Search found 362 matches

by noobpwnftw
Sun Apr 01, 2018 11:33 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 141550

Re: 7-man Syzygy attempt.

Further perf digging shows kernel scheduling issues on bare hardware(tried 3.14, 4.15, referenced various guides, still no luck), falling back to ESXi + VM where everything works but running on less cores, I heard that it's the one and only system of this model(SYS-7089P-TR4T) ever built from the ha...
by noobpwnftw
Sat Mar 31, 2018 10:31 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 141550

Re: 7-man Syzygy attempt.

Perf shows a lot of extremely slow software interrupts, has something to do with spin locks in memory page management. I think there is no need to fix on the generator side, it must be a kernel problem, or it wouldn't not work so smoothly on virtual machines. I tried many different things and it wil...
by noobpwnftw
Sat Mar 31, 2018 2:45 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 141550

Re: 7-man Syzygy attempt.

vm.swappiness=0 kernel.nmi_watchdog=0 [b]kernel.numa_balancing=0[/b] kernel.sched_migration_cost_ns=5000000 kernel.sched_autogroup_enabled=0 Running without thread binding(-a) and having the above tweaks drops CPU sys% usage on top from 60% to 2%, thread binding has some negative impact on performa...
by noobpwnftw
Fri Mar 30, 2018 9:46 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 141550

Re: 7-man Syzygy attempt.

1. One machine has 384 cores, the generator won't build with MAX_THREADS=384 due to address space limitations of static variables, if I use -mcmodel=large I suspect that there will be performance issues with indirect memory access code being generated. I can look into dynamically allocating those a...
by noobpwnftw
Fri Mar 30, 2018 9:06 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 141550

Re: 7-man Syzygy attempt.

Status update: Now I rearranged memory of my 2 machines in order to build efficiently in parallel, one building 6+1 and another building 5+2. However there are a few glitches during the actual building work: 1. One machine has 384 cores, the generator won't build with MAX_THREADS=384 due to address ...
by noobpwnftw
Tue Mar 27, 2018 5:49 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-men Syzygy attempt
Replies: 588
Views: 141550

Re: 7-men Syzygy attempt

On a seperate note, any progress being made on the Syzygy 7 men? The mate in 500 or what it was did seem like it can work. :) My building process is ongoing, soon I will prepare another machine to build different sets in parallel. Ronald is already working on a file format to store large DTZ values...
by noobpwnftw
Sat Mar 24, 2018 7:01 pm
Forum: Computer Chess Club: General Topics
Topic: LCZero update
Replies: 266
Views: 57092

Re: LCZero update

Is the ceiling of 6x64 still quite far away after 3 days?
by noobpwnftw
Thu Mar 22, 2018 12:20 am
Forum: Computer Chess Club: General Topics
Topic: LCZero update
Replies: 266
Views: 57092

Re: LCZero update

I think there is also ongoing discussion on LZ about the filters, but changing it too much is effectively equivalent to another bootstrap from scratch and their user base do not like it so much. In chess the whole thing is relatively new and I do not understand how people are trying to refuse the f...
by noobpwnftw
Wed Mar 21, 2018 11:44 pm
Forum: Computer Chess Club: General Topics
Topic: LCZero update
Replies: 266
Views: 57092

Re: LCZero update

The network dimensions of 6 blocks, 64 filters were chosen arbitrarily at a value very similar to the net used by Leela Zero before the first bootstrap (which was 5 blocks, 64 filters). The choice was simply to use a relatively small network for fast improvement and to find and troubleshoot potenti...
by noobpwnftw
Wed Mar 21, 2018 11:19 pm
Forum: Computer Chess Club: General Topics
Topic: LCZero update
Replies: 266
Views: 57092

Re: LCZero update

You're missing something from the whole picture here, those ratings (that I did myself as they are taken from my tournament that I broadcast live) not only include the increase in network strenght, but also improvements made to the engine itself (like NN cache which gave a big speed impact, or time...