I'm confused and checked several online dicts for the term "to instrument" ...and still not sure what you're saying ...

Do you mean that the profiler before 5.10 wasn't able to hook into BEGIN blocks but only ordinary subs and that the performance impact is a side effect of this measurement itself?

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

In reply to Re^2: Performance and Behavioral changes in Perl 5.8.8 and Perl 5.10.1 by LanX
in thread Performance and Behavioral changes in Perl 5.8.8 and Perl 5.10.1 by ManasMarwah

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