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.
Ian
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