A little help with K 9.42 64 bit preformance on duel socket

[Tdunbug]

Hi I have a duel socket (16 core) intel 2660 v0 2.2 ghz machine with 32gb of ram on SSD. I also have a i7 4930k with 32gb or ram on SSD. What is curious to me is that I get far better node performance( average 12k/sec) on the i7 4930k then on the duel cpu(9k/sec). This is with tablebase hits turned off.

Does anyone have any suggestions as to why I have such poor performance on my duel socket machine? I thought that two 8 cores @ 2.2 would naturally out perform 1 6 core @ 3.4ghz.

[AndrewM]

Hey,

In my experience Komodo takes a bit of warm up time on NUMA machines. Which worsens with more nodes.

Try running Komodo for a while or running a couple of games before doing the benchmark, you might notice the speed up happening gradually.

Once it is at full speed, it stays so until you unload the engine.

Hope this helps,
Andrew

[jdart]

It is not very surprising. There are some inefficiencies running a chess engine in a dual socket configuration because not all memory access is local to one socket.

Plus the 2660 machine probably has slower RAM and is on an older microarchitecture (I assume this is the original 2660 not the v2-v4 series).

In fact if you look up the Passmark score (http://www.cpubenchmark.net/) the i7-4930k scores higher.

--Jon

[Werewolf]

I have 3 dual xeons and have not had your problem. Your 16 core should definitely be faster than your 6 core, despite the clock difference.

Please could you give your exact xeon model v1, v2, v3 etc?

thanks.

[Tdunbug]

http://ark.intel.com/products/64584/Int ... -Intel-QPI

I have two of those plus

Samsung EVO 850 SSD 250
Crucial 32GB DDR3-1600 ECC UDIMM
Motherboard Supermicro x9DRL-IF B

[zullil]

It is not very surprising. There are some inefficiencies running a chess engine in a dual socket configuration because not all memory access is local to one socket.

--Jon

Yeah, like the thread title says. The sockets are dueling.

Sorry.