Record execution time in nios ii

Question

Hi,

I have a custom component in my qsys project and I want to record the processing time in the component by using 'clock()' in the nios C code.

The problem is whenever I add these lines:

'#include<time.h>',

'begin = clock()',

'end = clock()',

'time = (end-begin) / CLOCKS_PER_SEC'

to the code, the ELF downloading will fail.

Any suggestion why this happens and any alternative way I can record the execution time for my component?

Thanks!

altera_forum · Answer

I've never used clock() in NIOS, and I don't see why ELF downloading would fail because of the snippet you posted.

However, I would recommend reading this appnote:

In particular, the piece on the Performance Counter starting on page 11.

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