to 16 or 32 threads? For hash clearing purpose only, not for search. Clearing fi 16 GB with 16 threads should be sufficiently fast. But the Threads vari...
by syzygy
Sat May 01, 2021 4:59 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)
Replies: 53
Views: 19555

Re: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)

Joerg Oster wrote:
Mon Apr 26, 2021 8:16 pm
It is probably advisable to Limit the number of threads in this case to 16 or 32 at most.
Why would you want to limit a CPU with 64 physical cores to 16 or 32 threads?
by syzygy
Mon Apr 26, 2021 3:15 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)
Replies: 53
Views: 19555

Re: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)

Ronald does this mean that in each group I have 32 physical and 32 logical threads? Cfish 110421 64 AVX2 NUMA by Syzygy based on Stockfish info string NUMA enabled. setoption name Threads value 64 go depth 10 info string Binding thread 0 to node 0 in group 0. info string Binding thread 1 to node 0 ...
by syzygy
Sun Apr 25, 2021 8:10 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)
Replies: 53
Views: 19555

Re: New AMD Ryzen™ Threadripper™ PRO 3995WX (Windows and Multithreading Problem)

Joost Buijs wrote:
Sun Apr 25, 2021 5:42 pm
that's why I'm waiting for the Zen-3 Threadripper, when it arrives I will ditch the 3970X.
I'm afraid Zen-3 Threadripper will not happen.
(Hmm, apparently there are leaks about an August 2021 release date, but what are the chances that the chips will actually be available...)