Profiling on TMS570LS31HDK

Sridhar Artham

Intellectual 330 points

Hi,

I want to measure CPU cycles for a sub routine.

I am using routines provided in sys_pmu.asm which has come as a part of installation.

I am calling the functions in the following manner:

_pmuInit_();
_pmuEnableCountersGlobal_();
_pmuSetCountEvent_(pmuCOUNTER0, PMU_CYCLE_COUNT); // PMU_INST_ARCH_EXECUTED

_pmuResetCounters_();
_pmuStartCounters_(pmuCOUNTER0);
aCycleCountStart = _pmuGetEventCount_(pmuCOUNTER0);

/*****************************************************************/

CODE TO BE PROFILED

/*****************************************************************/

_pmuStopCounters_(pmuCOUNTER0);
aCycleCountEnd = _pmuGetEventCount_(pmuCOUNTER0);
aTotalCycles = aCycleCountEnd - aCycleCountStart;

I am not able to get the cycles. I am getting 0 values for cycle counts.

What I am doing wrong in the above implementation?

Thanks and Regards

sridhar artham

over 9 years ago

0 KARTHIKEYAN RAJAMANICKAM over 9 years ago

TI__Genius 11645 points

Pls use the below which is used to count CPU cycles rather than specific events.

_pmuInit_();
_pmuResetCounters_();
_pmuStartCounters_(pmuCYCLE_COUNTER);

//CODE TO BE BENCHMARKED
...
...
...

_pmuStopCounters_(pmuCYCLE_COUNTER);
varTotalCycleCount = _pmuGetCycleCount_();

Hope that helps.

0 Sridhar Artham over 9 years ago in reply to KARTHIKEYAN RAJAMANICKAM

Intellectual 330 points

Thank you Karthikeyan, it is working.

0 Sridhar Artham over 9 years ago in reply to Sridhar Artham

Intellectual 330 points

I have written a small stub, I am getting 2005 cycles. I don't think that is correct.

_pmuInit_();
_pmuResetCounters_();
_pmuStartCounters_(pmuCYCLE_COUNTER);

//CODE TO BE BENCHMARKED
function2()

_pmuStopCounters_(pmuCYCLE_COUNTER);
varTotalCycleCount = _pmuGetCycleCount_();

void function2()
{
int i,j,loop_count=0;
i = 10;
j = 20;
i = i + j;

for(loop_count = 0;loop_count<100;loop_count++)
{
i = i+j;

}

}

varTotalCycleCount = 2005, is that correct value for the above stub?

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Profiling on TMS570LS31HDK