Dear Stéphane,
stephane eranian a écrit :
> Vincent,
>
> Hugh is right!
> Be careful than on Core i7, micro-ops are counted not instructions.
OK.
> Other users have also reported variations in the number of
> micro-ops reported for the same instruction. It depends on
> the floating point values passed and whether or not they
> reach the limit of their types (e.g., denormals).
OK, I modify the module accordingly to what Hugh said and it seems to be
quite OK (at least "enough" for a first prototype):
MXM:
Measured : Perf : 4.818 [GFLOPS]
Computed : Perf : 4.383 [GFLOPS]
MXV:
Measured : Perf : 1.329 [GFLOPS]
Computed : Perf : 1.172 [GFLOPS]
(the regular 10 % can be easily used as a correction)
> As for PFM_NHM_SEL_ANYTHR, it is not mandatory at all.
> In fact you probably don't want to use it. If you run pfmon
> on all logical cores (without --cpu-list), then you can compute
> total FLOPS by adding up each per-cpu counts. Alternatively
> you can use the --aggr option to have pfmon do it for you.
Heum, maybe my first post was not clear, sorry for that. I don't use the
"pfmon" tool. I implemented what I needed. My goal is to be able to
measure all the FLOP's (actual) on each (physical) core of a processor,
regardless of the application/thread/process which is running on. It is
why I thought I had to precise the PFM_NHM_SEL_ANYTHR flag in the
structure. Maybe I must have a look in the pfmon source code ?
Thanks again for your help
Cheers :)
Vince
--
---------------------------------------------------
Dr. Vincent KELLER
Fraunhofer-Institut für Algorithmen
und Wissenschaftliches Rechnen SCAI
http://scai.fraunhofer.de
ADDRESS: Schloss Birlinghoven
D - 53754 Sankt Augustin
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PHONE : + 49 (0) 2241/14-2280
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E-MAIL : vincent.kel...@scai-extern.fraunhofer.de
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