Hi guys,
I have instrumented my code on Nehalem with libpfm4 and now I am a little
bit confused.
I am reading Intel's "IA64-Optimization-Reference". In Appendix B3.4 they
describe a drill-down technique for performance analysis. I think this is a
good starting point for analysis.
Basically I want to map Intel's description in the document to the events of
libpfm4. This sounds easy... but it is not that easy for me :-)
Intel writes for example:
"Cycles_non_retiring_uops .... A constant issue rate of μops flowing through
the issue port. Thus, we define:
uops_rate = Dispatch_uops/Cycles_issuing_uops, where Dispatch_uops can be
measured with RS_UOPS_DISPATCHED, clearing the INV bit and the CMASK."
Well, I don't see a RS_UOPS_DISPATCHED event in libpfm. As far as I
understood the architecture, UOPS_DISPATCHED can be expressed as the sum of
UOPS_RETIRED and UOPS_ISSUED.
What do you think?
Regards, Eduard
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