Kingsrow - databases

Discussion about development of draughts in the time of computer and Internet.
Rein Halbersma
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Re: Kingsrow - databases

Post by Rein Halbersma » Tue Jan 19, 2021 15:22

BertTuyt wrote:
Tue Jan 19, 2021 15:15
Rein, I assume that at least from a memory point of view the 9p would be doable-ish.
My guestimate is that 256 GByte would be sufficient, and at least the Threadripper could address this.
Also with Threadripper mother boards with 8 DIMM slots and 32 GByte Dimm seems not to be impossible.
Last but not least the costs for 256 GByte would be between 1000 - 1200 euro.

Certainly expensive, but not totally out of reach (as this is also my wish next PC system, 32 cores :D)

Bert
As Ed said, 9 pieces are entirely doable. It's ~13 core years. If you have 64 cores and 256Gb, it's 2-3 months. Although you would need pretty good slicing (not just leading rank) or else you need 384 Gb AFAICS.

Rein Halbersma
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Re: Kingsrow - databases

Post by Rein Halbersma » Tue Jan 19, 2021 15:30

Ok, I did some more calculations. With a 64-core Threadripper (~$4K) and leading squares indexing, you can do 9 pieces in 90 days and 192 Gb of RAM. You can also do 10 pieces in 2 years and 640 Gb of RAM. All assuming that a threadripper core is pound for pound the equivalent of a Xeon core. If that is a factor 2-4 you're back to square one.

Krzysztof Grzelak
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Re: Kingsrow - databases

Post by Krzysztof Grzelak » Tue Jan 19, 2021 17:34

Rein I have a question. You know computers very well. Does it exist and have you encountered it to connect several computers together so that the computing power is greater.

Rein Halbersma
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Re: Kingsrow - databases

Post by Rein Halbersma » Tue Jan 19, 2021 20:09

BertTuyt wrote:
Tue Jan 19, 2021 15:15
Rein, I assume that at least from a memory point of view the 9p would be doable-ish.
My guestimate is that 256 GByte would be sufficient, and at least the Threadripper could address this.
Also with Threadripper mother boards with 8 DIMM slots and 32 GByte Dimm seems not to be impossible.
Last but not least the costs for 256 GByte would be between 1000 - 1200 euro.

Certainly expensive, but not totally out of reach (as this is also my wish next PC system, 32 cores :D)

Bert
If you're going down the AMD path, the translation table is roughly this:
Threadripper -> i9 XE
Threadripper Pro -> Xeon W-series [this segment is where Ed's machine is now, and where my old Xeon E5 sat]
Epyc -> scalable Xeon (platinum) [two 8-socket 24 core machines solved 7 piece chess dbs, at $90K each]

The Zen 3 Epyc will become available in Q1 2021, and supports up to 2 sockets of 64 cores each. The older Zen 2 64 core version went at around $7K per processor, but AMD is lowering prices so you might get a 128 core machine for ~10K (no RAM though yet). With such a machine, you could build the 10 pc dbs in a year. If you wait one more generation of processors, it might be for half that amount of money.

Krzysztof Grzelak
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Re: Kingsrow - databases

Post by Krzysztof Grzelak » Mon Mar 08, 2021 21:40

Hi Ed.

Can you write exactly how much all items in the database are 4x4.

Ed Gilbert
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Re: Kingsrow - databases

Post by Ed Gilbert » Tue Mar 09, 2021 13:01

Krzysztof Grzelak wrote:
Mon Mar 08, 2021 21:40
Can you write exactly how much all items in the database are 4x4.
You can see the sizes of the files using Windows Explorer. The filenames have the total number of pieces and the number of pieces of each type. For example db8-4103 has 8 pieces, 4 black men, 1 black king, 0 white men, and 3 white kings.

Krzysztof Grzelak
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Re: Kingsrow - databases

Post by Krzysztof Grzelak » Tue Mar 09, 2021 16:25

You misunderstand me. How much position the entire base has 4x4.

Ed Gilbert
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Re: Kingsrow - databases

Post by Ed Gilbert » Tue Mar 09, 2021 18:11


Krzysztof Grzelak
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Re: Kingsrow - databases

Post by Krzysztof Grzelak » Tue Mar 09, 2021 19:10

Thank you Ed.

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