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Have to use performance Monitors (for bench Marking) on Hardware?

Ranjith Kumar
Note: This was originally posted on 11th May 2009 at http://forums.arm.com

Hi all,

   I want to do benchmark my application in ARM Cortex A8. For that one i have downloaded some bench mark code using performance monitors from ARM website (see below link) .

[url="http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka4237.html"]http://infocenter.arm.com/help/index.jsp?t...aqs/ka4237.html[/url]

  Basing on the procedure provided in the above link i am bench marking my code in Cortex A8 using ISSM but it is giving zero... Even if i Used RTSM also it is giving very less value i.e., 0.8 MIPS... but same appication if i run on ARM Work bench profiller it is giving 28 MIPS...

  Is performance counters i have to use in Hardware or what?

  Please help me to do benchmarking a function with out using profilling but using performance monitors or other way?

            Thanks in Advance.

Regards,
Ranjith Kumar,
satyaranjith@gmail.com,
(09008787862)
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  • Arm Employee Badge
    Note: This was originally posted on 11th May 2009 at http://forums.arm.com

    Are you sure you are actually measuring MIPS?

    MIPS = millions of instructions per second.

    So a typical 800 MHz Cortex-A8 could theoretically be 1600 MIPS (it dual issues) assuming "perfect" code. MIPS figures are often normalized "MIPS per MHz" - so in the perfect case the Cortex-A8 will be 2 MIPS per MHz.

    As I have mentioned before RTSM is *not* a performance model - so don't expect a realistic benchmark directly from RTSM.

    The profiler should be able to give you fairly good results - but my personal opinion is that hardware is always the best way to get results because it provides the memory related side-effects which models often struggle to give.
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  • Arm Employee Badge
    Note: This was originally posted on 11th May 2009 at http://forums.arm.com

    Are you sure you are actually measuring MIPS?

    MIPS = millions of instructions per second.

    So a typical 800 MHz Cortex-A8 could theoretically be 1600 MIPS (it dual issues) assuming "perfect" code. MIPS figures are often normalized "MIPS per MHz" - so in the perfect case the Cortex-A8 will be 2 MIPS per MHz.

    As I have mentioned before RTSM is *not* a performance model - so don't expect a realistic benchmark directly from RTSM.

    The profiler should be able to give you fairly good results - but my personal opinion is that hardware is always the best way to get results because it provides the memory related side-effects which models often struggle to give.
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