Profiling using Clock_getTicks()

Soumya Sardar

Intellectual 535 points

Hi,

I am running C66xx simulator on CCS v5 windows system.

I am trying to calculate the time taken by a particular part of a function.

1)Configured the CCS simulator as c6618 Device cycle approximate simulator

2) Put Clock_getTicks() before and after the function call which is running in a single core.

3) Got a different of 27 ticks between above two calls to Clock_getTicks().

My question is can I convert these 27 ticks to time by following calculation.

1) TMS320C66xx is 1.2 Ghz i.e. 1.2 * 10^9 ticks /second

2) So 27 ticks will take = 27/(1.2 * 10^9) seconds or 22.5 nano sec.

Please let me know if above assumption is correct or not?

Also I did try running Function profiler for the same. But the profiler setup window is not fiving any option or check boxes.

Regards

Soumya

over 13 years ago

0 Clement FR over 13 years ago

Genius 4750 points

You can use this code to get the number of cycles used by your application. It is very accurate.

I'll let you do the math to get the number in seconds though.

unsigned int t_start;
unsigned int t_stop;
unsigned int t_overhead;

TSCL=0;
t_start=TSCL;

% code you want to bench


t_stop = TSCL;
t_overhead=t_stop-t_start;

printf("Number of cycles = %d\n",t_overhead)

0 Soumya Sardar over 13 years ago in reply to Clement FR

Intellectual 535 points

In MY CCS build project, TSCL is coming as undefined.

Also needs to know after getting the number of cycles how to find the exact time taken.

0 one and zero over 13 years ago in reply to Soumya Sardar

TI__Mastermind 18256 points

... to be able to use TSCL you need to include the "c6x.h" header file ...

Kind regards,

one and zero

0 Johannes over 13 years ago in reply to one and zero

Mastermind 6240 points

Hi Soumya,

To obtain the time in seconds it's just do what you mentioned previously

time = num_of_cycles/frequency

But check what frequency you're using, sometimes the default frequency is not the highest operation frequency supported (you can see it in CCS, I just don't remember where ¬¬).

Regards

0 Johannes over 13 years ago in reply to Johannes

Mastermind 6240 points

Hi,

I just found another post (by one and zero too) that has an example of how to use TSCL and TSCH to determine the number of cycles that it takes to run a code.

http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/184564.aspx

Regards

Processors

Processors forum

Profiling using Clock_getTicks()