Re: unable to get load latency info

[Harald Servat <harald.servat@bsc.es>]

On 28/02/14 14:42, Andi Kleen wrote:
> Muthusamy <muthu9283@yahoo.com> writes:
>> perf version 3.12.11
>> [root@rafa tmp]# ./perf stat -e r100b pwd  ### (I have tried with
>> other data intensive programs too)
>
> I don't think r100b is a valid event on Westmere. Not sure where you got
> that from. As others pointed out you need to use perf mem record/report
> with sampling (but note that it reports use-latency, not load-latency)
>
> -Andi
>

Andi,

   what do you mean by use-latency here? I understood that PEBS was able 
to report the number of core cycles that the load took to from some part 
of the memory hierarchy until it reached the CPU.

Thank you.

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