Alexey,
Well, AFAIK, PAPI abstracts away the platform dependencies quite
well, so I guess your code can be run straightforward on all IA-32
platforms (depending on the events you wish to measure, which may
or may not be present on all platforms). PowerPC, Itanium, Mips,
Alpha should work as well, IIRC. If the GHC backend can generate
code there, that is.
As the code stands now, data cache misses can be measured in a
platform independent way. For branch mispredictions, I am using
Opteron specific counters for reasons I no longer remember. Maybe I
couldn't find platform independent counters in PAPI for branch
misprediction.
Hmm, I think they should be there, IIRC. Anyway, it seems quite cool
that you're doing that.
Have you published anything about that?
We are on the process of writing such a paper right now. My wish is
to have the related code submitted to the head as soon as
possible :). But at the moment we still have to tweak and clean up
our optimisations a bit more.
Nice. Would you mind letting me know when you submitted something ...
I'm quite interested.
I should get around to start a wiki page about using PAPI these
days, but meanwhile feel free to contact me if you need further
information or help.
I've been toying with this idea for a while [4], but never had the
time to do something with it. If you have some cool stuff, let us
know. I'm very interested.
The code in the head will allow you to get numbers for the Mutator
and the GC separately. Also, I have hacked nofib-analyse so you can
compare CPU statistics among different runs of the nofib suite.
This is not committed yet, I guess it will make its way to the PAPI
wiki page once it's up. I will let you know when I bring the page up.
Great, thanks!
-- Andy
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