workstation xeon gold

naffrancois · June 21, 2018, 17:53

Hello,

I want to build a workstation and it has to be a Dell. What is the optimal cpu choice for an in house mpi solver ? I am looking for a good compromise price/parallel performance, very few single threaded applications. What performance inrease may I expect between gold 6138 and gold 6148 ? My second question is about memory, xeon gold cpus offer 6 memory channels if I am right but dell does not propose many combinations, is 12*8 go ok for a dual xeon platform ?

Thanks for your help

flotus1 · June 22, 2018, 04:37

You are looking at an all-core turbo frequency which is ~15% higher. There are no other differences between these CPUs. Best case scenario: your codes run 15% faster. This would require that your codes are not bandwidth-limited, otherwise the difference will be smaller.
12 DIMMs are the optimal memory population for dual-socket Skylake-SP. How much memory you need -i.e. capacity per DIMM- is up to you.

naffrancois · June 22, 2018, 04:54

Thank you for your reply

I think I will opt for the 6148. Our code showed almost linear speed up up to 64c on a dual epyc 7501, is it reasonable to think that on a dual gold with 40c I will get a similar trend despite less memory channels ?

flotus1 · June 22, 2018, 05:02

It is possible if they use the same instruction set. Since your code seems to be compute-bound, you might benefit from AVX(512) which has a much higher throughput on Skylake-SP processors. In turn, it would require more data from RAM in the same amount of time...
Really hard to tell without analyzing your specific code.

naffrancois · June 23, 2018, 15:05

Thank you for the explanations, I will probably go for it and give a feedback vs the epyc : )

June 21, 2018, 17:53	workstation xeon gold	#1
naffrancois Senior Member Join Date: Oct 2011 Posts: 242 Rep Power: 16	Hello, I want to build a workstation and it has to be a Dell. What is the optimal cpu choice for an in house mpi solver ? I am looking for a good compromise price/parallel performance, very few single threaded applications. What performance inrease may I expect between gold 6138 and gold 6148 ? My second question is about memory, xeon gold cpus offer 6 memory channels if I am right but dell does not propose many combinations, is 12*8 go ok for a dual xeon platform ? Thanks for your help

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June 22, 2018, 04:37		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,400 Rep Power: 47	You are looking at an all-core turbo frequency which is ~15% higher. There are no other differences between these CPUs. Best case scenario: your codes run 15% faster. This would require that your codes are not bandwidth-limited, otherwise the difference will be smaller. 12 DIMMs are the optimal memory population for dual-socket Skylake-SP. How much memory you need -i.e. capacity per DIMM- is up to you.

June 22, 2018, 04:54		#3
naffrancois Senior Member Join Date: Oct 2011 Posts: 242 Rep Power: 16	Thank you for your reply I think I will opt for the 6148. Our code showed almost linear speed up up to 64c on a dual epyc 7501, is it reasonable to think that on a dual gold with 40c I will get a similar trend despite less memory channels ?

June 22, 2018, 05:02		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,400 Rep Power: 47	It is possible if they use the same instruction set. Since your code seems to be compute-bound, you might benefit from AVX(512) which has a much higher throughput on Skylake-SP processors. In turn, it would require more data from RAM in the same amount of time... Really hard to tell without analyzing your specific code.

June 23, 2018, 15:05		#5
naffrancois Senior Member Join Date: Oct 2011 Posts: 242 Rep Power: 16	Thank you for the explanations, I will probably go for it and give a feedback vs the epyc : )