help

[Madhavan Srinivasan]

On Wednesday 17 October 2018 02:03 PM, Lorenzo Chelini wrote:
> Hi All,
>
> I am a PhD at IBM Zurich. I am playing around with the new POWER9 servers.
> I am interested in plotting a roofline model for a given application, but I
> need
> to measure the traffic to and from the memory.
> Ideally, what I would like to measure is the traffic at the memory
> controller level.

Yes, you can get that data using Nest IMC counters. And perf
has support to expose these counters. Here is a usage example

$ perf stat -e nest_mcs01_imc/PM_MCS01_128B_RD_DISP_PORT01/  -I 1000 
--per-socket

Above command gets you all the Read traffic via specific memory 
controller/port.
Option "-I" reads the counter every sec and "--per-socket" presents the 
data socket wise.

"perf list nest_mcs" command will list all supportted events for memory 
controller.


Maddy

>
> Do you know if this is possible using perf? If yes, which performance
> counters I should
> query to have an estimate on the memory traffic?
>
> Thanks for your time.
> Looking forward to hearing from you.
> Best regards,
> Lorenzo Chelini
>