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jjackbauer7
jjackbauer7
Associate III
May 20, 2013
Question

Measuring MIPS of a DSP function using systick

  • May 20, 2013
  • 1 reply
  • 600 views
Posted on May 20, 2013 at 15:39

Hi all,

I have a DSP function and I want to know how many MIPS does it consume.

I have used SYSTICK of STM32F2xx device (max frequency 120 MHz) to measure the number of cycles required and now I want  to convert to MIPS?

As an example, if I measure 15000 cycles and the device is running @ 120MHz. How many MIPS does it mean?

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    1 reply

    Tesla DeLorean
    Tesla DeLorean
    Guru
    May 20, 2013
    Posted on May 20, 2013 at 16:11

    A simpler solution might be to use DWT_CYCCNT to measure cycles that specific code sequences take.

    1 cycle would indicate 120 MOPS (million operations per second)

    120 cycles would indicate 1 MOPS throughput

    15000 cycles would indicate 8000 OPS

    ie mops = 120 / cycles

    You'd need to look at the code to make a determination about how many instructions are executed. Things like loads, stores, division will take more than a single cycle.

    If ''MIPS'' is a benchmark number and correlates to a different machine, or architecture, you'll need to analyze that benchmark code and understand the fudge factor for the ''unit'' of work.
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