Re: perf events (node-loads, node-load-misses, ...)

[Taeung Song <treeze.taeung@gmail.com>]

Hi Hyojong,

On 05/02/2017 02:03 AM, Hyojong Kim wrote:
> Hello,
>
> My processor has several hardware cache events, of which I am
> interested in node-loads, node-load-misses, node-stores,
> node-store-misses. I think it is kind of obvious that node-loads and
> node-stores represent references to local memory (memory physically
> attached to a processor package). However, I have no clue as to what
> the rest represents. I have some theory that "node-load-misses"
> represent the number of misses in local memory, or the number of
> accesses to disk. Based on the profiled results I have
> (page-faults:16M << node-load-misses+node-store-misses:748M), however,
> this cannot be the raw number of disk accesses. Maybe some kind of
> piggybacking mechanism (by some MSHR kind of structure in memory?)
> could be the reason behind this discrepancy, but no clue. If anyone
> has some idea on this, please share it with me.
>
> I appreciate your help in advance!
>
> Sincerely,
> - Hyojong

Could I detailedly know your test case ?
(e.g options of perf-record, perf.data, test environment, etc)

Of course, you used the perf events (i.e. node-load-misses, etc),
but if you show the correct command and options when using perf-record
and share a link of the perf.data as the profiled results,
it'd be more easy to investigate this situation.


Thanks,
Taeung