C674x Cycle Accurate Simulator setup

E2E_display_name_Mike

I'm trying to use the C674x Cycle Accurate Simulator to profile/benchmark our code, but the simulator is not correctly reflecting the cycle counts I get on target H/W.

I'm using a simple routine from DSP C6000 workshop to test this. It calculates the dot product of 2 input arrays. I locate the input arrays into different sections in memory and the results are as follows:

Location in input arrays	target H/W Cycle counts	Simulator Cycle counts
L2	385	137
L3 (not cached)	8,452	137

Cycle counts is measured using breakpoints and enable+view clock from the Profile menu option.

I must be missing something in the setup? I compile/run the same .pjt. The only change (other than selecting the target when CCS launches) is in the .tcf file where I toggle the RTDX mode between JTAG and simulator.

thanks,

Mike

over 13 years ago

0 E2E_display_name_Mike over 13 years ago

Expert 1700 points

Hi,

I am still waiting for someone from TI to help me with this issue. The basic issue is setting up my simulator to accurately reflect the cycle execution on my DSP - C6747.

Here is the source code I am using from a recent C6000 workshop:

/* Prototype */
int dotp(short *m, short *n, int count);

/* Include Files */
#include "data.h"

/* Definitions */
#define COUNT   256

/* Declarations */
short a[COUNT] = {A_ARRAY};
short x[COUNT] = {X_ARRAY};
int y = 0;

/* Main Code */
main()
{
   y = dotp(a, x, COUNT);
}

int dotp(short *m, short *n, int count)
{
   int i;
    int sum = 0;

   for (i=0; i < count; i++)
   {
        sum = sum + m[i] * n[i];
   }

   return(sum);
}

In the lab, the dotp() function will take 81 cycles with the sim64P simulator. I can't get that result when I use the C674x Cycle Accurate simulator. Please help!

thanks.

Mike

0 Sheshadri Chakravarthy over 13 years ago in reply to E2E_display_name_Mike

TI__Intellectual 1420 points

Hi Mike,

C674x CPU cycle accurate configuration does not model Cache, hence you are not seeing matching numbers w/ hw. You can instead use

"C6747 Device Cycle Accurate simulator" configuration. This is cycle accurate simulator that provides close to h/w numbers but performancewise will be slower compared to CPU only simulator.

regards,

Sheshadri

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C674x Cycle Accurate Simulator setup