Counting MFENCE events with performance counters

[Tim_M_1]

Hi All,

I'm wondering if there is a performance counter for retired MFENCE instructions or perhaps another counter that could provide something similar. I've googled a bit, and it looks like AMD has such a counter but I've seen nothing for Intel. Ditto on lock prefix instructions...I haven't seen anything for those either.

Thanks for the help!

Tim

[Roman_D_Intel]

On Intel you have MEM_UOPS_RETIRED.LOCK_LOADS/MEM_UOPS_RETIRED.LOCK_STORES  events. However they work best with disabled Hyper-Threading.

Roman

[Tim_M_1]

Thanks Roman, what about for memory fences?

[Roman_D_Intel]

I am not aware of FENCE events.

Roman