CCC has serious hardware update!

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Jouni
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Re: CCC has serious hardware update!

Post by Jouni » Sat Jan 02, 2021 11:22 am

Now SF classic with 232 cores has much lower nps than Komodo 128 cores. Something is wrong now :!: :?: .
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Dann Corbit
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Re: CCC has serious hardware update!

Post by Dann Corbit » Sat Jan 02, 2021 4:05 pm

Jouni wrote:
Sat Jan 02, 2021 11:22 am
Now SF classic with 232 cores has much lower nps than Komodo 128 cores. Something is wrong now :!: :?: .
maybe Komodo scales better
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mwyoung
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Re: CCC has serious hardware update!

Post by mwyoung » Sat Jan 02, 2021 4:25 pm

Dann Corbit wrote:
Sat Jan 02, 2021 4:05 pm
Jouni wrote:
Sat Jan 02, 2021 11:22 am
Now SF classic with 232 cores has much lower nps than Komodo 128 cores. Something is wrong now :!: :?: .
maybe Komodo scales better
Again you can only split the search so many times effectively. And you CAN NOT measure speed by NPS. To know the real speed difference when using different amounts of threads and cores . YOU MUST USE TIME TO DEPTH.
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Nay Lin Tun
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Re: CCC has serious hardware update!

Post by Nay Lin Tun » Sat Jan 02, 2021 4:29 pm

Jouni wrote:
Sat Jan 02, 2021 11:22 am
Now SF classic with 232 cores has much lower nps than Komodo 128 cores. Something is wrong now :!: :?: .
It looks like you dont understand actual physical cores vs hyperthreads.( 2x Threads=1 core). 232÷2= 116 cores

Stockfish is not running on 232 cores, they dont have 232 cores. Komodo is running on 128 physical cores.

mwyoung
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Re: CCC has serious hardware update!

Post by mwyoung » Sat Jan 02, 2021 4:35 pm

Nay Lin Tun wrote:
Sat Jan 02, 2021 4:29 pm
Jouni wrote:
Sat Jan 02, 2021 11:22 am
Now SF classic with 232 cores has much lower nps than Komodo 128 cores. Something is wrong now :!: :?: .
It looks like you dont understand actual physical cores vs hyperthreads.( 2x Threads=1 core). 232÷2= 116 cores

Stockfish is not running on 232 cores, they dont have 232 cores. Komodo is running on 128 physical cores.
Correct. But the splitting of the search to 232 threads is real. It acts just like a real core but only running at 1/2 speed.
Most likely Stockfish is being hurt by splitting the search 232 times. But to know by how much you would need to measure the performance with time to depth.
Last edited by mwyoung on Sat Jan 02, 2021 4:37 pm, edited 1 time in total.
"The worst thing that can happen to a forum is a running wild attacking moderator(HGM) who is not corrected by the community." - Ed Schröder
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marsell
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Re: CCC has serious hardware update!

Post by marsell » Sat Jan 02, 2021 4:35 pm

Looking at the info, here's what I find:

CPUs: 2 x AMD EPYC 7H12
GPU: 2x A100 (40 GB GPU memory)
Cores: 256 cores (128 physical)
RAM: 512GB DIMM DDR4 2933 MHz (0.3 ns)
SSD: 2x Micron 5210 MTFD (2TB) in RAID1
OS: CentOS 8

Vinvin
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Re: CCC has serious hardware update!

Post by Vinvin » Sat Jan 02, 2021 5:08 pm

marsell wrote:
Sat Jan 02, 2021 4:35 pm
Looking at the info, here's what I find:

CPUs: 2 x AMD EPYC 7H12
GPU: 2x A100 (40 GB GPU memory)
Cores: 256 cores (128 physical)
RAM: 512GB DIMM DDR4 2933 MHz (0.3 ns)
SSD: 2x Micron 5210 MTFD (2TB) in RAID1
OS: CentOS 8
Is it the same as the first message of this thread ?

Jouni
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Re: CCC has serious hardware update!

Post by Jouni » Wed Jan 13, 2021 3:56 pm

As I said SF has issues with that hardware https://github.com/official-stockfish/S ... /pull/3288. Maybe it's better to use 128 real cores?
Jouni

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