Hi!
Maybe it's simpler do link against libfloat.a (i.e.: using -msoft-float
instead of -mhard-float) and count calls to it?
M.
On Mon, 2008-01-28 at 10:21 -0800, Ian Ollmann wrote:
> On Jan 28, 2008, at 9:31 AM, Michal Kaszczuk wrote:
>
> > Hi!
> >
> > Is there any way to find out (measure or calculate) how many
> > floating-point operations is performed by given process?
>
> If you look in the Advanced config pane for shark on Intel Core 2,
> you'll see that you can set it up to record based on the Performance
> Monitor Counters. PMC1 has event 199 (SIMD_INST_RETIRED). There
> appears to be a mask you can set to look at packed single, scalar
> single, packed double, or scalar double. There are probably other PMC
> events like that.
>
> I don't know if Shark is really the right method to measure end-to-end
> floating point ops, although it can do it. (Set it up to trigger every
> 10,000 events then count the number of samples and multiply by 10,000
> for a rough estimate.) It would probably be more flexible to use the
> CHUD.framework.
>
> Note that performance monitor counters are often poorly documented and
> sometimes don't quite measure what you think they are measuring. Its
> probably a good idea to run some controls and make sure things add up
> to what you think they are going to add up to. You may be able to find
> additional information in documentation for other performance utils
> like perfmon2 and Appendices of the Shark documentation.
>
> http://developer.apple.com/documentation/DeveloperTools/Conceptual/SharkUserGuide/IntelCore2PMCTablesAppendix/chapter_953_section_1.html
>
> Ian
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