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2016 Xeons processors, Intel Omni-Path interconnect and Infiniband direct connect

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Old   December 8, 2015, 11:09
Default 2016 Xeons processors, Intel Omni-Path interconnect and Infiniband direct connect
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Guillaume Jolly
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Hi
1/ Does anyone know when the 2016 xeon 2U processors will become available?
2/ Does anyone know when the Intel Omni-Path Fabric will become available?
3/I read an article a while ago where Mellanox said they had a clear technological lead over Intel. I wondering if that's possible technically to have an advantage over Intel because they already do the interconnect between processors. Is there such a huge gap in the technology required to get 8 processors working together on the same motherboard and 5000 in a cluster?
4/Is it still possible with the latest infiniband technology to have a direct connect between two infiniband cards i.e; with no switch?
5/Is direct connect possible with Omni-Path?

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Old   December 22, 2015, 07:52
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Kim Bindesbøll Andersen
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Quote:
Originally Posted by trampoCFD View Post
4/Is it still possible with the latest infiniband technology to have a direct connect between two infiniband cards i.e; with no switch?
Two years ago it was.
My cluster is 2 nodes of Dual Xeon E5-2667 v2, connected directly using Infiniband and no switch.
I dont know if any changes to Infiniband has occured during the last two years.

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Old   December 23, 2015, 05:31
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And does you cluster scale well on small simulation, around the 2M cells mark?

I noticed in my previous company that the direct connect was probably nowhere near as good as it should have been. I wonder if direct connect increases the latency somehow.
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Old   January 4, 2016, 02:17
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Kim Bindesbøll Andersen
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See this post:
http://www.cfd-online.com/Forums/har...l#post452000#8

Later scaling tests I have done, see attached picture.
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File Type: png Scaling2.PNG (61.1 KB, 78 views)
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Old   January 8, 2016, 08:18
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Hi Kim, thanks for that, so the infiniband models were run with direct connect : just a card in each node, with an infiniband cable and no switch, correct?
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Old   January 11, 2016, 01:29
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Kim Bindesbøll Andersen
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Yes, correct: Only 2 nodes and Infiniband card in each and no switch. Of cause you can only do this with 2 nodes.
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infiniband, intel, mellanox, omni-path, xeon

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