CCC has serious hardware update!

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Jouni
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Re: CCC has serious hardware update!

Post by Jouni »

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 »

Jouni wrote: ↑Sat Jan 02, 2021 12:22 pm 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 »

Dann Corbit wrote: ↑Sat Jan 02, 2021 5:05 pm
Jouni wrote: ↑Sat Jan 02, 2021 12:22 pm 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 »

Jouni wrote: ↑Sat Jan 02, 2021 12:22 pm 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.
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mwyoung
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Re: CCC has serious hardware update!

Post by mwyoung »

Nay Lin Tun wrote: ↑Sat Jan 02, 2021 5:29 pm
Jouni wrote: ↑Sat Jan 02, 2021 12:22 pm 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 5:37 pm, edited 1 time in total.
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marsell
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Re: CCC has serious hardware update!

Post by marsell »

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
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Vinvin
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Re: CCC has serious hardware update!

Post by Vinvin »

marsell wrote: ↑Sat Jan 02, 2021 5:35 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 ?
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Jouni
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Re: CCC has serious hardware update!

Post by Jouni »

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?
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Jouni
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Re: CCC has serious hardware update!

Post by Jouni »

Now SF classic has nice speed: 350 Mnps in middle game. Way to go!
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