Finding Intersocket QPI

Finding Intersocket QPI

Ritratto di Amal P
Amal P
Mer, 19/01/2011 - 01:09

Hi,

I'm unable to find any help for vtbwrun which will help in getting the QPI details. I want to check the Intersocket QPI of my application on Nehalem. When I run the vtbwrun -r I can get the "# IOH reads" in the QPI information. But what I want to find is the use of QPI links between CPU sockets(Intersocket QPI). How can I find this information using Intel performance tuning utility?

Below is the information that I can get using the Intel PMU. But I need the details like the QPI utilization between processors.

--- Intersocket QPI Utilization ---||--- Intersocket QPI Utilization ---
---------------------------------------||---------------------------------------
--- # Rd IOH: 1059345.0 ---||--- # Rd IOH: 2725103.0 ---
--- # Wr IOH: 404078.0 ---||--- # Wr IOH: 912623.0 ---

Thanks!
Amal

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Ritratto di Dmitry Ryabtsev (Intel)
Dmitry Ryabtsev (Intel)
Mer, 19/01/2011 - 03:17

If you run vtbwrun without -r you'll seeintersocket QPI utilization in MB/s, like this:

---------------------------------------||---------------------------------------

--- Intersocket QPI Utilization ---||--- Intersocket QPI Utilization ---

---------------------------------------||---------------------------------------

--- Reads (MB/s): 4176.22 ---||--- Reads (MB/s): 0.00 ---

--- Writes(MB/s): 1385.60 ---||--- Writes(MB/s): 0.00 ---

Is it what you want?

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Ritratto di Amal P
Amal P
Mer, 19/01/2011 - 03:32

Thank you Dmitry. Is it possible to get IOH and this QPI information together?

Thanks!
Amal

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Ritratto di Dmitry Ryabtsev (Intel)
Dmitry Ryabtsev (Intel)
Mer, 19/01/2011 - 04:06

No currently it is not possible

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