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Ask the Wizard Questions

PCA and optimized code

The Question is:

What are the effects of using compiler optimization
(mixed C and Fortran code) on the Performance and
Coverage Analyzer (PCA)?

When compiling with full optimization, PCA reports no
data points in defined buckets, and the buckets it does
define are not routines from my code. Help says to use
no optimization when gathering coverage information,
but I'm gathering CPU sampling and stack pcs. Is it
possible to use a lower level of optimization with PCA?
I'm trying to get an idea of optimization's effect on the
performance of my code.

Thanks alot for any help,

The Answer is:

It would be pointless to require unoptimized code for PCA, a
performance analyzer!  PCA is perfectly capable of analyzing optimized
code, though doing statement-level analysis, especially on Alpha, may
be confusing due to the way code gets shifted around.