main line wrote:But we saw this here:
https://icga.leidenuniv.nl/?page_id=1990
All engines are equal
In 5th round 2 years ago Jonny-2400 cores won Komodo-12 cores
https://icga.leidenuniv.nl/?page_id=1260
I am sure in one thing:
Texel with 2400 cores in such time control ~1hour45min/game + increment 15sec/move is unbeatable because with huge number of cores and in long time control engine will find strongest ("God's") move in any position.
No difference between 2000 cores and 10.000 cores or 100.000 cores because for strongest move in any position with nowadays strogest engines need probably 2400 cores 2-5 minutes / move.
I do not think anything significant can be discovered by a tiny contest like Leiden.
I think that Texel's excellent scale power might be worth more than the estimates, but there is no way to tell unless you play the games.
For extreme scaling, Ipman's site is really interesting.
This refers to a slightly older version of Texel (which was a big improvement from the previous version):
http://www.ipmanchess.yolasite.com/test ... hreads.php
Texel 1.06a48 512cores Numatest 3 from Peter Osterlund
He was so kind to make a new release Texel 1.06a49 with source and can put the link here:
https://dl.dropboxusercontent.com/u/896 ... l106a49.7z
setoption name hash value 1024
setoption name threads value 72
go depth 22
8cores
info nodes 523751942 nps 8781890 time 59640
16cores
info nodes 465912687 nps 16656990 time 27971
18cores=1cpu
info nodes 700218378 nps 18361567 time 38135
22cores
info nodes 474150640 nps 20808858 time 22786
32cores
info nodes 915012019 nps 31049985 time 29469
36cores =2cpu's
info nodes 789579580 nps 35225499 time 22415
44cores
info nodes 1054602231 nps 42282183 time 24942
54cores=3cpu's
info nodes 960015462 nps 48781273 time 19680
64cores
info nodes 1113647063 nps 56077700 time 19859
72cores
info nodes 987339559 nps 62092922 time 15901
I did also used go depth 24 for last two ,because it was to quickly finished with go depth 22
64cores - go depth 24
info nodes 4634818942 nps 63032176 time 73531
72cores - go depth 24
info nodes 6291455339 nps 69499644 time 90525
Compare it to this version and yow will see it is about 5x better on 72 cores that the previous:
Texel had a first try with Numa..but also here no gain after 2cpu's..even a slowdown..also SMP can be better!
Texel 1.06a48 512cores Numa
setoption name threads value 8
go depth 22
8cores
info nodes 535900101 nps 7208965 time 74338
16cores
info nodes 666496072 nps 13589203 time 49046
18cores
info nodes 467481214 nps 15624894 time 29919
22cores
info nodes 719367492 nps 17628099 time 40808
32cores
info nodes 906991000 nps 21920702 time 41376
36cores
info nodes 924095974 nps 22428969 time 41201
44cores
info nodes 958960416 nps 15240947 time 62920
54cores
info nodes 1357458581 nps 12538295 time 108265
64cores
info nodes 1145138765 nps 14235759 time 80441
72cores
info nodes 1056645969 nps 14224983 time 74281