All _PS counters (for Xeon E5 Family) are not visibile in Linux Vtune 2013

All _PS counters (for Xeon E5 Family) are not visibile in Linux Vtune 2013

Imagen de GirishKumar B.

Hi,

I'm trying to get the % of LLC cpu time for hit and misses using the following for Xeon E5 family processor

Formulas:

% of cycles spent on memory access (LLC misses):

(MEM_LOAD_UOPS_MISC_RETIRED.LLC_MISS_PS * 210) / CPU_CLK_UNHALTED.THREAD

% of cycles spent on last level cache access (2nd level misses that hit in LLC):

((MEM_LOAD_RETIRED.L3_HIT_PS * 40) + (MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HIT_PS * 88) + (MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HITM_PS * 99)) / CPU_CLK_UNHALTED.THREAD

We are using Intel Vtune 2013 on Linux Ubuntu 12.04 to capture the General exploration with default settings for PMU events.

We dont find all the necessary (listed below) counters in the vtune GE analysis…

Here is the list of counters that are not visible…( Xeon e5 family)

MEM_LOAD_UOPS_MISC_RETIRED.LLC_MISS_PS

MEM_LOAD_RETIRED.L3_HIT_PS

MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HIT_PS

MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HITM_PS

 However, we find the non _PS versions of above counters are available.  So question is why _PS counter are not available in LINUX vtune 2013 ?  Can we use Non _PS counters for the above formulas ?   If not, how do we enable _PS counters in the vtune capture for general exploration (GE)?

 /Girish BK

 

 

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Imagen de Peter Wang (Intel)

I verified on E5500 machine, that is true:

MEM_LOAD_RETIRED.DTLB_MISS
MEM_LOAD_RETIRED.HIT_LFB
MEM_LOAD_RETIRED.L1D_HIT
MEM_LOAD_RETIRED.L2_HIT
MEM_LOAD_RETIRED.LLC_MISS
MEM_LOAD_RETIRED.LLC_UNSHARED_HIT
MEM_LOAD_RETIRED.OTHER_CORE_L2_HIT_HITM

But I think there is no any problem to use these events (without "_PS") in formulas for E5 machines.

Imagen de Vasudev J.

MEM_LOAD_UOPS_MISC_RETIRED.LLC_MISS (which is used in above formula to calculate % cycles on memory accesses) is also not there in the output counters..Is this same as MEM_LOAD_UOPS_RETIRED.LLC_MISS??

Thanks

~Vasudev Jakhar

Imagen de Peter Wang (Intel)

For Nehalem processors, use MEM_LOAD_RETIRED.LLC_MISS instead of MEM_LOAD_UOPS_MISC_RETIRED.LLC_MISS

For SandBridge processors, use MEM_LOAD_UOPS_MISC_RETIRED.LLC_MISS_PS

For IvyBridge processors, use MEM_LOAD_UOPS_RETIRED.LLC_MISS_PS

You need to check what exact LLC miss event name is in your system. Guideline author wrote the article when SandBridge processor is ready, so use SandyBridge event name in formula, as the example.

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